trf7960tb hf rfid reader module user's guide

TRF7960TB HF RFID Reader Module

User's Guide

Literature Number: SLOU297

October 2010

2 SLOU297–October 2010Submit Documentation Feedback

Copyright © 2010, Texas Instruments Incorporated

http://www.go-dsp.com/forms/techdoc/doc_feedback.htm?litnum=SLOU297

1 Purpose ............................................................................................................................. 52 Scope ................................................................................................................................ 53 References ......................................................................................................................... 54 TRF7960TB Module Description ............................................................................................ 65 TRF7960TB Connections/Technical Details ............................................................................ 76 TRF7960TB Module Schematic ............................................................................................. 97 MSP-EXP430F5438 Experimenters Board ............................................................................. 108 DK-LM3S9B96-EM2-TRF7960R ARM® Cortex™-M3 Development Board .................................. 129 Quick Start ....................................................................................................................... 1310 Base Application Firmware ................................................................................................. 1311 Platform Specific Details .................................................................................................... 1312 Mechanical/Physical Information ......................................................................................... 1413 Antenna Tuning Details ...................................................................................................... 1514 TRF7960TB Module Read Ranges ........................................................................................ 19

3SLOU297–October 2010 Table of ContentsSubmit Documentation Feedback



www.ti.com

List of Figures

1 TRF7960TB Evaluation Module........................................................................................... 6

2 TRF7960TB Module Schematic........................................................................................... 9

3 MSP-EXP430F5438 Development Board .............................................................................. 10

4 Debug Header (RF3) Logic Analyzer Connections for Monitoring SPI Communications BetweenMSP430F5438A and TRF796x on TRF7960TB Module ............................................................. 11

5 Firmware Development\Debug Setup for MSP-EXP430F5438 Experimenters Board ........................... 11

6 DK-LM3S9B96-EM2-TRF7960R Development Platform ............................................................. 12

7 Mechanical/Physical Information ........................................................................................ 14

8 Smith Chart Simulation (RPAR = 1.3 kΩ) ................................................................................ 16

9 Smith Chart Simulation (RPAR = 680 Ω) ................................................................................. 16

10 Theoretical Parallel Resistor Value for Desired Q .................................................................... 17

11 Theoretical Capacitance Values for Resonance at Desired Q ...................................................... 17

12 Higher Q Antenna Measurement Plots with Calculated Values (Q = ~20) ........................................ 18

13 Lower Q Antenna Measurement Plots with Calculated Values (Q = ~10) ......................................... 18

14 ISO15693 Transponder Read Ranges with TRF7960TB ............................................................ 19

15 ISO14443A Transponder Read Ranges with TRF7960TB .......................................................... 19

16 ISO14443B Transponder Read Ranges with TRF7960TB .......................................................... 19

List of Tables

1 Connector P1/RF1 .......................................................................................................... 7

2 Connector P2/RF2 .......................................................................................................... 8

4 List of Figures SLOU297–October 2010Submit Documentation Feedback



User's GuideSLOU297–October 2010

TRF7960TB HF RFID Reader Module

1 Purpose

This document provides direction for TRF796x users implementing a 13.56-MHz RFID reader solutionusing the TRF796x IC connected to a Texas Instruments embedded microcontroller or microprocessordevelopment platform. Examples of such development platforms are the MSP-EXP430F5438 board, theARM® Cortex™-M3 based DK-LM3S9B96 board, MAVRK™ Reference Kit, or any other TI embeddedmicrocontroller platform with the EM socket headers populated.

2 Scope

This document describes the TRF7960TB module as it relates to using the module for evaluation anddevelopment purposes in conjunction with Texas Instruments Embedded Development platforms. Thismanual does not cover the in-depth details of the TRF796x reader IC family, as those details aredocumented in the data sheets for those parts, along with application notes that can be found on theproduct pages (see hyperlinks in Section 3).

