Texas Instruments TRF7960TB User manual

TRF7960TB HF RFID Reader Module

User's Guide

Literature Number: SLOU297

October 2010

2SLOU297–October 2010

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1 Purpose ............................................................................................................................. 5

2 Scope ................................................................................................................................ 5

3 References ......................................................................................................................... 5

4 TRF7960TB Module Description ............................................................................................ 6

5 TRF7960TB Connections/Technical Details ............................................................................ 7

6 TRF7960TB Module Schematic ............................................................................................. 9

7 MSP-EXP430F5438 Experimenters Board ............................................................................. 10

8 DK-LM3S9B96-EM2-TRF7960R ARM® Cortex™-M3 Development Board .................................. 12

9 Quick Start ....................................................................................................................... 13

10 Base Application Firmware ................................................................................................. 13

11 Platform Specific Details .................................................................................................... 13

12 Mechanical/Physical Information ......................................................................................... 14

13 Antenna Tuning Details ...................................................................................................... 15

14 TRF7960TB Module Read Ranges ........................................................................................ 19

SLOU297–October 2010 Table of Contents

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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 Between

MSP430F5438A 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

4List of Figures SLOU297–October 2010

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User's Guide

SLOU297–October 2010

TRF7960TB HF RFID Reader Module

1 Purpose

This document provides direction for TRF796x users implementing a 13.56-MHz RFID reader solution

using the TRF796x IC connected to a Texas Instruments embedded microcontroller or microprocessor

development platform. Examples of such development platforms are the MSP-EXP430F5438 board, the

ARM®Cortex™-M3 based DK-LM3S9B96 board, MAVRK™ Reference Kit, or any other TI embedded

microcontroller platform with the EM socket headers populated.

2 Scope

This document describes the TRF7960TB module as it relates to using the module for evaluation and

development purposes in conjunction with Texas Instruments Embedded Development platforms. This

manual does not cover the in-depth details of the TRF796x reader IC family, as those details are

documented in the data sheets for those parts, along with application notes that can be found on the

product 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 Overview

TFM 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.

SLOU297–October 2010 TRF7960TB HF RFID Reader Module

TRF7960TB Module Description

www.ti.com

4 TRF7960TB Module Description

The TRF7960TB Evaluation Module (EVM) (see Figure 1) allows the software application developer to

become familiar with the functionalities of TRF7960 Multi-Standard Fully Integrated 13.56-MHz RFID

reader IC with the freedom to develop on the Texas Instruments embedded microcontroller development

platform of choice.

The TRF7960TB module also allows customer-driven antenna tuning with onboard coil and

customer-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 over

the 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 to

TRF7960 IC for +23 dBm (full transmitter power out) operations.

An impedance-matching circuit from 4 Ωto 50 Ωis populated on the module, and this is connected to a

tuned 50-Ωantenna circuit that consists of an onboard four-turn coil with series and parallel passive

elements (capacitors and a resistor).

Test points are available on the board for checking firmware operations with oscilloscope or logic

analyzer, impedance matching, and for attaching an external antenna.

Connection to Texas Instruments microcontroller platforms are made via Samtec EM headers located on

the back of the board (connectors P1/RF1 and P2/RF2).

Figure 1. TRF7960TB Evaluation Module

6TRF7960TB HF RFID Reader Module SLOU297–October 2010

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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 Description

No.

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 care

9 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 active

12 EN2 during power down to support the microcontroller. Pin can also be used for pulse wake-up from

power-down mode.

13 N/C No connection

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

15 N/C No connection

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

17 N/C No connection

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)

SLOU297–October 2010 TRF7960TB HF RFID Reader Module

TRF7960TB Connections/Technical Details

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Table 2. Connector P2/RF2

Pin Signal Name Description

No.

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)

10 N/C No connection

11 N/C No connection

12 N/C No connection

13 N/C No connection

14 N/C No connection

15 N/C No connection

16 N/C No connection

17 N/C No connection

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).

