qi wireless charging led lantern reference design

2020 Microchip Technology Inc. DS50002992A

Qi Wireless Charging LED Lantern Reference Design

DS50002992A-page 2 2020 Microchip Technology Inc.

Information contained in this publication regarding deviceapplications and the like is provided only for your convenienceand may be superseded by updates. It is your responsibility toensure that your application meets with your specifications.MICROCHIP MAKES NO REPRESENTATIONS ORWARRANTIES OF ANY KIND WHETHER EXPRESS ORIMPLIED, WRITTEN OR ORAL, STATUTORY OROTHERWISE, RELATED TO THE INFORMATION,INCLUDING BUT NOT LIMITED TO ITS CONDITION,QUALITY, PERFORMANCE, MERCHANTABILITY ORFITNESS FOR PURPOSE. Microchip disclaims all liabilityarising from this information and its use. Use of Microchipdevices in life support and/or safety applications is entirely atthe buyer’s risk, and the buyer agrees to defend, indemnify andhold harmless Microchip from any and all damages, claims,suits, or expenses resulting from such use. No licenses areconveyed, implicitly or otherwise, under any Microchipintellectual property rights unless otherwise stated.

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SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.The Adaptec logo, Frequency on Demand, Silicon Storage Technology, and Symmcom are registered trademarks of Microchip Technology Inc. in other countries.GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. All other trademarks mentioned herein are property of their respective companies.

© 2020, Microchip Technology Incorporated, All Rights Reserved.

ISBN: 978-1-5224-6093-0For information regarding Microchip’s Quality Management Systems, please visit www.microchip.com/quality.

www.microchip.com/quality

www.microchip.com/quality

QI WIRELESS CHARGING LED LANTERN

REFERENCE DESIGN Table of Contents

Chapter 1. Product Overview1.1 Introduction ..................................................................................................... 51.2 Qi Wireless Charging LED Lantern Reference Design Overview .................. 5

1.2.1 Device Overview ........................................................................................ 51.2.2 What is the Qi Wireless Charging LED Lantern Reference Design? ........... 5

1.3 What the Qi Wireless Charging LED Lantern Kit Contains ............................ 5Chapter 2. Installation and Operation

2.1 Introduction ..................................................................................................... 72.1.1 Qi Wireless Charging LED Lantern Key Features ....................................... 72.1.2 Qi Wireless Charging LED Lantern Reference Design Features ................ 7

2.2 Getting Started ............................................................................................... 82.2.1 Setup and Testing ....................................................................................... 82.2.2 How the Qi Wireless Charging LED Lantern Reference Design works ....... 92.2.3 Firmware Description ................................................................................. 10

Appendix A. Schematics and LayoutsA.1 Introduction .................................................................................................. 11A.2 Board – Schematic ....................................................................................... 12A.3 Board – Top Silk .......................................................................................... 13A.4 Board – Top Copper and Silk ....................................................................... 13A.5 Board – Top Copper .................................................................................... 14A.6 Board – Bottom Copper ............................................................................... 14A.7 Board – Bottom Copper and Silk ................................................................. 15A.8 Board – Bottom Silk ..................................................................................... 15

Appendix B. Bill of Materials (BOM)Worldwide Sales and Service .................................................................................... 19

2020 Microchip Technology Inc. DS50002992A-page 3


NOTES:



REFERENCE DESIGN

Chapter 1. Product Overview

1.1 INTRODUCTIONThis chapter provides an overview of the Qi Wireless Charging LED Lantern Reference Design and covers the following topics:• Qi Wireless Charging LED Lantern Reference Design Short Overview• What is the Qi Wireless Charging LED Lantern Reference Design?• Qi Wireless Charging LED Lantern Reference Design Kit Contents

1.2 QI WIRELESS CHARGING LED LANTERN REFERENCE DESIGN OVERVIEW

1.2.1 Device OverviewThe Microchip Qi Wireless Charging LED Lantern is a Qi 1.1 standard (5W maximum power) compatible receiver. It provides a flexible, low-cost alternative to the common wireless charging solutions by using a general purpose 8-bit microcontroller for communication and charging.The Microchip Qi Wireless Charging LED Lantern can be used in conjunction with any Qi 1.1 - compatible wireless charging transmitters. It has the added functionality of a fully featured Lithium-Ion charging controller and the high efficiency of a switching power supply.

