sam d21e / sam d21g / sam d21j - microchip...

32-bit ARM-BasedMicrocontrollers

SAM D21E / SAM D21G / SAM D21J

Introduction

The SAM D21 is a series of low-power microcontrollers using the 32-bit ARM Cortex-M0+ processor,and ranging from 32- to 64-pins with up to 256KB Flash and 32KB of SRAM. The SAM D21 operate at amaximum frequency of 48MHz and reach 2.46 CoreMark/MHz. They are designed for simple andintuitive migration with identical peripheral modules, hex compatible code, identical linear address mapand pin compatible migration paths between all devices in the product series. All devices includeintelligent and flexible peripherals, Event System for inter-peripheral signaling, and support for capacitivetouch button, slider and wheel user interfaces.

Features

Processor ARM Cortex-M0+ CPU running at up to 48MHz

Single-cycle hardware multiplier Micro Trace Buffer (MTB)

Memories 32/64/128/256KB in-system self-programmable Flash 4/8/16/32KB SRAM Memory

System Power-on reset (POR) and brown-out detection (BOD) Internal and external clock options with 48MHz Digital Frequency Locked Loop (DFLL48M)

and 48MHz to 96MHz Fractional Digital Phase Locked Loop (FDPLL96M) External Interrupt Controller (EIC) 16 external interrupts One non-maskable interrupt Two-pin Serial Wire Debug (SWD) programming, test and debugging interface

Low Power Idle and standby sleep modes SleepWalking peripherals

Peripherals 12-channel Direct Memory Access Controller (DMAC) 12-channel Event System Up to five 16-bit Timer/Counters (TC), configurable as either:

One 16-bit TC with two compare/capture channels One 8-bit TC with two compare/capture channels One 32-bit TC with two compare/capture channels, by using two TCs

Three 24-bit Timer/Counters for Control (TCC), with extended functions:

2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 1

Up to four compare channels with optional complementary output Generation of synchronized pulse width modulation (PWM) pattern across port pins Deterministic fault protection, fast decay and configurable dead-time between

complementary output Dithering that increase resolution with up to 5 bit and reduce quantization error

32-bit Real Time Counter (RTC) with clock/calendar function Watchdog Timer (WDT) CRC-32 generator One full-speed (12Mbps) Universal Serial Bus (USB) 2.0 interface

Embedded host and device function Eight endpoints

Up to six Serial Communication Interfaces (SERCOM), each configurable to operate as either: USART with full-duplex and single-wire half-duplex configuration I2C up to 3.4MHz SPI LIN slave

One two-channel Inter-IC Sound (I2S) interface One 12-bit, 350ksps Analog-to-Digital Converter (ADC) with up to 20 channels

Differential and single-ended input 1/2x to 16x programmable gain stage Automatic offset and gain error compensation Oversampling and decimation in hardware to support 13-, 14-, 15- or 16-bit resolution

10-bit, 350ksps Digital-to-Analog Converter (DAC) Two Analog Comparators (AC) with window compare function Peripheral Touch Controller (PTC)

256-Channel capacitive touch and proximity sensing I/O

Up to 52 programmable I/O pins Drop in compatible with SAM D20 Packages

64-pin TQFP, QFN, UFBGA 48-pin TQFP, QFN, WLCSP 32-pin TQFP, QFN, WLCSP

Operating Voltage 1.62V 3.63V

32-bit ARM-Based Microcontrollers


Table of Contents

Introduction......................................................................................................................1

Features.......................................................................................................................... 1

1. Description...............................................................................................................12

2. Configuration Summary...........................................................................................13

3. Ordering Information................................................................................................153.1. SAM D21E..................................................................................................................................153.2. SAM D21G................................................................................................................................. 183.3. SAM D21J.................................................................................................................................. 203.4. Device Identification................................................................................................................... 22

4. Block Diagram......................................................................................................... 24

5. Pinout...................................................................................................................... 255.1. SAM D21J.................................................................................................................................. 255.2. SAM D21G................................................................................................................................. 275.3. SAM D21E..................................................................................................................................29

6. Signal Descriptions List........................................................................................... 31

7. I/O Multiplexing and Considerations........................................................................337.1. Multiplexed Signals.................................................................................................................... 337.2. Other Functions..........................................................................................................................35

8. Power Supply and Start-Up Considerations............................................................ 388.1. Power Domain Overview............................................................................................................388.2. Power Supply Considerations.................................................................................................... 388.3. Power-Up................................................................................................................................... 408.4. Power-On Reset and Brown-Out Detector.................................................................................40

9. Product Mapping..................................................................................................... 42

10. Memories.................................................................................................................4310.1. Embedded Memories................................................................................................................. 4310.2. Physical Memory Map................................................................................................................4310.3. NVM Calibration and Auxiliary Space........................................................................................ 44

11. Processor And Architecture.....................................................................................4811.1. Cortex M0+ Processor............................................................................................................... 4811.2. Nested Vector Interrupt Controller..............................................................................................4911.3. Micro Trace Buffer......................................................................................................................5111.4. High-Speed Bus System............................................................................................................ 5211.5. AHB-APB Bridge........................................................................................................................ 54


11.6. PAC - Peripheral Access Controller........................................................................................... 55

12. Peripherals Configuration Summary........................................................................67

13. DSU - Device Service Unit...................................................................................... 6913.1. Overview.................................................................................................................................... 6913.2. Features..................................................................................................................................... 6913.3. Block Diagram............................................................................................................................7013.4. Signal Description...................................................................................................................... 7013.5. Product Dependencies...............................................................................................................7013.6. Debug Operation........................................................................................................................7113.7. Chip Erase..................................................................................................................................7313.8. Programming..............................................................................................................................7313.9. Intellectual Property Protection.................................................................................................. 7413.10. Device Identification...................................................................................................................7513.11. Functional Description................................................................................................................7613.12. Register Summary..................................................................................................................... 8213.13. Register Description...................................................................................................................84

14. Clock System.........................................................................................................10014.1. Clock Distribution..................................................................................................................... 10014.2. Synchronous and Asynchronous Clocks..................................................................................10114.3. Register Synchronization......................................................................................................... 10114.4. Enabling a Peripheral...............................................................................................................10614.5. Disabling a Peripheral.............................................................................................................. 10614.6. On-demand, Clock Requests................................................................................................... 10614.7. Power Consumption vs. Speed................................................................................................10714.8. Clocks after Reset....................................................................................................................107

15. GCLK - Generic Clock Controller.......................................................................... 10815.1. Overview.................................................................................................................................. 10815.2. Features................................................................................................................................... 10815.3. Block Diagram..........................................................................................................................10815.4. Signal Description.................................................................................................................... 10915.5. Product Dependencies.............................................................................................................10915.6. Functional Description.............................................................................................................. 11015.7. Register Summary....................................................................................................................11515.8. Register Description................................................................................................................. 116

