TRF79x0ATB NFC/HF RFID Reader Module

TRF79x0ATB NFC/HF RFID Reader Module
TRF79x0ATB NFC/HF RFID Reader Module
User's Guide
Literature Number: SLOU372A
June 2013 – Revised June 2014
Contents
1
2
3
4
5
6
7
8
9
10
11
12
TRF79x0ATB Module Descriptions ......................................................................................... 5
TRF79x0ATB Connections and Technical Details ..................................................................... 6
TRF79x0ATB Module Schematic ............................................................................................ 8
MSP-EXP430F5529 Experimenters Board .............................................................................. 11
LM4F232 Evaluation Kit (EK-LM4F232) .................................................................................. 12
DK-LM3S9B96-EM2-TRF7960R ARM Cortex M-3 Development Board ........................................ 13
Quick Start ........................................................................................................................ 14
Base Application Firmware .................................................................................................. 14
Mechanical and Physical Information.................................................................................... 15
Antenna Tuning Details ....................................................................................................... 15
TRF79x0ATB Module Read Ranges ...................................................................................... 19
References ........................................................................................................................ 20
Revision History .......................................................................................................................... 21
2
Table of Contents
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List of Figures
1
TRF7960ATB Evaluation Module .......................................................................................... 5
2
TRF7970ATB Evaluation Module .......................................................................................... 6
3
TRF79x0ATB Module Schematic .......................................................................................... 8
4
MSP-EXP430F5438 Development Board ................................................................................ 9
5
Debug Header (RF3) Logic Analyzer Connections for Monitoring SPI Communications Between
MSP430F5438A and TRF79x0A on TRF79x0ATB Module .......................................................... 10
6
Firmware Development and Debug Setup for MSP-EXP430F5438 Experimenters Board ....................... 10
7
MSP-EXP430F5529 Development Board ............................................................................... 11
8
MSP-EXP430F5539 RF EVM Header Pinouts (RF1 and RF2) ...................................................... 11
9
Debug Header (J12) Logic Analyzer Connections for Monitoring SPI Communications Between
MSP430F5529 and TRF79x0A on TRF79x0ATB Module ............................................................ 12
10
EK-LM4F232 Development Platform (EM header locations on backside) .......................................... 12
11
DK-LM3S9B96-EM2-TRF7960R Development Platform .............................................................. 13
12
Theoretical Parallel Resistor Value for Desired Q ..................................................................... 17
13
Theoretical Capacitance Values for Resonance at Desired Q ....................................................... 17
List of Tables
1
Connector P1/RF1 ........................................................................................................... 6
2
Connector P2/RF2 ........................................................................................................... 7
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List of Figures
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3
User's Guide
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TRF79x0ATB NFC/HF RFID Reader Module
This evaluation module provides directions for TRF7960A and TRF7970A users to implement a 13.56MHz NFC/RFID reader solution using the TRF79x0A IC connected to a Texas Instruments embedded
microcontroller or microprocessor development platform. Examples of such development platforms are:
the MSP-EXP430F5438 board, MSP-EXP430F5529 board, the ARM® Cortex™-M3/M4-based board, or
any other TI embedded microcontroller platforms with the EM socket headers populated.
This document also covers the TRF79x0ATB module as it relates to using the module for evaluation and
development purposes in conjunction with Texas Instruments Embedded Development platforms. It does
not cover the in-depth details of the TRF79x0A NFC/RFID IC families, as those details are well
documented in the data sheets for those parts, along with application reports that can be found on the
product pages (see Section 12).
FCC/IC Regulatory Compliance:
• FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15, Class A Compliant
• IC – INDUSTRY CANADA Class A Compliant
Tiva is a trademark of Texas Instruments.
4Stellaris,TRF79x0ATB
RFID Reader
Module
SLOU372A – June 2013 – Revised June 2014
StellarisWareNFC/HF
are registered
trademarks
of Texas Instruments.
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Cortex is a trademark of ARM Limited.
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ARM is a registered trademark of ARM Limited.
All other trademarks are the property of their respective owners.
TRF79x0ATB Module Descriptions
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1
TRF79x0ATB Module Descriptions
The TRF79x0ATB evaluation modules are intended to allow the software application developer to get
familiar with the functionalities of either of the TRF79x0A Multi-Standard Fully Integrated 13.56 MHz
NFC/RFID reader ICs with the freedom to develop on their Texas Instruments Embedded microcontroller
development platform of choice.
The TRF79x0ATB module is also intended to allow customer driven antenna tuning with onboard coil and
customer driven antenna form factor design.
The module is hard wired for SPI communications, supports Slave Select and TRF79x0A Direct Mode 2
(default), Direct Mode 1 and Direct Mode 0 operations. The user also has access to and full control over
the TRF79x0A EN2 and EN lines, allowing for design and development of ultra low power NFC/HF RFID
systems.
The module has an onboard boost converter (TPS61222DCKT) that boosts +3.3 VDC in to +5 VDC out to
TRF79x0A 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 a
tuned 50 Ω antenna circuit, which 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 the oscilloscope or logic
analyzer, impedance matching and for attaching external antenna.
Connection to Texas Instruments Microcontroller platforms are made via Samtec EM headers located on
the underside of the board (Connectors P1/RF1 and P2/RF2).