1.2.2 What is the Qi Wireless Charging LED Lantern Reference Design?

The Qi Wireless Charging LED Lantern Reference Design is a portable and flexible lighting solution which can be charged wirelessly. The design demonstrates features of a Qi 1.1 compatible wireless receiver which opens the possibility of encapsulating the end solution, making it dust and waterproof.A synchronous, bidirectional buck or boost converter is used in order to obtain high effi-ciency and to implement the battery charging algorithm and the LED driving functions. A full charging algorithm for Lithium-Ion batteries is implemented in the microcontrol-ler's firmware, providing safe charging.The lantern’s lighting intensity can be selected with the help of a button, having four dimming levels. A 14-pin PIC16F18325 microcontroller is used to implement all the functions on the board (Qi communication protocol, buck and boost regulation's con-trol, battery charging algorithm, LED dimming).

1.3 WHAT THE QI WIRELESS CHARGING LED LANTERN KIT CONTAINSThe Qi Wireless Charging LED Lantern Reference Design kit includes:• Qi Wireless Charging LED Lantern Reference Design LED Board• Important Information Sheet



NOTES:



REFERENCE DESIGNChapter 2. Installation and Operation

2.1 INTRODUCTION

2.1.1 Qi Wireless Charging LED Lantern Key Features The Microchip Qi Wireless Charging LED Lantern is developed to offer a flexible, low-cost alternative demo solution to the already existing wireless charging products.The key features of the Microchip Qi Wireless Charging LED Lantern that allow the users to quickly add accessible wireless charging functionality to other applications are:• Receiver implementation using a general purpose 8-bit microcontroller• Compatibility with the Qi 1.1 (5W) standard, allowing the receiver to be used with

any Qi 1.1 compatible wireless charging transmitters• Accurate power measurement to aid the Foreign Object Detection (FOD) function

2.1.2 Qi Wireless Charging LED Lantern Reference Design Features The Qi Wireless Charging LED Lantern Reference Design is developed to demonstrate a Qi 1.1 receiver implementation coupled with a bidirectional switching power supply that enables battery charging and LED driving. The board demonstrates how to implement a Qi 1.1 wireless receiver, charge a Lithium-Ion battery from a receiver and boost the battery voltage to drive a string of LEDs, using a PIC16F18325 microcontroller and a number of analog components.

FIGURE 2-1: Qi Wireless Charging LED Lantern Reference Design Simplified Block Diagram.



The Qi Wireless Charging LED Lantern Reference Design has the following features:• Input voltage from wireless receiver coil: +4.5V to +28V• Low voltage power: +5V (using a MCP1804 LDO) • Qi 1.1 5W Wireless Charger communication protocol implemented in microcon-

troller's firmware• Designed to use 2000 mAh Li-Ion battery (charging 1A at 4.2V)• 3 LEDs string (200 mA max. driving current at 9V) • Synchronous buck converter topology, leading to high efficiency• Bidirectional buck or boost converter, driven by a PFM signal, providing charging

and discharging modes, buck mode in order to charge the battery and boost mode to supply the LED string from the battery

• Full charging algorithm for Lithium-Ion batteries implemented in firmware• Four dimming levels for LEDs: 25%, 50%, 75% and 100%

2.2 GETTING STARTEDThe Qi Wireless Charging LED Lantern Reference Design is fully assembled and tested to evaluate and demonstrate the Microchip Qi Wireless Charging LED Lantern product.