16. PM Power Manager............................................................................................12716.1. Overview.................................................................................................................................. 12716.2. Features................................................................................................................................... 12716.3. Block Diagram..........................................................................................................................12816.4. Signal Description.................................................................................................................... 12816.5. Product Dependencies.............................................................................................................12816.6. Functional Description..............................................................................................................13016.7. Register Summary....................................................................................................................13716.8. Register Description.................................................................................................................137



17. SYSCTRL System Controller............................................................................. 15017.1. Overview.................................................................................................................................. 15017.2. Features................................................................................................................................... 15017.3. Block Diagram..........................................................................................................................15217.4. Signal Description.................................................................................................................... 15217.5. Product Dependencies.............................................................................................................15217.6. Functional Description..............................................................................................................15417.7. Register Summary....................................................................................................................17017.8. Register Description.................................................................................................................172

18. WDT Watchdog Timer........................................................................................ 20518.1. Overview.................................................................................................................................. 20518.2. Features................................................................................................................................... 20518.3. Block Diagram..........................................................................................................................20618.4. Signal Description.................................................................................................................... 20618.5. Product Dependencies.............................................................................................................20618.6. Functional Description..............................................................................................................20718.7. Register Summary....................................................................................................................21218.8. Register Description.................................................................................................................212

19. RTC Real-Time Counter.....................................................................................21819.1. Overview.................................................................................................................................. 21819.2. Features................................................................................................................................... 21819.3. Block Diagram..........................................................................................................................21919.4. Signal Description.................................................................................................................... 21919.5. Product Dependencies.............................................................................................................21919.6. Functional Description..............................................................................................................22119.7. Register Summary....................................................................................................................22619.8. Register Description.................................................................................................................229

20. DMAC Direct Memory Access Controller........................................................... 25220.1. Overview.................................................................................................................................. 25220.2. Features................................................................................................................................... 25220.3. Block Diagram..........................................................................................................................25420.4. Signal Description.................................................................................................................... 25420.5. Product Dependencies.............................................................................................................25420.6. Functional Description..............................................................................................................25520.7. Register Summary....................................................................................................................27520.8. Register Description.................................................................................................................27620.9. Register Summary - SRAM......................................................................................................29920.10. Register Description - SRAM................................................................................................... 299

21. EIC External Interrupt Controller........................................................................ 30521.1. Overview.................................................................................................................................. 30521.2. Features................................................................................................................................... 30521.3. Block Diagram..........................................................................................................................30521.4. Signal Description.................................................................................................................... 30621.5. Product Dependencies.............................................................................................................306



21.6. Functional Description..............................................................................................................30721.7. Register Summary....................................................................................................................31121.8. Register Description.................................................................................................................312

22. NVMCTRL Non-Volatile Memory Controller....................................................... 32022.1. Overview.................................................................................................................................. 32022.2. Features................................................................................................................................... 32022.3. Block Diagram..........................................................................................................................32022.4. Signal Description.................................................................................................................... 32122.5. Product Dependencies.............................................................................................................32122.6. Functional Description..............................................................................................................32222.7. Register Summary....................................................................................................................32922.8. Register Description.................................................................................................................329

23. PORT - I/O Pin Controller......................................................................................33923.1. Overview.................................................................................................................................. 33923.2. Features................................................................................................................................... 33923.3. Block Diagram..........................................................................................................................34023.4. Signal Description.................................................................................................................... 34023.5. Product Dependencies.............................................................................................................34023.6. Functional Description..............................................................................................................34223.7. Register Summary....................................................................................................................34823.8. Register Description.................................................................................................................350

24. EVSYS Event System........................................................................................ 36324.1. Overview.................................................................................................................................. 36324.2. Features................................................................................................................................... 36324.3. Block Diagram..........................................................................................................................36324.4. Signal Description.................................................................................................................... 36424.5. Product Dependencies.............................................................................................................36424.6. Functional Description..............................................................................................................36524.7. Register Summary....................................................................................................................37024.8. Register Description.................................................................................................................370

25. SERCOM Serial Communication Interface.........................................................38225.1. Overview.................................................................................................................................. 38225.2. Features................................................................................................................................... 38225.3. Block Diagram..........................................................................................................................38325.4. Signal Description.................................................................................................................... 38325.5. Product Dependencies.............................................................................................................38325.6. Functional Description..............................................................................................................385

26. SERCOM USART SERCOM Universal Synchronous and Asynchronous Receiverand Transmitter......................................................................................................39126.1. Overview.................................................................................................................................. 39126.2. USART Features...................................................................................................................... 39126.3. Block Diagram..........................................................................................................................39226.4. Signal Description.................................................................................................................... 392



26.5. Product Dependencies.............................................................................................................39226.6. Functional Description..............................................................................................................39426.7. Register Summary....................................................................................................................40626.8. Register Description.................................................................................................................406

27. SERCOM SPI SERCOM Serial Peripheral Interface..........................................42327.1. Overview.................................................................................................................................. 42327.2. Features................................................................................................................................... 42327.3. Block Diagram..........................................................................................................................42427.4. Signal Description.................................................................................................................... 42427.5. Product Dependencies.............................................................................................................42427.6. Functional Description..............................................................................................................42627.7. Register Summary....................................................................................................................43527.8. Register Description.................................................................................................................436

28. SERCOM I2C SERCOM Inter-Integrated Circuit................................................ 44928.1. Overview.................................................................................................................................. 44928.2. Features................................................................................................................................... 44928.3. Block Diagram..........................................................................................................................45028.4. Signal Description.................................................................................................................... 45028.5. Product Dependencies.............................................................................................................45028.6. Functional Description..............................................................................................................45228.7. Register Summary - I2C Slave.................................................................................................47128.8. Register Description - I2C Slave...............................................................................................47128.9. Register Summary - I2C Master...............................................................................................48528.10. Register Description - I2C Master............................................................................................ 486

29. I2S - Inter-IC Sound Controller..............................................................................50129.1. Overview.................................................................................................................................. 50129.2. Features................................................................................................................................... 50129.3. Block Diagram..........................................................................................................................50229.4. Signal Description.................................................................................................................... 50329.5. Product Dependencies.............................................................................................................50329.6. Functional Description..............................................................................................................50529.7. I2S Application Examples......................................................................................................... 51629.8. Register Summary....................................................................................................................51929.9. Register Description.................................................................................................................520

30. TC Timer/Counter...............................................................................................53330.1. Overview.................................................................................................................................. 53330.2. Features................................................................................................................................... 53330.3. Block Diagram..........................................................................................................................53430.4. Signal Description.................................................................................................................... 53430.5. Product Dependencies.............................................................................................................53530.6. Functional Description..............................................................................................................53630.7. Register Summary....................................................................................................................54830.8. Register Description.................................................................................................................550