3 References• TRF7960 product page• TRF796x data sheet: SLOU186• TRF7960TB Schematic, BOM and Design files: SLOC221• MSP-EXP430F5438 Users Guide: SLAU263• LM3S9B96 DK Users Guide: SPMU036• TPS61222DCKT product page• TI ISO15693/ISO18000-3 Inlays/Tags Parametric Search• Samtec Header and Mate Information:

SFM Series OverviewTFM Series Overview

• Smith Chart Simulation Tool (licensed copy)

MAVRK, Stellaris are trademarks of Texas Instruments.StellarisWare is a registered trademark of Texas Instruments.Cortex is a trademark of ARM Ltd.ARM is a registered trademark of ARM Ltd.MIFARE is a trademark of NXP Semiconductors.All other trademarks are the property of their respective owners.

5SLOU297–October 2010 TRF7960TB HF RFID Reader ModuleSubmit Documentation Feedback


http://focus.ti.com/docs/prod/folders/print/trf7960.html

http://www.ti.com/lit/pdf/SLOU186

http://www.ti.com/lit/zip/sloc221

http://www.ti.com/lit/pdf/SLAU263

http://www.ti.com/lit/pdf/SPMU036

http://focus.ti.com/docs/prod/folders/print/tps61222.html

http://tinyurl.com/24yb947

https://www.samtec.com/ProductInformation/TechnicalSpecifications/Overview.aspx?series=SFM

https://www.samtec.com/ProductInformation/TechnicalSpecifications/Overview.aspx?series=TFM

http://www.fritz.dellsperger.net/


TRF7960TB Module Description www.ti.com

4 TRF7960TB Module Description

The TRF7960TB Evaluation Module (EVM) (see Figure 1) allows the software application developer tobecome familiar with the functionalities of TRF7960 Multi-Standard Fully Integrated 13.56-MHz RFIDreader IC with the freedom to develop on the Texas Instruments embedded microcontroller developmentplatform of choice.

The TRF7960TB module also allows customer-driven antenna tuning with onboard coil andcustomer-driven antenna form factor design.

The module is hardwired for SPI communications, supports slave select and TRF7960 Direct Mode 2(default), Direct Mode 1, and Direct Mode 0 operations. The user also has access to and full control overthe TRF7960 EN2 and EN lines, allowing for design and development of ultralow-power high-frequency(HF) RFID systems.

The module has an onboard boost converter (TPS61222DCKT) which boosts 3.3 VDC to 5 VDC out toTRF7960 IC for +23 dBm (full transmitter power out) operations.

An impedance-matching circuit from 4 Ω to 50 Ω is populated on the module, and this is connected to atuned 50-Ω antenna circuit that consists of an onboard four-turn coil with series and parallel passiveelements (capacitors and a resistor).

Test points are available on the board for checking firmware operations with oscilloscope or logicanalyzer, impedance matching, and for attaching an external antenna.

Connection to Texas Instruments microcontroller platforms are made via Samtec EM headers located onthe back of the board (connectors P1/RF1 and P2/RF2).

Figure 1. TRF7960TB Evaluation Module

6 TRF7960TB HF RFID Reader Module SLOU297–October 2010Submit Documentation Feedback


http://www.ti.com/lit/gpn/tps61222


www.ti.com TRF7960TB Connections/Technical Details

5 TRF7960TB Connections/Technical Details

Table 1 and Table 2 describe the signals for connector P1/RF1 and P2/RF2, respectively.

Table 1. Connector P1/RF1

Pin Signal Name DescriptionNo.

1 GND Ground

2 N/C No connection

3 MOD Direct mode, external modulation input

4 N/C No connection

5 N/C No connection

6 N/C No connection

7 IRQ Interrupt request (from TRF7960 to MCU)

8 N/C No connection

Clock for microcontroller (3.39 / 6.78 / 13.56 MHz) at EN = 1 and EN2 = don't care9 SYS_CLK

If EN = 0 and EN2 = 1, then system clock is set to 60 kHz

10 EN Chip enable input (If EN = 0, then chip is in power-down mode).

11 N/C No connection

Pulse enable and selection of power down mode. If EN2 is connected to VIN, then VDD_X is active12 EN2 during power down to support the microcontroller. Pin can also be used for pulse wake-up from

power-down mode.


14 SLAVE SELECT Slave select, I/O 4 (active low)


16 DATA_CLK Data clock input for microcontroller communication (from microcontroller)


18 MOSI I/O 7, master out/slave in (data in from microcontroller)

19 GND Ground

20 MISO I/O 6, master in/slave out (data out from TRF7960)




TRF7960TB Connections/Technical Details www.ti.com

Table 2. Connector P2/RF2

Pin Signal Name DescriptionNo.