2.2.1 Setup and Testing

2.2.1.1 SETTING UP THE BOARD

Take the following steps to use the device:• A battery that meets the requirements in Note 1 must be attached to the

designated connector• Power on the board by placing the lateral switch (SW2) in the ON position• To charge the battery connected to the board:

- Make sure the lantern function is OFF (LEDs are turned OFF)- Place the board on the wireless charger to charge the battery- Wait until the LEDs start flashing, indicating full charge

• To use the lantern function: - Push the SW1 button to turn on the light - Choose the dimming level by pressing the button repeatedly until the desired

level is selected

2.2.1.2 BOARD TESTING

The best way to evaluate the Qi Wireless Charging Lantern is to examine the circuit and measure the voltages and currents with a digital voltage meter and probe the board with an oscilloscope.The coil voltage and battery voltage can be measured directly or on voltage dividers. The battery current can be measured at the output of the MCP6001 operational amplifier or on the battery shunt resistor (R12). The current through LEDs can be measured on dedicated shunt resistor(R5).

Note 1: A Li-Ion battery with a 2 pin connector and a capacity of around 2000 mAh is needed for the board to function correctly. The circuit needs to be powered by the battery to start communicating with and charging from the wireless charging station. For testing purposes, a HobbyKing® 9067000191-0 Li-Ion battery is used.


Installation and Operation

FIGURE 2-2: Qi Wireless Charging LED Lantern Reference Design Setup Circuit.

2.2.2 How the Qi Wireless Charging LED Lantern Reference Design works

The Qi charger incorporates the Qi 1.1 standard for wireless power transfer, making it a portable device. It brings the advantage of not needing any connector for charging, making the device easy to encapsulate so it can be made waterproof.A synchronous buck converter is used to charge the Lithium-Ion (Li-Ion) battery. The input voltage is provided by the Qi charger. A complex charging algorithm is implemented in the firmware. The algorithm incorporates the precharge state, constant current and constant voltage stages until one of the End-of-Charge conditions is reached (minimum current, flat current or timeout). The battery is considered charged when it reaches 4.2V and the charging current drops below 200 mA. The Lithium-Ion battery current is measured using the MCP6001 low-power operational amplifier.The DC converter is bidirectional and its regulation loop is controlled by the PIC microcontroller. The power train is driven by a MCP14628 MOSFET Power Driver. When the lantern needs to be powered, the PFM signal polarity is inverted. The MCP14628 driver is set to forced continuous conduction mode (CCM) and the converter turns into a boost mode which supplies the LEDs. The maximum current through the LEDs is set to 200 mA.Four programmable levels of intensity are provided for the LEDs. The level is selected by pressing the button. Modifying the level is complete by changing the current reference. An 8-bit microcontroller, PIC16F18325, is used to select and control the charge/dis-charge modes, measure the battery voltage and current, enable the current through LEDs during discharge and select the current reference for the desired dimming level.The MCP1804 Low-Dropout Regulator (LDO) is used to supply with +5V the PIC16F18325 microcontroller, the MCP14628 MOSFET driver and the MCP6001 low-power operational amplifier.



2.2.3 Firmware DescriptionThe firmware provides complete control over the Qi wireless charger, Lithium-Ion charging algorithm and LEDs power management.In buck mode, the circuit charges the Lithium-Ion battery with the power received from the Qi charger. This is complete by software through two PI control loops which monitor and regulate the battery's current and voltage. Also, the voltage on the coil and the cur-rent though LEDs are measured by using the ADC module of the PIC microcontroller. The charging algorithm for the battery incorporates the precharge; charge and the ter-mination conditions of the current being less than 200 mA; the overtime condition; and the current plateau condition. The LEDs control is complete by the software enabling the battery supply through a boost converter and monitoring the current through the LEDs to be maximum 200 mA at the highest setting.The bidirectional buck or boost converter is controlled by the PIC microcontroller with the Numerically Controlled Oscillator (NCO) in Pulse Frequency (PF) mode. It provides a fixed pulse of 2 µs and the frequency is varied. The maximum possible frequency is 500 kHz, corresponding to a duty cycle of 100%. The actual limit is set depending on the buck or boost mode.