31. TCC Timer/Counter for Control Applications...................................................... 565



31.1. Overview.................................................................................................................................. 56531.2. Features................................................................................................................................... 56531.3. Block Diagram..........................................................................................................................56631.4. Signal Description.................................................................................................................... 56631.5. Product Dependencies.............................................................................................................56731.6. Functional Description..............................................................................................................56831.7. Register Summary....................................................................................................................60131.8. Register Description.................................................................................................................603

32. USB Universal Serial Bus...................................................................................63832.1. Overview.................................................................................................................................. 63832.2. Features................................................................................................................................... 63832.3. USB Block Diagram..................................................................................................................63932.4. Signal Description.................................................................................................................... 63932.5. Product Dependencies.............................................................................................................63932.6. Functional Description..............................................................................................................64132.7. Register Summary....................................................................................................................65932.8. Register Description.................................................................................................................663

33. ADC Analog-to-Digital Converter........................................................................71433.1. Overview.................................................................................................................................. 71433.2. Features................................................................................................................................... 71433.3. Block Diagram..........................................................................................................................71533.4. Signal Description.................................................................................................................... 71533.5. Product Dependencies.............................................................................................................71633.6. Functional Description..............................................................................................................71733.7. Register Summary....................................................................................................................72633.8. Register Description.................................................................................................................727

34. AC Analog Comparators.....................................................................................74434.1. Overview.................................................................................................................................. 74434.2. Features................................................................................................................................... 74434.3. Block Diagram..........................................................................................................................74534.4. Signal Description.................................................................................................................... 74534.5. Product Dependencies.............................................................................................................74534.6. Functional Description..............................................................................................................74734.7. Register Summary....................................................................................................................75734.8. Register Description.................................................................................................................757

35. DAC Digital-to-Analog Converter........................................................................76835.1. Overview.................................................................................................................................. 76835.2. Features................................................................................................................................... 76835.3. Block Diagram..........................................................................................................................76835.4. Signal Description.................................................................................................................... 76835.5. Product Dependencies.............................................................................................................76835.6. Functional Description..............................................................................................................77035.7. Register Summary....................................................................................................................77435.8. Register Description.................................................................................................................774



36. PTC - Peripheral Touch Controller.........................................................................78136.1. Overview.................................................................................................................................. 78136.2. Features................................................................................................................................... 78136.3. Block Diagram..........................................................................................................................78236.4. Signal Description.................................................................................................................... 78336.5. Product Dependencies.............................................................................................................78336.6. Functional Description..............................................................................................................784

37. Electrical Characteristics....................................................................................... 78637.1. Disclaimer.................................................................................................................................78637.2. Absolute Maximum Ratings......................................................................................................78637.3. General Operating Ratings.......................................................................................................78637.4. Supply Characteristics..............................................................................................................78737.5. Maximum Clock Frequencies...................................................................................................78837.6. Power Consumption.................................................................................................................78937.7. Peripheral Power Consumption................................................................................................79537.8. I/O Pin Characteristics..............................................................................................................79837.9. Injection Current.......................................................................................................................80037.10. Analog Characteristics............................................................................................................. 80137.11. NVM Characteristics.................................................................................................................81637.12. Oscillators Characteristics........................................................................................................81737.13. PTC Typical Characteristics.....................................................................................................82537.14. USB Characteristics.................................................................................................................83137.15. Timing Characteristics..............................................................................................................832

38. Packaging Information...........................................................................................84238.1. Thermal Considerations........................................................................................................... 84238.2. Package Drawings................................................................................................................... 84338.3. Soldering Profile.......................................................................................................................854

39. Schematic Checklist.............................................................................................. 85539.1. Introduction...............................................................................................................................85539.2. Power Supply........................................................................................................................... 85539.3. External Analog Reference Connections................................................................................. 85639.4. External Reset Circuit...............................................................................................................85839.5. Clocks and Crystal Oscillators..................................................................................................85939.6. Unused or Unconnected Pins...................................................................................................86239.7. Programming and Debug Ports................................................................................................86239.8. USB Interface...........................................................................................................................865

40. Errata.....................................................................................................................86740.1. Device Variant A.......................................................................................................................86740.2. Device Variant B.......................................................................................................................90040.3. Device Variant C.......................................................................................................................908

41. Conventions...........................................................................................................91241.1. Numerical Notation...................................................................................................................91241.2. Memory Size and Type.............................................................................................................912



41.3. Frequency and Time.................................................................................................................91241.4. Registers and Bits.................................................................................................................... 913

42. Acronyms and Abbreviations.................................................................................914

43. Datasheet Revision History................................................................................... 91743.1. Rev. A 01/2017......................................................................................................................91743.2. Rev. O 12/2016..................................................................................................................... 91743.3. Rev. N 10/2016......................................................................................................................91843.4. Rev. M 09/2016..................................................................................................................... 91843.5. Rev. L 09/2016...................................................................................................................... 91843.6. Rev. K 09/2016......................................................................................................................91943.7. Rev. J 07/2016...................................................................................................................... 92043.8. Rev. I 03/2016....................................................................................................................... 92043.9. Rev. H 01/2016......................................................................................................................92143.10. Rev. G 09/2015..................................................................................................................... 92243.11. Rev. F 07/2015...................................................................................................................... 92343.12. Rev. E 02/2015......................................................................................................................92443.13. Rev. D 09/2014..................................................................................................................... 92543.14. Rev. C 07/2014..................................................................................................................... 92643.15. Rev. B 07/2014......................................................................................................................92643.16. Rev. A - 02/2014...................................................................................................................... 932

44. Appendix A. Electrical Characteristics at 125C....................................................93344.1. Disclaimer.................................................................................................................................93344.2. Absolute Maximum Ratings......................................................................................................93344.3. General Operating Ratings.......................................................................................................93444.4. Maximum Clock Frequencies...................................................................................................93444.5. Power Consumption.................................................................................................................93744.6. Analog Characteristics............................................................................................................. 94144.7. NVM Characteristics.................................................................................................................95344.8. Oscillators Characteristics........................................................................................................95444.9. Timing Characteristics..............................................................................................................963

The Microchip Web Site.............................................................................................. 968

Customer Change Notification Service........................................................................968

Customer Support....................................................................................................... 968

Product Identification System......................................................................................968

Microchip Devices Code Protection Feature............................................................... 969

Legal Notice.................................................................................................................970

Trademarks................................................................................................................. 970

Quality Management System Certified by DNV...........................................................971



Worldwide Sales and Service......................................................................................972



1. DescriptionThe SAM D21 is a series of low-power microcontrollers using the 32-bit ARM Cortex-M0+ processor,and ranging from 32- to 64-pins with up to 256KB Flash and 32KB of SRAM. The SAM D21 operate at amaximum frequency of 48MHz and reach 2.46 CoreMark/MHz. They are designed for simple and intuitivemigration with identical peripheral modules, hex compatible code, identical linear address map and pincompatible migration paths between all devices in the product series. All devices include intelligent andflexible peripherals, Event System for inter-peripheral signaling, and support for capacitive touch button,slider and wheel user interfaces.