1 N/C No connection

2 N/C No connection

3 N/C No connection

4 N/C No connection

5 N/C No connection

6 N/C No connection

7 +3.3VDC IN +VDC in (to TPS61222DCKT for generation of 5 VDC)

8 N/C No connection

9 +3.3VDC IN +VDC in (to TPS61222DCKT for generation of 5 VDC)









Direct mode, selection between ASK and OOK modulation (0 = ASK, 1 = OOK)18 ASK/OOK

Also can be configured to provide the received analog signal output (ANA_OUT).






Antenna Tuning Example

Tuning components will

change for different

inductance values

Fix

ed

+5

VD

C

ou

t

BG

VD

D

VD

D_

X

LD

VIN

+5

VD

C

GN

D

C2

11

00

pF

C2

11

00

pF

C2

82

pF

DN

I

C2

82

pF

DN

I

AN

T1

0.9

50

uH

AN

T1

0.9

50

uH

IN1

GN

D2

C2

0.0

1u

F

C2

0.0

1u

F

J1

CO

AX

IAL

TS

T_

PO

RT

J1

CO

AX

IAL

TS

T_

PO

RT

1

2

3

R1

10

kR

11

0k

C1

92

20

pF

C1

92

20

pF

TP

5G

ND

TP

5G

ND

R4

10

kR

41

0k

C1

315

00

pF

C1

315

00

pF

C2

51

0u

FC

25

10

uF

C4

0.0

1u

F

C4

0.0

1u

F

R3

10

kR

31

0k

C1

51

20

0p

FC

15

12

00

pF

C9

2.2

uF

C9

2.2

uF

C1

61

20

0p

FC

16

12

00

pF

TP

9M

OD

TP

9M

OD

C3

2.2

uF

C3

2.2

uF

C2

48

2p

FC

24

82

pF

R2

10

kR

21

0k

C8

0.0

1u

F

C8

0.0

1u

F

TP

2V

DD

_X

TP

2V

DD

_X

R5

0R

50

C1

12

7p

FC

11

27

pF

P2

SF

M-1

10

-02

-L-D

-AR

F2

P2

SF

M-1

10

-02

-L-D

-AR

F2

20

18

16

14

12

10

8642

19

17

15

13

1197531

C1

22

7p

FC

12

27

pF

C1

2.2

uF

C1

2.2

uF

TP

1+

5V

DC

TP

1+

5V

DC

TP

15

DA

TA

_C

LK

TP

15

DA

TA

_C

LK

L2

33

0n

H

L2

33

0n

H

OS

C1

13

.56

0M

Hz

OS

C1

13

.56

0M

Hz

GN

D2

GN

D4

XT

AL

23

XT

AL

11

C1

81

0p

FC

18

10

pF

L1

15

0n

H

L1

15

0n

H

C7

2.2

uF

C7

2.2

uF

U1

AT

RF

79

6xR

HB

T

TR

F7

96

0R

HB

U1

AT

RF

79

6xR

HB

T

TR

F7

96

0R

HB

I/O

_2

19

I/O

_1

18

MO

D1

4

VS

S1

0

I/O

_0

17

SY

S_

CL

K2

7

VS

S_

D2

9

RX

_IN

29

RX

_IN

18

VD

D_

X3

2

VS

S_

A1

5

OS

C_

OU

T3

0

VS

S_

PA

6

TX

_O

UT

5

OS

C_

IN3

1

VD

D_

RF

3

DA

TA

_C

LK

26

IRQ

13

VS

S_

RX

7

AS

K/O

OK

12

EN

22

5

VIN

2

VD

D_

A1

EN

28

VD

D_

I/O

16

VD

D_

PA

4

MO

SI

24

MIS

O2

3

I/O

_5

22

SLA

VE

SE

LE

CT

21

BA

ND

_G

AP

11

I/O

_3

20

TH

_P

AD

33

TP

6R

X_

IN1

TP

6R

X_

IN1

TP

85

0O

hm

TP

85

0O

hm

R6

68

0R

66

80

C2

7

1p

FD

NI

C2

7

1p

FD

NI

TP

10

IRQ

TP

10

IRQ

U2

TP

S6

12

22

DC

KT

U2

TP

S6

12

22

DC

KT

VIN

1

FB

2

VO

UT

4L

5

GN

D3

EN

6

C2

22

7p

FC

22

27

pF

TP

3B

GT

P3

BG

TP

7R

X_

IN2

TP

7R

X_

IN2

C6

0.0

1u

F

C6

0.0

1u

F

L4

4.7

uH

L4

4.7

uH

P1

SF

M-1

10

-02

-L-D

-AR

F1 P1

SF

M-1

10

-02

-L-D

-AR

F1

20

18

16

14

12

10

8642

19

17

15

13

1197531

C1

76

80

pF

C1

76

80

pF

TP

12

MIS

OT

P1

2M

ISO

C2

61

0u

FC

26

10

uF

TP

4A

SK

/OO

KT

P4

AS

K/O

OK

TP

13

MO

SI

TP

13

MO

SI

TP

11

SY

S_

CL

KT

P1

1S

