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
3
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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.
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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
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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 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)
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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
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Antenna Tuning Example
Tuning components will
change for different
inductance values
Fixed
+5VDC
out
BG
VDD
VDD_X
LD VIN
+5VDC
GND
C21
100pF
C21
100pF
C28
2pF
DNI
C28
2pF
DNI
ANT1
0.950uH
ANT1
0.950uH
IN
1
GND
2
C2
0.01uF
C2
0.01uF
J1
COAXIAL
TST_PORT J1
COAXIAL
TST_PORT
1
2
3
R1
10k
R1
10k
C19
220pF
C19
220pF
TP5 GND TP5 GND
R4
10k
R4
10k
C13 1500pFC13 1500pF
C25
10uF
C25
10uF
C4
0.01uF
C4
0.01uF
R3
10k
R3
10k
C15
1200pF
C15
1200pF
C9
2.2uF
C9
2.2uF
C16
1200pF
C16
1200pF
TP9
MOD
TP9
MOD
C3
2.2uF
C3
2.2uF
C24
82pF
C24
82pF
R2
10k
R2
10k
C8
0.01uF
C8
0.01uF
TP2
VDD_X
TP2
VDD_X
R5 0R5 0
C11 27pFC11 27pF
P2
SFM-110-02-L-D-A
RF2 P2
SFM-110-02-L-D-A
RF2
20 18 16 14 12 10 8 6 4 2
19 17 15 13 11
9 7 5 3 1
C12 27pFC12 27pF
C1
2.2uF
C1
2.2uF
TP1
+5VDC
TP1
+5VDC
TP15
DATA_CLK
TP15
DATA_CLK
L2
330nH
L2
330nH
OSC1
13.560MHz
OSC1
13.560MHz
GND 2 GND 4
XTAL2
3XTAL1 1
C18 10pFC18 10pF
L1
150nH
L1
150nH
C7
2.2uF
C7
2.2uF
U1A
TRF796xRHBT
TRF7960RHB
U1A
TRF796xRHBT
TRF7960RHB
I/O_2
19
I/O_1
18
MOD
14
VSS 10
I/O_0 17
SYS_CLK
27
VSS_D 29
RX_IN2 9 RX_IN1 8
VDD_X
32
VSS_A 15
OSC_OUT 30
VSS_PA 6
TX_OUT 5
OSC_IN 31
VDD_RF
3
DATA_CLK
26
IRQ
13
VSS_RX 7
ASK/OOK
12
EN2
25
VIN
2
VDD_A
1
EN
28
VDD_I/O
16
VDD_PA
4
MOSI
24
MISO
23
I/O_5 22
SLAVE SELECT
21
BAND_GAP
11
I/O_3 20
TH_PAD 33
TP6
RX_IN1
TP6
RX_IN1
TP8
50 Ohm
TP8
50 Ohm
R6
680
R6
680
C27
1pF
DNI
C27
1pF
DNI
TP10 IRQ TP10 IRQ
U2
TPS61222DCKT
U2
TPS61222DCKT
VIN 1
FB
2
VOUT
4L5
GND 3
EN 6
C22
27pF
C22
27pF
TP3
BG
TP3
BG
TP7
RX_IN2
TP7
RX_IN2
C6
0.01uF
C6
0.01uF
L4
4.7uH
L4
4.7uH
P1
SFM-110-02-L-D-A
RF1
P1
SFM-110-02-L-D-A
RF1
20 18 16 14 12 10 8 6 4 2
19 17 15 13 11
9 7 5 3 1
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
C5
2.2uF
C5
2.2uF
TP14 SS TP14 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
9
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TRF7960TB
module
connects here
RF3 Debug
Header
MSP-EXP430F5438 Experimenters Board www.ti.com
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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