The SAM D21 provide the following features: In-system programmable Flash, twelve-channel directmemory access (DMA) controller, 12 channel Event System, programmable interrupt controller, up to 52programmable I/O pins, 32-bit real-time clock and calendar, up to five 16-bit Timer/Counters (TC) andthree 24-bit Timer/Counters for Control (TCC), where each TC can be configured to perform frequencyand waveform generation, accurate program execution timing or input capture with time and frequencymeasurement of digital signals. The TCs can operate in 8- or 16-bit mode, selected TCs can be cascadedto form a 32-bit TC, and three timer/counters have extended functions optimized for motor, lighting andother control applications. The series provide one full-speed USB 2.0 embedded host and deviceinterface; up to six Serial Communication Modules (SERCOM) that each can be configured to act as anUSART, UART, SPI, I2C up to 3.4MHz, SMBus, PMBus, and LIN slave; two-channel I2S interface; up totwenty-channel 350ksps 12-bit ADC with programmable gain and optional oversampling and decimationsupporting up to 16-bit resolution, one 10-bit 350ksps DAC, two analog comparators with window mode,Peripheral Touch Controller supporting up to 256 buttons, sliders, wheels and proximity sensing;programmable Watchdog Timer, brown-out detector and power-on reset and two-pin Serial Wire Debug(SWD) program and debug interface.

All devices have accurate and low-power external and internal oscillators. All oscillators can be used as asource for the system clock. Different clock domains can be independently configured to run at differentfrequencies, enabling power saving by running each peripheral at its optimal clock frequency, and thusmaintaining a high CPU frequency while reducing power consumption.

The SAM D21 have two software-selectable sleep modes, idle and standby. In idle mode the CPU isstopped while all other functions can be kept running. In standby all clocks and functions are stoppedexpect those selected to continue running. The device supports SleepWalking. This feature allows theperipheral to wake up from sleep based on predefined conditions, and thus allows the CPU to wake uponly when needed, e.g. when a threshold is crossed or a result is ready. The Event System supportssynchronous and asynchronous events, allowing peripherals to receive, react to and send events even instandby mode.

The Flash program memory can be reprogrammed in-system through the SWD interface. The sameinterface can be used for non-intrusive on-chip debug of application code. A boot loader running in thedevice can use any communication interface to download and upgrade the application program in theFlash memory.

The SAM D21 microcontrollers are supported with a full suite of program and system development tools,including C compilers, macro assemblers, program debugger/simulators, programmers and evaluationkits.



2. Configuration SummarySAM D21J SAM D21G SAM D21E

Pins 64 48 (45 for WLCSP) 32 (35 for WLCSP)

General Purpose I/O-pins(GPIOs)

52 38 26

Flash 256/128/64/32KB 256/128/64/32KB 256/128/64/32KB

SRAM 32/16/8/4KB 32/16/8/4KB 32/16/8/4KB

Timer Counter (TC)instances

5 3 (5 for WLCSP) 3

Waveform output channelsper TC instance

2 2 2

Timer Counter for Control(TCC) instances

3 3 3

Waveform output channelsper TCC

8/4/2 8/4/2 6/4/2

DMA channels 12 12 12

USB interface 1 1 1

Serial CommunicationInterface (SERCOM)instances

6 6 4

Inter-IC Sound (I2S)interface

1 1 1

Analog-to-Digital Converter(ADC) channels

20 14 10

Analog Comparators (AC) 2 2 2

Digital-to-Analog Converter(DAC) channels

1 1 1

Real-Time Counter (RTC) Yes Yes Yes

RTC alarms 1 1 1

RTC compare values One 32-bit value or

two 16-bit values

One 32-bit value or

two 16-bit values

One 32-bit value or

two 16-bit values

External Interrupt lines 16 16 16

Peripheral Touch Controller(PTC) X and Y lines

16x16 12x10 10x6

Maximum CPU frequency 48MHz



SAM D21J SAM D21G SAM D21E

Packages QFN

TQFP

UFBGA

QFN

TQFP

WLCSP

QFN

TQFP

WLCSP

Oscillators 32.768kHz crystal oscillator (XOSC32K)

0.4-32MHz crystal oscillator (XOSC)

32.768kHz internal oscillator (OSC32K)

32KHz ultra-low-power internal oscillator (OSCULP32K)

8MHz high-accuracy internal oscillator (OSC8M)

48MHz Digital Frequency Locked Loop (DFLL48M)

96MHz Fractional Digital Phased Locked Loop (FDPLL96M)

Event System channels 12 12 12

SW Debug Interface Yes Yes Yes

Watchdog Timer (WDT) Yes Yes Yes



3. Ordering Information SAMD 21 E 15 A - M U T

Product FamilySAMD = General Purpose Microcontroller

21 = Cortex M0 + CPU, Basic Feature Set

E = 32 Pins (35 Pins for WLCSP)G = 48 Pins (45 Pins for WLCSP)J = 64 Pins

No character = Tray (Default) T = Tape and Reel

U = -40 - 85OC Matte Sn PlatingF = -40 - 125OC Matte Sn Plating

A = TQFPM = QFN U = WLCSPC = UFBGA

+ DMA + USB

Product Series

Flash Memory Density

Device VariantA = Default VariantB = Added RWW support for 32KB and 64KB memory optionsC = Silicon revision F for WLCSP35 package option.