YS

_C

LK

C1

415

00

pF

C1

415

00

pF

C2

3

68

pF

C2

3

68

pF

C2

06

80

pF

C2

06

80

pF

C1

0

0.0

1u

F

C1

0

0.0

1u

F

C5

2.2

uF

C5

2.2

uF

TP

14

SS

TP

14

SS

www.ti.com TRF7960TB Module Schematic

6 TRF7960TB Module Schematic

Figure 2 shows a schematic of the TRF7960TB module.

Figure 2. TRF7960TB Module Schematic




TRF7960TBmodule

connects here

RF3 DebugHeader

MSP-EXP430F5438 Experimenters Board www.ti.com

7 MSP-EXP430F5438 Experimenters Board

The MSP430F5438 Experimenter Board (MSP-EXP430F5438) is a development platform for the latestgeneration MSP430 MCUs. It features a 100-pin socket which supports the MSP430F5438 (data sheet)and other devices with similar pinouts. The socket allows for quick upgrades to newer devices or quickapplications changes. It is also compatible with many TI low-power RF wireless evaluation modules suchas the CC2520EMK and the TRF7960TB module discussed here in this document.

The Experimenter Board helps designers quickly learn and develop using the new F5xx MCUs, whichprovide the industry's lowest active power consumption, more memory and leading integration forapplications such as energy harvesting, wireless sensing and automatic metering infrastructure (AMI).

A TI Flash Emulation Tool, like the MSP-FET430UIF, is required to program and debug the MSP430devices on the experimenter board.

The TRF7960TB module plugs into the RF1 and RF2 headers on this MSP-EXP board (see Figure 3). Forlogic analyzer connection during firmware debug, user can use test points on TRF7960TB board or pinson header RF3.

Figure 3. MSP-EXP430F5438 Development Board



http://focus.ti.com/docs/prod/folders/print/msp430f5438.html

http://www.ti.com/lit/pdf/SLAS612

http://focus.ti.com/docs/toolsw/folders/print/msp-fet430uif.html


RF3 Debug

Header

www.ti.com MSP-EXP430F5438 Experimenters Board

Figure 4. Debug Header (RF3) Logic Analyzer Connections for Monitoring SPI Communications BetweenMSP430F5438A and TRF796x on TRF7960TB Module

Figure 5. Firmware Development\Debug Setup for MSP-EXP430F5438 Experimenters Board




DK-LM3S9B96-EM2-TRF7960R ARM® Cortex™-M3 Development Board www.ti.com

8 DK-LM3S9B96-EM2-TRF7960R ARM® Cortex™-M3 Development Board

The Stellaris™ DK-LM3S9B96-EM2-TRF7960R Development Kit provides a feature-rich developmentplatform for Ethernet, USB OTG/Host/Device, and CAN-enabled Stellaris ARM Cortex-M3 basedmicrocontrollers. Each board has an In-Circuit Debug Interface (ICDI) that provides hardware debuggingfunctionality not only for the on-board Stellaris devices, but also for any Stellaris microcontroller-basedtarget board. The development kit contains all cables, software, and documentation needed to developand run applications for Stellaris microcontrollers easily and quickly. The StellarisDK-LM3S9B96-EM2-TRF7960R Development Kit features: StellarisWare® Peripheral Library, USB Library,and Graphics Library in conjunction with ARM development tools from ARM tools partners. An EPI headerto EM header interface board (DK-LM3S9B96-EM2) is needed for use with the TRF7960TB module.