FIGURE 2-3: Simplified Firmware Flowchart.

SW2 ON

LED OFF?

Change dimmingLED 100%, 75%, 50%, 25%, OFF

SW1 PRESSED

Vin > Vcharge

YESYES

Qi Communication

Charge Battery

YESYES

NONO

YESYES

SW2 OFF

FROM ANYWHEREFROM ANYWHERE

NONO



REFERENCE DESIGNAppendix A. Schematics and Layouts

A.1 INTRODUCTIONThis appendix contains the following schematics and layouts for the Qi Wireless Charging LED Lantern Reference Design:• Board – Schematic• Board – Top Silk• Board – Top Copper and Silk• Board – Top Copper• Board – Bottom Copper• Board – Bottom Copper and Silk• Board – Bottom Silk


Schematics and Layouts

2020 M

icrochip Technology Inc.D

S50002992A-page 12

A.

Qi Lantern Wireless BatteryProject Title

Designed with

Drawn By:Mihnea Rosu

Sheet Title

Qi Lantern Wireless Battery

Engineer:Mihnea Rosu

INT01115PartNumber: Variant: [No Variations]

VDD1

RA52

RA43

RA3/MCLR/VPP4

RC55

RC46

RC37

RC28

RC19

RC010

RA211

RA1/ICSPCLK12

RA0/ICSPDAT13

VSS14

PIC16F18325

IC1+5V

VIN_DIVVBAT_DIV

ILEDPGC/DATA_MODDAC_OUT/PGD

MCLR/BUTIN_SWLED_SW

FCCMPIC_BSTPIC_PFMIBAT

0.1uF25V0603

C20

T

10k06031%

R4

20k06031%

R2

VBAT

F

3

ILED

VBAT_DIV

+A3

-A4

OUTA1

VSS

2

VDD

5

+A

-A

OUTA

VSS

VDD

A

S

D

MCP6001U2

0.05RR12

GND

+5V

GND

1k

R10

1k

R7

1k

R6

GND

10000pFC19

GND

IBAT

GND

GND GND

BATTERY

1000pF50V0603

C1

+5V

GND

0.1uF25V0603

C28

12

J5

31

2

25336NA

SW2

3.7V Li-Poly

BAT1

2 BOARD – SCHEMATIC

DAC_OUT/PGDPGC/DATA_MOD

+5V

HIGHDR1

BO

OT

2

PWM3

GN

D4

LOWDR5

VC

C6

FC

CM

7

PHASE8

MCP14628IC2

1uF25V0603

C22

DRV_VDD

PIC_PFM

PHASE

100k06031%

R17DRV_VDD

FCCM

LO_DRV

HI_DRV1N4148

D7

VIN +5V VBAT

VIN1

GND2

SHDN4

NC3

VOUT5

MCP1804/5V

U1

0.1uF50V0805

C21

0.1uF50V0603

C25

8uHL1

15uH

L2

3

1

2

Q53

1

2

Q6

1uF25V0603

C23

10uF25V0603

C240.1uF25V0603

C26

DRV_VDD

0.1uF25V0603

C27

PIC_BST

PGC/DATA_MODPGC/DATA_MOD

0.1uF50V 1206C3

0.1uF50V 1206C4

0.047uF50V0805

C160.047uF50V0805

C17

10uF50V1206

C510uF50V1206

C6

VIN_RECT

41,

2,3

5,6,7

,8

NTMS4177PR2GQ2

10k06031%

R9

3

1

2

Q4IN_SW

10uF50V1206

C710uF50V1206

C810uF50V1206

C910uF50V1206

C10

VIN

110k06031%

R8

10k06031%

R11

8

2

17 ,

SI4804CDY-T1-GE3Q3A

5

4

36 ,

SI4804CDY-T1-GE3Q3B

HI_DRV

LO_DRV10uF50V1206

C1210uF50V1206

C1310uF50V1206

C1410uF50V1206

C15

VBA

1R08051%

R5

1k06031%

R3

27p50V060

C2

VIN_DIV

12

J2

1 2J3

DRV_VDD

GND

GND

GND GND