Pin Count

Package Carrier

Package Grade

18 = 256KB17 = 128KB16 = 64KB15 = 32KB

Package Type

3.1 SAM D21ETable 3-1.Device Variant A

Ordering Code FLASH (bytes) SRAM (bytes) Package Carrier Type

ATSAMD21E15A-AU 32K 4K TQFP32 Tray

ATSAMD21E15A-AUT Tape & Reel

ATSAMD21E15A-AF Tray

ATSAMD21E15A-AFT Tape & Reel

ATSAMD21E15A-MU QFN32 Tray

ATSAMD21E15A-MUT Tape & Reel

ATSAMD21E15A-MF Tray

ATSAMD21E15A-MFT Tape & Reel



Table 3-2.Device Variant B


ATSAMD21E15B-AU 32K 4K TQFP32 Tray

ATSAMD21E15B-AUT Tape & Reel

ATSAMD21E15B-AF Tray

ATSAMD21E15B-AFT Tape & Reel

ATSAMD21E15B-MU QFN32 Tray

ATSAMD21E15B-MUT Tape & Reel

ATSAMD21E15B-MF Tray

ATSAMD21E15B-MFT Tape & Reel

ATSAMD21E15B-UUT WLCSP35 (GJR) Tape & Reel

ATSAMD21E16B-AU 64K 8K TQFP32 Tray

ATSAMD21E16B-AUT Tape & Reel

ATSAMD21E16B-AF Tray

ATSAMD21E16B-AFT Tape & Reel

ATSAMD21E16B-MU QFN32 Tray

ATSAMD21E16B-MUT Tape & Reel

ATSAMD21E16B-MF Tray

ATSAMD21E16B-MFT Tape & Reel

ATSAMD21E16B-UUT 64K 8K WLCSP35 (GJR) Tape & Reel

Table 3-3.Device Variant C


ATSAMD21E15C-UUT 32K 4K WLCSP35 (GJS) Tape & Reel

ATSAMD21E16C-UUT 64K 8K WLCSP35 (GJS) Tape & Reel



3.2 SAM D21GTable 3-4.Device Variant A


ATSAMD21G15A-AU 32K 4K TQFP48 Tray

ATSAMD21G15A-AUT Tape & Reel

ATSAMD21G15A-AF Tray

ATSAMD21G15A-AFT Tape & Reel

ATSAMD21G15A-MU QFN48 Tray

ATSAMD21G15A-MUT Tape & Reel

ATSAMD21G15A-MF Tray

ATSAMD21G15A-MFT Tape & Reel

















ATSAMD21G17A-UUT WLCSP45 Tape & Reel












ATSAMD21G18A-UUT WLCSP45 Tape & Reel



ATSAMD21G15B-AU 32K 4K TQFP48 Tray

ATSAMD21G15B-AUT Tape & Reel

ATSAMD21G15B-AF Tray

ATSAMD21G15B-AFT Tape & Reel

ATSAMD21G15B-MU QFN48 Tray

ATSAMD21G15B-MUT Tape & Reel

ATSAMD21G15B-MF Tray

ATSAMD21G15B-MFT Tape & Reel

ATSAMD21G16B-AU 64K 8K TQFP48 Tray

ATSAMD21G16B-AUT Tape & Reel

ATSAMD21G16B-AF Tray

ATSAMD21G16B-AFT Tape & Reel

ATSAMD21G16B-MU QFN48 Tray

ATSAMD21G16B-MUT Tape & Reel

ATSAMD21G16B-MF Tray

ATSAMD21G16B-MFT Tape & Reel



3.3 SAM D21JTable 3-6.Device Variant A


ATSAMD21J15A-AU 32K 4K TQFP64 Tray

ATSAMD21J15A-AUT Tape & Reel

ATSAMD21J15A-AF Tray

ATSAMD21J15A-AFT Tape & Reel

ATSAMD21J15A-MU QFN64 Tray

ATSAMD21J15A-MUT Tape & Reel

ATSAMD21J15A-MF Tray

ATSAMD21J15A-MFT Tape & Reel









ATSAMD21J16A-CU UFBGA64 Tray

ATSAMD21J16A-CUT Tape & Reel


























ATSAMD21J15B-AU 32K 4K TQFP64 Tray

ATSAMD21J15B-AUT Tape & Reel

ATSAMD21J15B-AF Tray

ATSAMD21J15B-AFT Tape & Reel

ATSAMD21J15B-MU QFN64 Tray

ATSAMD21J15B-MUT Tape & Reel

ATSAMD21J15B-MF Tray

ATSAMD21J15B-MFT Tape & Reel

ATSAMD21J16B-AU 64K 8K TQFP64 Tray

ATSAMD21J16B-AUT Tape & Reel

ATSAMD21J16B-AF Tray

ATSAMD21J16B-AFT Tape & Reel

ATSAMD21J16B-MU QFN64 Tray

ATSAMD21J16B-MUT Tape & Reel

ATSAMD21J16B-MF Tray

ATSAMD21J16B-MFT Tape & Reel

ATSAMD21J16B-CU UFBGA64 Tray

ATSAMD21J16B-CUT Tape & Reel



3.4 Device IdentificationThe DSU - Device Service Unit peripheral provides the Device Selection bits in the Device Identificationregister (DID.DEVSEL) in order to identify the device by software. The SAM D21 variants have a resetvalue of DID=0x1001drxx, with the LSB identifying the die number ('d'), the die revision ('r') and thedevice selection ('xx').

Table 3-8.SAM D21 Device Identification Values

Device Variant DID.DEVSEL Device ID (DID)

SAMD21J18A 0x00 0x10010000

SAMD21J17A 0x01 0x10010001

SAMD21J16A 0x02 0x10010002

SAMD21J15A 0x03 0x10010003

Reserved 0x04

SAMD21G18A 0x05 0x10010005

SAMD21G17A 0x06 0x10010006

SAMD21G16A 0x07 0x10010007

SAMD21G15A 0x08 0x10010008

Reserved 0x09

SAMD21E18A 0x0A 0x1001000A

SAMD21E17A 0x0B 0x1001000B

SAMD21E16A 0x0C 0x1001000C

SAMD21E15A 0x0D 0x1001000D

Reserved 0x0E

SAMD21G18A (WLCSP) 0x0F 0x1001000F

SAMD21G17A (WLCSP) 0x10 0x10010010

Reserved 0x11 - 0x1F

SAMD21J16B 0x20 0x10011420 (die revision E)

0x10011520 (die revision F)

SAMD21J15B 0x21 0x10011421 (die revision E)


Reserved 0x22

SAMD21G16B 0x23 0x10011423 (die revision E)


SAMD21G15B 0x24 0x10011424 (die revision E)




Device Variant DID.DEVSEL Device ID (DID)

Reserved 0x25

SAMD21E16B 0x26 0x10011426 (die revision E)


SAMD21E15B 0x27 0x10011427 (die revision E)


Reserved 0x28-0x54

SAMD21E16B (WLCSP) 0x55 0x10011455 (die revision E)

SAMD21E15B (WLCSP) 0x56 0x10011456 (die revision E)

Reserved 0x57 - 0x61

SAMD21E16C (WLCSP) 0x62 0x10011562 (die revision F)

SAMD21E15C (WLCSP) 0x63 0x10011563 (die revision F)

Reserved 0x64-0xFF

Note: The device variant (last letter of the ordering number) is independent of the die revision(DSU.DID.REVISION): The device variant denotes functional differences, whereas the die revision marksevolution of the die. The device variant denotes functional differences, whereas the die revision marksevolution of the die.