Figure 6. DK-LM3S9B96-EM2-TRF7960R Development Platform



http://www.ti.com/stellariswireless

http://www.ti.com/stellariswireless


www.ti.com Quick Start

9 Quick Start1. Plug the TRF7960TB module into the microcontroller development platform of choice.

NOTE: If using the DK-LM3S9B96 board, remove the SDRAM module and replace it with theDK-LM3S9B96-EM2 interface board before mounting the TRF7960TB module.

2. Apply power3. Load base application firmware specific to platform working with.4. Test for basic communication and functionality.5. Modify and debug code as desired for specific application or protocol.6. Test for advanced functionality as implemented by modified code.

10 Base Application Firmware

TRF7960TB Module Base Application Firmware for various Texas Instruments microcontrollers andmicroprocessors is available from:

MSP430F23xx (CCS or IAR): SLOC203MSP430F5438A product pageLM3S9B96 product page

11 Platform Specific Details• DK-LM3S9B96 Platform

– MIFARE™-specific standalone demo source code availableThis code demonstrates (on up to two cards at a time) reading, authenticating, and interacting withthe blocks and sectors of MIFARE Classic 1k and 4k transponders

• MSP-EXP430F5438A Experimenters Board

– Code example interfaces with standard TRF7960EVM GUITRF7960EVM GUI Software (SLOC134)TRF7960EVM User's Guide (SLOU192)

– ISO15693 UID and Block 0 Read/Automatic Product ID DemoThis code displays a single ISO15693 UID, RSSI Value, and Block 0 Read/Automatic Product IDDemo on the LCD. If more tags are in the field, or if a different protocol is desired, this coderequires use of the TRF7960 PC-based GUI to display multiple tags or interact with otherprotocol-based transponders.




http://focus.ti.com/docs/toolsw/folders/print/msp-exp430f5438.html

http://focus.ti.com/docs/toolsw/folders/print/dk-lm3s9b96.html


http://www.ti.com/lit/pdf/SLOU192


Mechanical/Physical Information www.ti.com

12 Mechanical/Physical Information

Figure 7. Mechanical/Physical Information




RES(total) 2

1C =

ω L

RES(total) 2

1C =

(2π × 13.56 MHz) × 0.95 μH

RES(total)C = 145.157 pF

PARRQ =

2πfL

PARR = 2πfLQ

PARR = 1.29 kΩ

PARR = 647 Ω

www.ti.com Antenna Tuning Details

13 Antenna Tuning Details

Module antenna as shipped is tuned for 50-Ω impedance at 13.56 MHz. It has a nominal bandwidth of 1.3MHz, which results in a quality factor of approximately 10. Module antenna circuit has a board mountedUFL connector installed for users to experiment with different tuning solutions or disconnect the onboardantenna and experiment with antennas of their own design or application. Below are somedesign/application notes to reference when changing the antenna Q factor or experimenting further toimprove a particular application.

TRF7960TB coil antenna tuning details starts with calculations to produce the theoretical values shownbelow (and based on measurements of antenna coil on Rev B board.) Coil value nominally measures 0.95µH at 13.56 MHz and XL = 0.8 + j80.8 = 0.990 at 63.4°.

To calculate the necessary values required for course resonance tuning and proper Q setting of theantenna, Equation 1 is used.

(1)

Where, w = 2pf

Therefore,

(2)

(3)

The dampening resistor value can now be calculated for a desired Q value using Equation 4.

(4)

Therefore,

(5)

For Q = ~20 (ISO15693 operations):

(6)

Use standard value of 1.3 kΩ.

For Q = ~10 (ISO14443 and ISO15693 operations):

(7)

Use standard value of 680 Ω.




Antenna Tuning Details www.ti.com

Figure 8 shows a Smith Chart simulation for RPAR value = 1.3 kΩ. This chart indicates theoretical paralleland series capacitor values capacitor values to be 97 pF and 51 pF, respectively. This is less than a +2%change from the calculated total cap value.