GNDGNDGND

GND

GND

GNDGND

GNDGND

GND

3

1

2

2N7002-7-FQ1

GND

GND GND GND GND GND GND

GND

MCLR/BUT

+5V

PMEG3030EP

D1

PM

EG

30

30

EP

D3

PMEG3030EP

D4PMEG3030EPD2

1000pF50V0603

C18

10k06031%

R1

5600pF50V0805

C11

PHASE

LED_SW

TACT SPST

SW1

123456

HDR-2.54 Male 1x6

J1

TP1

GND

GND

TP4

TP5

MCLR/BUT

5.1VD6

123

BAV99D5


A.3 BOARD – TOP SILK

A.4 BOARD – TOP COPPER AND SILK



A.5 BOARD – TOP COPPER

A.6 BOARD – BOTTOM COPPER



A.7 BOARD – BOTTOM COPPER AND SILK

A.8 BOARD – BOTTOM SILK



NOTES:



REFERENCE DESIGN

Appendix B. Bill of Materials (BOM)

TABLE B-1: BILL OF MATERIALS (BOM)Qty. Reference Description Manufacturer Part Number2 C1, C18 Capacitor, ceramic,1000 pF, 50V,

20%, X7R, SMD, 0603TDK Corporation C1608X7R2A102K080AA

1 C2 Capacitor, ceramic, 27 pF, 50V, 5%, NP0, SMD, 0603

KEMET C0603C270J5GACTU

2 C3, C4 Capacitor, ceramic, 0.1 µF, 50V, 10%, X7R, SMD, 1206

Murata Electronics® GRM42-6X7R104K050BL

10 C5, C6, C7, C8, C9, C10, C12, C13, C14, C15

Capacitor, ceramic, 10 µF, 50V, 10%, X5R, SMD, 1206

Wurth Electronik 885012108022

1 C11 Capacitor, ceramic, 5600 pF, 50V, 5%, NP0, SMD, 0805

KEMET C0805C562J5GACTU

2 C16, C17 Capacitor, ceramic, 0.047 µF, 50V, 10%, X7R, SMD, 0805

KEMET C0805C473K5RACTU

1 C19 Capacitor, ceramic, 10000 pF, 50V, 10%, X7R, SMD, 0603

Kyocera AVX® 06035C103KAT2A\4K

4 C20, C26, C27, C28

Capacitor, ceramic, 0.1 µF, 25V, 20%, X7R, SMD, 0603

KEMET C0603C104M3RACTU

1 C21 Capacitor, ceramic, 0.1 µF, 50V, 10%, X7R, SMD, 0805

Kyocera AVX 08055C104KAT2A

2 C22,C23 Capacitor, ceramic, 1 µF, 25V, 10%, X7R, SMD, 0603

TDK Corporation CGA3E1X7R1E105K080AC

1 C24 Capacitor, ceramic,10 µF, 25V, 20%, X5R, SMD, 0603

Murata Electronics GRM188R61E106MA73D

1 C25 Capacitor, ceramic, 0.1 µF, 50V, 10%, X7R, SMD, 0603

Yageo Corporation CC0603KRX7R9BB104

4 D1,D2,D3,D4 Diode SCTKY PMEG3030EP,115, 30V, 3A, SMD, SOD-128

Nexperia PMEG3030EP,115

1 D5 Diode RECT ARRAY BAV99, 1.25V, 200 mA, 70V, SOT-23-3

Micro Commercial Components Corporation®

BAV99-TP

1 D6 Diode NR MMSZ4689ET1G, 5.1V, 500mW, SMD, SOD-123

ON Semiconductor® MMSZ4689ET1G

1 D7 Diode RECT 1N4148 1.25V, 150 mA, 100V, SOD-123

Micro Commercial Components Corporation

1N4148W-TP

1 J1 Connector HDR-2.54, Male, 1x6 Tin, 5.84 MH, TH, VERT

Sullins Connector Solutions

PEC06SAAN

Note: The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM used in manufacturing uses all RoHS-compliant components.