19 N/C No connection

20 N/C No connection

8TRF7960TB HF RFID Reader Module SLOU297–October 2010

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Antenna Tuning Example

Tuning components will

change for different

inductance values

Fixed

+5VDC

out

VDD

VDD_X

LD VIN

+5VDC

GND

C21

100pF

C21

100pF

C28

2pF

DNI

C28

2pF

DNI

ANT1

0.950uH

ANT1

0.950uH

GND

0.01uF

COAXIAL

TST_PORT

COAXIAL

TST_PORT

10k

C19

220pF

C19

220pF

TP5

GND

TP5

GND

10k

C13 1500pFC13 1500pF

C25

10uF

C25

10uF

0.01uF

10k

C15

1200pF

C15

1200pF

2.2uF

C16

1200pF

C16

1200pF

TP9

MOD

TP9

MOD

2.2uF

C24

82pF

C24

82pF

10k

0.01uF

TP2

VDD_X

TP2

VDD_X

R5 0R5 0

C11 27pFC11 27pF

SFM-110-02-L-D-A

RF2

SFM-110-02-L-D-A

RF2

C12 27pFC12 27pF

2.2uF

TP1

+5VDC

TP1

+5VDC

TP15

DATA_CLK

TP15

DATA_CLK

330nH

OSC1

13.560MHz

OSC1

13.560MHz

GND 2

GND 4

XTAL2

3XTAL1

C18 10pFC18 10pF

150nH

2.2uF

U1A

TRF796xRHBT

TRF7960RHB

U1A

TRF796xRHBT

TRF7960RHB

I/O_2

I/O_1

MOD

VSS 10

I/O_0 17

SYS_CLK

VSS_D 29

RX_IN2 9

RX_IN1 8

VDD_X

VSS_A 15

OSC_OUT 30

VSS_PA 6

TX_OUT 5

OSC_IN 31

VDD_RF

DATA_CLK

IRQ

VSS_RX 7

ASK/OOK

EN2

VIN

VDD_A

VDD_I/O

VDD_PA

MOSI

MISO

I/O_5 22

SLAVE SELECT

BAND_GAP

I/O_3 20

TH_PAD 33

TP6

RX_IN1

TP6

RX_IN1

TP8

50 Ohm

TP8

50 Ohm

680

C27

1pF

DNI

C27

1pF

DNI

TP10

IRQ

TP10

IRQ

TPS61222DCKT

VIN 1

VOUT

4L5

GND 3

EN 6

C22

27pF

C22

27pF

TP3

TP7

RX_IN2

TP7

RX_IN2

0.01uF

4.7uH

SFM-110-02-L-D-A

RF1

SFM-110-02-L-D-A

RF1

C17

680pF

C17

680pF

TP12

MISO

TP12

MISO

C26

10uF

C26

10uF

TP4

ASK/OOK

TP4

ASK/OOK

TP13

MOSI

TP13

MOSI

TP11

SYS_CLK

TP11

SYS_CLK

C14 1500pFC14 1500pF

C23

68pF

C23

68pF

C20

680pF

C20

680pF

C10

0.01uF

C10

0.01uF

2.2uF

TP14

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TRF7960TB Module Schematic

6 TRF7960TB Module Schematic

Figure 2 shows a schematic of the TRF7960TB module.

Figure 2. TRF7960TB Module Schematic

SLOU297–October 2010 TRF7960TB HF RFID Reader Module

TRF7960TB

module

connects here

RF3 Debug

Header

MSP-EXP430F5438 Experimenters Board

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7 MSP-EXP430F5438 Experimenters Board

The MSP430F5438 Experimenter Board (MSP-EXP430F5438) is a development platform for the latest

generation 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 quick

applications changes. It is also compatible with many TI low-power RF wireless evaluation modules such

as 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, which

provide the industry's lowest active power consumption, more memory and leading integration for

applications 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 MSP430

devices on the experimenter board.

The TRF7960TB module plugs into the RF1 and RF2 headers on this MSP-EXP board (see Figure 3). For

logic analyzer connection during firmware debug, user can use test points on TRF7960TB board or pins

on header RF3.

Figure 3. MSP-EXP430F5438 Development Board

10 TRF7960TB HF RFID Reader Module SLOU297–October 2010

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