Related LinksDID



4. Block Diagram

6 x SERCOM

8 x Timer Counter

REAL TIME COUNTER

AHB-APB BRIDGE C

M

MHIGH SPEED BUS MATRIX

POR

T

PO

RT

WATCHDOG TIMER

SERIAL WIRESWDIO

S

CORTEX-M0+ PROCESSOR Fmax 48 MHz

SWCLK

DEVICE SERVICE

UNIT

AHB-APB BRIDGE A

20-CHANNEL 12-bit ADC 350KSPS

AIN[19..0]

VREFA

AIN[3..0]

S

SRAM CONTROLLER

32/16/8/4KB RAM

M

RESET CONTROLLER

SLEEP CONTROLLER

CLOCK CONTROLLER

POWER MANAGER

RESETN

5 x TIMER / COUNTER

EVE

NT

SYST

EM

S

6 x SERCOM

2 ANALOG COMPARATORS

SYSTEM CONTROLLER

XOUT XIN

XOUT32 XIN32

OSCULP32K

OSC32K

OSC8M

DFLL48M

BOD33

XOSC32K

XOSC

VREF

X[15..0]

Y[15..0]

PERIPHERAL TOUCH

CONTROLLER

PERIPHERAL ACCESS CONTROLLER

AHB-APB BRIDGE B

VREFA

VOUT

10-bit DAC

EXTERNAL INTERRUPT CONTROLLER



EXTINT[15..0] NMI

GCLK_IO[7..0]

S

PAD0

WO1

PAD1PAD2PAD3

WO0

VREFB

256/128/64/32KB NVM

NVM CONTROLLER

Cache

S

DMA

USB FSDEVICE

MINI-HOST

DP

DM

3x TIMER / COUNTERFOR CONTROL

WOn

IOBUS

FDPLL96MDMA

DMA

DMA

DMA

DMA

MCK[1..0]SCK[1..0]INTER-IC

SOUND CONTROLLER

SD[1..0]FS[1..0]

DMA

MIC

RO

TRAC

E BU

FFER

SOF 1KHZ

WO0WO1

(2)

GENERIC CLOCKCONTROLLER

CMP[1..0]

1. Some products have different number of SERCOM instances, Timer/Counter instances, PTCsignals and ADC signals. Refer to the Configuration Summary for details.

2. The three TCC instances have different configurations, including the number of Waveform Output(WO) lines. Refer to the TCC Configuration for details.

Related LinksConfiguration SummaryTCC Configurations



5. Pinout

5.1 SAM D21J

5.1.1 QFN64 / TQFP64

PA00 1PA01 2PA02 3PA03 4PB04 5PB05 6

GNDANA 7VDDANA 8

PB06 9PB07 10PB08 11PB09 12PA04 13PA05 14PA06 15PA07 16

PA08

17PA

0918

PA10

19PA

1120

VDD

IO21

GN

D22

PB10

23PB

1124

PB12

25PB

1326

PB14

27PB

1528

PA12

29PA

1330

PA14

31PA

1532

VDDIO48GND47PA2546PA2445PA2344PA2243PA2142PA2041PB1740PB1639PA1938PA1837PA1736PA1635VDDIO34GND33

PB22

49PB

2350

PA27

51R

ESET

52PA

2853

GN

D54

VDD

CO

RE

55VD

DIN

56PA

3057

PA31

58PB

3059

PB31

60PB

0061

PB01

62PB

0263

PB03

64

DIGITAL PINANALOG PINOSCILLATORGROUNDINPUT SUPPLY REGULATED OUTPUT SUPPLYRESET PIN



5.1.2 UFBGA64



5.2 SAM D21G

5.2.1 QFN48 / TQFP48

PA21

PA00 1PA01 2PA02 3PA03 4

GNDANA 5VDDANA 6

PB08 7PB09 8PA04 9PA05 10PA06 11PA07 12

PA08

13PA

0914

PA10

15PA

1116

VDD

IO17

GN

D18

PB10

19PB

1120

PA12

21PA

1322

PA14

23PA

1524

VDDIO36GND35PA2534PA2433PA2332PA2231

30PA2029PA1928PA1827PA1726PA1625

PB22

37PB

2338

PA27

39R

ESET

40PA

2841

GN

D42

VDD

CO

RE

43VD

DIN

44PA

3045

PA31

46PB

0247

PB03

48

DIGITAL PINANALOG PINOSCILLATORGROUNDINPUT SUPPLYREGULATED OUTPUT SUPPLYRESET PIN



5.2.2 WLCSP45

A



5.3 SAM D21E

5.3.1 QFN32 / TQFP32

PA00 1PA01 2PA02 3PA03 4PA04 5PA05 6PA06 7PA07 8

VDD

ANA

9G

ND

10PA

0811

PA09

12PA

1013

PA11

14PA

1415

PA15

16

PA2524PA2423PA2322PA2221PA1920PA1819PA1718PA1617

PA27

25R

ESET

26PA

2827

GN

D28

VDD

CO

RE

29VD

DIN

30PA

3031

PA31

32

DIGITAL PINANALOG PINOSCILLATORGROUNDINPUT SUPPLYREGULATED OUTPUT SUPPLYRESET PIN



5.3.2 WLCSP35

PA00

PA01

GNDA

NA

VDDA

NA

PA06

VDDIO PA1

5

PA18

PA19

PA23

PA24

PA25

PA14

PA16

PA17

PA22

PA27

RESE

T

PA03

PA05

PA10

PA08

VDDIN

VDDC

ORE

PA02

PA04

PA07

PA31

PA30

PA11

PA09

PA28

GND

GND

GND

1

2

3

4

5

6

A B C D E F



6. Signal Descriptions ListThe following table gives details on signal names classified by peripheral.

Signal Name Function Type Active Level

Analog Comparators - AC

AIN[3:0] AC Analog Inputs Analog

CMP[:0] AC Comparator Outputs Digital

Analog Digital Converter - ADC

AIN[19:0] ADC Analog Inputs Analog

VREFA ADC Voltage External Reference A Analog

VREFB ADC Voltage External Reference B Analog

Digital Analog Converter - DAC

VOUT DAC Voltage output Analog

VREFA DAC Voltage External Reference Analog

External Interrupt Controller

EXTINT[15:0] External Interrupts Input

NMI External Non-Maskable Interrupt Input

Generic Clock Generator - GCLK

GCLK_IO[7:0] Generic Clock (source clock or generic clock generatoroutput)

I/O

Inter-IC Sound Controller - I2S

MCK[1:0] Master Clock I/O

SCK[1:0] Serial Clock I/O

FS[1:0] I2S Word Select or TDM Frame Sync I/O

SD[1:0] Serial Data Input or Output I/O

Power Manager - PM

RESETN Reset Input Low

Serial Communication Interface - SERCOMx

PAD[3:0] SERCOM I/O Pads I/O

System Control - SYSCTRL

XIN Crystal Input Analog/ Digital

XIN32 32kHz Crystal Input Analog/ Digital

XOUT Crystal Output Analog

XOUT32 32kHz Crystal Output Analog



Signal Name Function Type Active Level

Timer Counter - TCx

WO[1:0] Waveform Outputs Output

Timer Counter - TCCx

WO[1:0] Waveform Outputs Output

Peripheral Touch Controller - PTC

X[15:0] PTC Input Analog

Y[15:0] PTC Input Analog

General Purpose I/O - PORT

PA25 - PA00 Parallel I/O Controller I/O Port A I/O



PB17 - PB00 Parallel I/O Controller I/O Port B I/O



Universal Serial Bus - USB

DP DP for USB I/O

DM DM for USB I/O

SOF 1kHz USB Start of Frame I/O



7. I/O Multiplexing and Considerations

7.1 Multiplexed SignalsEach pin is by default controlled by the PORT as a general purpose I/O and alternatively it can beassigned to one of the peripheral functions A, B, C, D, E, F, G or H. To enable a peripheral function on apin, the Peripheral Multiplexer Enable bit in the Pin Configuration register corresponding to that pin(PINCFGn.PMUXEN, n = 0-31) in the PORT must be written to one. The selection of peripheral functionA to H is done by writing to the Peripheral Multiplexing Odd and Even bits in the Peripheral Multiplexingregister (PMUXn.PMUXE/O) in the PORT.