2 J2,J3 Connector HDR-2.54, Male, 1x2, Gold, 5.84 MH, TH, VERT


1 J5 Connector HDR-2.0, Male, 1X2, SHROUDED B2B-PH-K-S(LF)(SN), TH, VERT

JST B2B-PH-K-S(LF)(SN)

1 L1 Inductor, 8 µH, 5A, 10%, L40W40H1.2, Wireless Power Charging Reciever Coil


1 L2 Inductor, 15 µH, 2.2A, 15%, SMD, 7.3x7.3x4.5


1 Q1 Transistor FET, N-CH, 2N7002-7-F, 60V, 170 mA, 370 mW, SOT-23-3

NXP Semiconductors 2N7002-7-F

1 Q2 Transistor FET, P-CH, NTMS4177PR2G, 30V, 6.6A, 0.012R, 0.84W, SOIC-8

ON Semiconductor NTMS4177PR2G

1 Q3 Transistor FET DUAL, N+N, SI4804CDY-T1-GE3, 30V, 8A, 0.022R, 3.1W, SOIC-8

Vishay Siliconix SI4804CDY-T1-GE3

4 Q4, Q5, Q6 Transistor FET, N-CH, 2N7002P,215, 60V, 360 mA, 350 mW, SOT-23-3

Nexperia USA 2N7002P,215

4 R1, R4, R9,R11

Resistor, TKF, 10k, 1%, 1/10W, SMD, 0603

Panasonic® - ECG ERJ-3GEYJ132V

1 R2 Resistor, TKF, 100k, 1%, 1/10W, SMD, 0603

Panasonic - ECG 5-1879337-9

4 R3, R6, R7,R10

Resistor, TKF, 1k, 1%, 1/10W, SMD, 0603

Panasonic - ECG ERJ-3EKF8201V

1 R5 Resistor, TKF, 1R, 1%, 1/8W, SMD, 0805



Vishay Dale ERJ-3EKF2001V

1 R12 Resistor, MS, 0.05R, 1%, 1W, SMD, 1206

TE Connectivity, Ltd. ERJ-3EKF3301V



1 SW1 Switch, TACT, SPST, 12V, 50 mA, EVQ-P7A01P SMD

Panasonic - ECG ERJ-6BWFR025V

1 SW2 Switch, SLIDE, SPDT, 1A, 30VDC, RA, TH

APEM CRCW0603470KFKEA

1 TP1 CON TP LOOP Black TH Keystone Electronic ERJ-3EKF5902VIC1 Microchip, MCU, 8-BIT, 32 MHz,

14kB, 1K, PIC16F18325-I/SL SOIC-14

Microchip Technology Inc. PIC16F18325-I/SL

IC2 Microchip Analog FET Driver, Sin-gle-Non-Inverting, MCP14628-E/SN SOIC-8

Microchip Technology Inc. MCP14628T-E/SN

1 U1 Microchip Analog LDO 5V MCP1804T-5002I/OT SOT-23-5

Microchip Technology Inc. MCP1804T-5002I/OT

1 U2 Microchip Analog OPAMP 1-Ch 1MHz MCP6001T-E/OT SOT-23-5

Microchip Technology Inc. MCP6001T-E/OT

TABLE B-1: BILL OF MATERIALS (BOM) (CONTINUED)Qty. Reference Description Manufacturer Part Number

Note: The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM used in manufacturing uses all RoHS-compliant components.



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02/28/20

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