Figure 8. Smith Chart Simulation (RPAR = 1.3 kΩ)

Figure 9 shows a Smith Chart simulation for RPAR value = 680 Ω (standard value). This chart indicatestheoretical parallel and series capacitor values to be 82 pF and 69 pF, respectively. This is less than a+4% change from the calculated value.

Figure 9. Smith Chart Simulation (RPAR = 680 Ω)




325

525

725

925

1130

1330

1530

1730

4 6 8 10 12 14 16 18 20

Q Value

Resis

tan

ce (

)W

680.71

1300

RPAR

42E-12

52E-12

62E-12

72E-12

82E-12

92E-12

102E-12

4 6 8 10 12 14 16 18 20

Q Value

Cap

acit

an

ce (

pF

)

68E-12

82E-12

97E-12

51E-12

CPAR

CSER

www.ti.com Antenna Tuning Details

The calculations and simulations for a desired Q range of 5 to 20 result in the graphs shown in Figure 10and Figure 11, which indicate the required resistor and capacitance values that should be populated.

Figure 10. Theoretical Parallel Resistor Value for Desired Q

Figure 11. Theoretical Capacitance Values for Resonance at Desired Q




Antenna Tuning Details www.ti.com

Figure 12 and Figure 13 show actual measurements on TRF7960TB module for high and lower Q valuetuning solutions.

Figure 12. Higher Q Antenna Measurement Plots with Calculated Values (Q = ~20)

Figure 13. Lower Q Antenna Measurement Plots with Calculated Values (Q = ~10)




0

2

4

6

8

10

12

RI-I16-11xA-xx

(24.2mm)

RI-HDT-DVBx

(22mm)

RI-I17-11xA-xx

(32.5mm)

RI-I03-11xA-xx

(38mm x 22.5mm)

RI-I11-11xA/B-xx

(45mm x 45mm)

RI-I15-112B-03

(65mm x 45mm)

RI-I02-11xA/B-xx

(76mm x 45mm)

Higher Q Read Range (cm) Lower Q Read Range (cm)

0

1

2

3

4

5

6

7

20mm 27mm 30mm 76mm x 45mm


0

1

2

3

4

5

6

7

15mm 22mm x 30mm 38mm x 22.5mm 51mm x 32mm 76mm x 35mm 76mm x 45mm


www.ti.com TRF7960TB Module Read Ranges

14 TRF7960TB Module Read Ranges

Figure 14 through Figure 16 show read ranges for the TRF7960TB using different ISO standards.

Figure 14. ISO15693 Transponder Read Ranges with TRF7960TB

Figure 15. ISO14443A Transponder Read Ranges with TRF7960TB

Figure 16. ISO14443B Transponder Read Ranges with TRF7960TB




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Following are URLs where you can obtain information on other Texas Instruments products and application solutions:

Products Applications

Amplifiers amplifier.ti.com Audio www.ti.com/audio

Data Converters dataconverter.ti.com Automotive www.ti.com/automotive

DLP® Products www.dlp.com Communications and www.ti.com/communicationsTelecom

DSP dsp.ti.com Computers and www.ti.com/computersPeripherals

Clocks and Timers www.ti.com/clocks Consumer Electronics www.ti.com/consumer-apps

Interface interface.ti.com Energy www.ti.com/energy

Logic logic.ti.com Industrial www.ti.com/industrial

Power Mgmt power.ti.com Medical www.ti.com/medical

Microcontrollers microcontroller.ti.com Security www.ti.com/security

RFID www.ti-rfid.com Space, Avionics & www.ti.com/space-avionics-defenseDefense

RF/IF and ZigBee® Solutions www.ti.com/lprf Video and Imaging www.ti.com/video

Wireless www.ti.com/wireless-apps

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http://dataconverter.ti.com

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http://www.dlp.com

http://www.ti.com/communications

http://dsp.ti.com

http://www.ti.com/computers

http://www.ti.com/clocks

http://www.ti.com/consumer-apps

http://interface.ti.com

http://www.ti.com/energy

http://logic.ti.com

http://www.ti.com/industrial

http://power.ti.com

http://www.ti.com/medical

http://microcontroller.ti.com

http://www.ti.com/security

http://www.ti-rfid.com

http://www.ti.com/space-avionics-defense

http://www.ti.com/lprf

http://www.ti.com/video

http://www.ti.com/wireless-apps

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