This table describes the peripheral signals multiplexed to the PORT I/O pins.

Table 7-1. PORT Function MultiplexingPin(1) I/O Pin Supply A B(2)(3) C D E F G H

SAMD21E SAMD21G SAMD21J EIC REF ADC AC PTC DAC SERCOM(2)(3) SERCOM-ALT TC(4)

/TCC

TCC COM AC/

GCLK

1 1 1 PA00 VDDANA EXTINT[0] SERCOM1/PAD[0]

TCC2/WO[0]

2 2 2 PA01 VDDANA EXTINT[1] SERCOM1/PAD[1]

TCC2/WO[1]

3 3 3 PA02 VDDANA EXTINT[2] AIN[0] Y[0] VOUT

4 4 4 PA03 VDDANA EXTINT[3] ADC/VREFADAC/

VREFA

AIN[1] Y[1]

5 PB04 VDDANA EXTINT[4] AIN[12] Y[10]




7 11 PB08 VDDANA EXTINT[8] AIN[2] Y[14] SERCOM4/PAD[0]

TC4/WO[0]


TC4/WO[1]

5 9 13 PA04 VDDANA EXTINT[4] ADC/VREFB

AIN[4] AIN[0] Y[2] SERCOM0/PAD[0]

TCC0/WO[0]

6 10 14 PA05 VDDANA EXTINT[5] AIN[5] AIN[1] Y[3] SERCOM0/PAD[1]

TCC0/WO[1]


TCC1/WO[0]


TCC1/WO[1] I2S/SD[0]

11 13 17 PA08 VDDIO NMI AIN[16] X[0] SERCOM0/PAD[0]

SERCOM2/PAD[0]

TCC0/WO[0] TCC1/WO[2]

I2S/SD[1]

12 14 18 PA09 VDDIO EXTINT[9] AIN[17] X[1] SERCOM0/PAD[1]

SERCOM2/PAD[1]


I2S/MCK[0]


SERCOM2/PAD[2]


I2S/SCK[0]

GCLK_IO[4]


SERCOM2/PAD[3]


I2S/FS[0] GCLK_IO[5]

19 23 PB10 VDDIO EXTINT[10] SERCOM4/PAD[2]

TC5/WO[0] TCC0/WO[4]

I2S/MCK[1]

GCLK_IO[4]



I2S/SCK[1]

GCLK_IO[5]

25 PB12 VDDIO EXTINT[12] X[12] SERCOM4/PAD[0]





GCLK_IO[7]


TC5/WO[0] GCLK_IO[0]



Pin(1) I/O Pin Supply A B(2)(3) C D E F G H

SAMD21E SAMD21G SAMD21J EIC REF ADC AC PTC DAC SERCOM(2)(3) SERCOM-ALT TC(4)

/TCC

TCC COM AC/

GCLK



21 29 PA12 VDDIO EXTINT[12] SERCOM2/PAD[0]

SERCOM4/PAD[0]


AC/CMP[0]

22 30 PA13 VDDIO EXTINT[13] SERCOM2/PAD[1]

SERCOM4/PAD[1]


AC/CMP[1]

15 23 31 PA14 VDDIO EXTINT[14] SERCOM2/PAD[2]

SERCOM4/PAD[2]


GCLK_IO[0]


SERCOM4/PAD[3]


GCLK_IO[1]

17 25 35 PA16 VDDIO EXTINT[0] X[4] SERCOM1/PAD[0]

SERCOM3/PAD[0]


GCLK_IO[2]


SERCOM3/PAD[1]


GCLK_IO[3]


SERCOM3/PAD[2]


AC/CMP[0]


SERCOM3/PAD[3]


I2S/SD[0] AC/CMP[1]

39 PB16 VDDIO EXTINT[0] SERCOM5/PAD[0]


I2S/SD[1] GCLK_IO[2]



I2S/MCK[0]

GCLK_IO[3]

29 41 PA20 VDDIO EXTINT[4] X[8] SERCOM5/PAD[2]

SERCOM3/PAD[2]


I2S/SCK[0]

GCLK_IO[4]

30 42 PA21 VDDIO EXTINT[5] X[9] SERCOM5/PAD[3]

SERCOM3/PAD[3]




SERCOM5/PAD[0]


GCLK_IO[6]


SERCOM5/PAD[1]


USB/SOF1kHz

GCLK_IO[7]

23 33 45 PA24(6) VDDIO EXTINT[12] SERCOM3/PAD[2]

SERCOM5/PAD[2]


USB/DM

24 34 46 PA25(6) VDDIO EXTINT[13] SERCOM3/PAD[3]

SERCOM5/PAD[3]


USB/DP





25 39 51 PA27 VDDIO EXTINT[15] GCLK_IO[0]

27 41 53 PA28 VDDIO EXTINT[8] GCLK_IO[0]


TCC1/WO[0] SWCLK GCLK_IO[0]


TCC1/WO[1] SWDIO(5)





61 PB00 VDDANA EXTINT[0] AIN[8] Y[6] SERCOM5/PAD[2]

TC7/WO[0]

62 PB01 VDDANA EXTINT[1] AIN[9] Y[7] SERCOM5/PAD[3]

TC7/WO[1]


TC6/WO[0]


TC6/WO[1]

1. Use the SAMD21J pinout muxing for WLCSP45 package.2. All analog pin functions are on peripheral function B. Peripheral function B must be selected to

disable the digital control of the pin.3. Only some pins can be used in SERCOM I2C mode. Refer to SERCOM I2C Pins.



4. Note that TC6 and TC7 are not supported on the SAM D21E and G devices. Refer to ConfigurationSummary for details.

5. This function is only activated in the presence of a debugger.6. If the PA24 and PA25 pins are not connected, it is recommended to enable a pull-up on PA24 and

PA25 through input GPIO mode. The aim is to avoid an eventually extract power consumption(

7.2.4 GPIO ClustersTable 7-5.GPIO Clusters

PACKAGE CLUSTER GPIO SUPPLIESPINSCONNECTEDTO THECLUSTER

64pins 1 PB31 PB30 PA31 PA30 VDDINpin56/GNDpin54

2 PA28 PA27 PB23 PB22 VDDINpin56/GNDpin54 andVDDIO pin48/GND pin47

3 PA25 PA24 PA23 PA22 PA21 PA20 PB17 PB16 PA19 PA18 PA17 PA16 VDDIO pin48/GND pin47and VDDIOpin34/GNDpin33

4 PA15 PA14 PA13 PA12 PB15 PB14 PB13 PB12 PB11 PB10 VDDIO pin34/GND pin33and VDDIOpin21/GNDpin22

5 PA11 PA10 PA09 PA08 VDDIOpin21/GNDpin22

6 PA07 PA06 PA05 PA04 PB09 PB08 PB07 PB06 VDDANA pin8/GNDANApin7

7 PB05 PB04 PA03 PA02 PA01 PA00 PB03 PB02 PB01 PB00 VDDANA pin8/GNDANApin7

48pins 1 PA31 PA30 VDDINpin44/GNDpin42

2 PA28 PA27 PB23 PB22 VDDINpin44/GNDpin42 andVDDIOpin36/GNDpin35

3 PA25 PA24 PA23 PA22 PA21 PA20 PA19 PA18 PA17 PA16 PA15 PA14 PA13 PA12 PB11 PB10 VDDIOpin36/GNDpin35 andVDDIOpin17/GNDpin18

4 PA11 PA10 PA09 PA08 VDDIOpin17/GNDpin18

5 PA07 PA06 PA05 PA04 PB09 PB08 VDDANA pin6/GNDANA pin5

6 PA03 PA02 PA01 PA00 PB03 PB02 VDDANA pin6/GNDANA pin5



PACKAGE CLUSTER GPIO SUPPLIESPINSCONNECTEDTO THECLUSTER

32pins 1 PA31 PA30 VDDINpin30/GND pin28

2 PA28 PA27 PA25 PA24 PA23 PA22 PA19 PA18 PA17 PA16 PA15 PA14 PA11 PA10 PA09 PA08 VDDINpin30/GND pin28 andVDDANApin9/GNDpin10

3 PA07 PA06 PA05 PA04 PA03 PA02 PA01 PA00 VDDANApin9/GNDpin10

7.2.5 TCC ConfigurationsThe SAM D21 has three instances of the Timer/Counter for Control applications (TCC) peripheral, ,TCC[2:0]. The following table lists the features for each TCC instance.

Table 7-6.TCC Configuration Summary

TCC# Channels(CC_NUM)

WaveformOutput

(WO_NUM)

Countersize

Fault Dithering Outputmatrix

Dead TimeInsertion

(DTI)

SWAP Patterngeneration

0 4 8 24-bit Yes Yes Yes Yes Yes Yes

1 2 4 24-bit Yes Yes Yes

2 2 2 16-bit Yes

Note: The number of CC registers (CC_NUM) for each TCC corresponds to the number of compare/capture channels, so that a TCC can have more Waveform Outputs (WO_NUM) than CC registers.



8. Power Supply and Start-Up Considerations

8.1 Power Domain Overview

VOLTAGEREGULATOR

VDD

IN

VDD

CO

RE

GN

DADC

AC

DAC

PTC

XOSC32K

OSC32K

VDD

ANA

GN

DAN

A

PA[7:2]

PB[9:0]

PA[1:0]

Digital Logic(CPU, peripherals)

DFLL48M

VDD

IO

OSC8M

XOSC

OSCULP32K

PA[31:16]

PB[31:10]

PA[15:14]

BOD33

POR

PA[13:8]BOD12

FDPLL96M

8.2 Power Supply Considerations

8.2.1 Power SuppliesThe device has several different power supply pins:

VDDIO: Powers I/O lines, OSC8M and XOSC. Voltage is 1.62V to 3.63V. VDDIN: Powers I/O lines and the internal regulator. Voltage is 1.62V to 3.63V. VDDANA: Powers I/O lines and the ADC, AC, DAC, PTC, OSCULP32K, OSC32K, XOSC32K.

Voltage is 1.62V to 3.63V. VDDCORE: Internal regulated voltage output. Powers the core, memories, peripherals, FDPLL96M,

and DFLL48M. Voltage is 1.2V.

The same voltage must be applied to both VDDIN, VDDIO and VDDANA. This common voltage isreferred to as VDD in the datasheet.

The ground pins, GND, are common to VDDCORE, VDDIO and VDDIN. The ground pin for VDDANA isGNDANA.



For decoupling recommendations for the different power supplies. Refer to Schematic Checklist fordetails.

Related LinksSchematic Checklist

8.2.2 Voltage RegulatorThe voltage regulator has two different modes:

Normal mode: To be used when the CPU and peripherals are running Low Power (LP) mode: To be used when the regulator draws small static current. It can be used in

standby mode

8.2.3 Typical Powering SchematicsThe device uses a single main supply with a range of 1.62V - 3.63V.

The following figure shows the recommended power supply connection.

Figure 8-1.Power Supply Connection

(1.62V 3.63V)Main Supply VDDIO

VDDANA

VDDIN

VDDCORE

GND

GNDANA

DEVICE

8.2.4 Power-Up Sequence

8.2.4.1 Minimum Rise RateThe integrated power-on reset (POR) circuitry monitoring the VDDANA power supply requires a minimumrise rate. Refer to the Electrical Characteristics for details.

Related LinksElectrical Characteristics

8.2.4.2 Maximum Rise RateThe rise rate of the power supply must not exceed the values described in Electrical Characteristics.Refer to the Electrical Characteristics for details.



Related LinksElectrical Characteristics

8.3 Power-UpThis section summarizes the power-up sequence of the device. The behavior after power-up is controlledby the Power Manager. Refer to PM Power Manager for details.

Related LinksPM Power Manager

8.3.1 Starting of ClocksAfter power-up, the device is set to its initial state and kept in reset, until the power has stabilizedthroughout the device. Once the power has stabilized, the device will use a 1MHz clock. This clock isderived from the 8MHz Internal Oscillator (OSC8M), which is divided by eight and used as a clock sourcefor generic clock generator 0. Generic clock generator 0 is the main clock for the Power Manager (PM).

Some synchronous system clocks are active, allowing software execution.

Refer to the Clock Mask Register section in PM Power Manager for the list of default peripheral clocksrunning. Synchronous system clocks that are running are by default not divided and receive a 1MHz clockthrough generic clock generator 0. Other generic clocks are disabled except GCLK_WDT, which is usedby the Watchdog Timer (WDT).

Related LinksPM Power Manager

8.3.2 I/O PinsAfter power-up, the I/O pins are tri-stated.

8.3.3 Fetching of Initial InstructionsAfter reset has been released, the CPU starts fetching PC and SP values from the reset address, whichis 0x00000000. This address points to the first executable address in the internal flash. The code readfrom the internal flash is free to configure the clock system and clock sources. Refer to PM PowerManager, GCLK Generic Clock Controller and SYSCTRL System Controller for details. Refer to theARM Architecture Reference Manual for more information on CPU startup (http://www.arm.com).

Related LinksPM Power ManagerSYSCTRL System ControllerClock System

8.4 Power-On Reset and Brown-Out DetectorThe SAM D21 embeds three features to monitor, warn and/or reset the device:

POR: Power-on reset on VDDA

sam d21e / sam d21g / sam d21j - microchip...

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