Figure 1. TRF7960ATB Evaluation Module
SLOU372A – June 2013 – Revised June 2014
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5
TRF79x0ATB Connections and Technical Details
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Figure 2. TRF7970ATB Evaluation Module
2
TRF79x0ATB Connections and Technical Details
Table 1. Connector P1/RF1
Pin No
6
Signal Name
Description
1
GND
Ground
2
N/C
3
MOD
4
N/C
5
N/C
6
N/C
7
IRQ
8
N/C
9
SYS_CLK
Clock for MCU (optional)
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
12
EN2
13
N/C
14
SLAVE SELECT
15
N/C
16
DATA_CLK
17
N/C
18
MOSI
I/O_7, Master Out, Slave In (Data In from MCU)
19
GND
Ground
20
MISO
I/O_6, Master In, Slave Out (Data Out from TRF7960)
Direct mode, external modulation input
Interrupt request (from TRF79x0A to MCU)
Pulse enable and selection of power down mode. If EN2 is connected to VIN, then
VDD_X is active during power down to support the MCU. Pin can also be used for
pulse wake-up from power-down mode.
Slave Select, I/O_4 (Active Low)
Data Clock Input for MCU Communication (from MCU)
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Table 2. Connector P2/RF2
Pin No
Signal Name
1
N/C
2
N/C
3
N/C
4
N/C
5
N/C
6
N/C
7
+3.3VDC IN
8
N/C
9
+3.3VDC IN
10
N/C
11
N/C
12
N/C
13
N/C
14
N/C
15
N/C
16
N/C
17
N/C
18
ASK/OOK
19
N/C
20
N/C
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Description
+VDC in (to TPS61222DCKT for generation of +5 VDC)
+VDC in (to TPS61222DCKT for generation of +5 VDC)
Direct mode, selection between ASK and OOK modulation (0 = ASK, 1 = OOK)
Also can be configured to provide the received analog signal output (ANA_OUT)
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TRF79x0ATB Module Schematic
3
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TRF79x0ATB Module Schematic
A
This schematic drives two separate layouts. (TRF7960ATB.brd and TRF7970ATB.brd) the only difference is the
bottom side silkscreen.
Figure 3. TRF79x0ATB Module Schematic
8
TRF79x0ATB NFC/HF RFID Reader Module
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TRF79x0ATB Module Schematic
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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 that 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 TRF79x0ATB module discussed 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.
Rf3 Debug
Header
TRF79x0ATB
module
connects here
Figure 4. MSP-EXP430F5438 Development Board
SLOU372A – June 2013 – Revised June 2014
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TRF79x0ATB Module Schematic
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Figure 5. Debug Header (RF3) Logic Analyzer Connections for Monitoring SPI Communications Between
MSP430F5438A and TRF79x0A on TRF79x0ATB Module
RF3 Debug
Header
Figure 6. Firmware Development and Debug Setup for MSP-EXP430F5438 Experimenters Board
10
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MSP-EXP430F5529 Experimenters Board
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4
MSP-EXP430F5529 Experimenters Board
The MSP430F5529 Experimenter Board (MSP-EXP430F5529) is a development platform for the
MSP430F5529 device, from the latest generation of MSP430 devices with integrated USB. The board is
compatible with many TI low-power RF wireless evaluation modules such as the TRF79xxATB modules.
The Experimenter Board helps designers quickly learn and develop using the new F55xx MCUs, which
provide the industry's lowest active power consumption, integrated USB, and more memory and leading
integration for applications such as NFC, HF RFID, energy harvesting, wireless sensing and automatic
metering infrastructure (AMI).
The MSP430F5529 device on the experimenter board can be powered and debugged via the integrated
ezFET, or via TI Flash Emulation Tool, like the MSP-FET430UIF.
The TRF79x0ATB module plugs into the RF1 and RF2 headers on this MSP-EXP board (see Figure 7 and
Figure 8). For logic analyzer connection during firmware debug, user can use test points on TRF79x0ATB
board or pins on header J12 (see Figure 9).
TRF79 x0A TB
module
connects here
Logic
Analyzer
and
Debug
Header
J12
Firmware
Download/Debug
Header
Figure 7. MSP-EXP430F5529 Development Board
Figure 8. MSP-EXP430F5539 RF EVM Header Pinouts (RF1 and RF2)
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LM4F232 Evaluation Kit (EK-LM4F232)
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Figure 9. Debug Header (J12) Logic Analyzer Connections for Monitoring SPI Communications Between
MSP430F5529 and TRF79x0A on TRF79x0ATB Module
5
LM4F232 Evaluation Kit (EK-LM4F232)
The Tiva™ C Series LM4F232 USB+CAN Development Kit is a compact and versatile evaluation platform
for the Tiva C series TM4C123GH6PGE ARM Cortex-M4F-based microcontroller. The evaluation kit
design highlights the TM4C123GH6PGE microcontroller integrated USB 2.0 On-the-Go/Host/Device
interface, CAN, analog, and low-power capabilities.
The evaluation kit features the TM4C123GH6PGE microcontroller in a 144-LQFP package, a color OLED
display, USB OTG connector, a microSD card slot, a coin cell battery for use with the Tiva C Series lowpower Hibernate mode, a temperature sensor, a three-axis accelerometer for motion detection, and easy
access through holes to all of the available device signals.
The kit also includes extensive source code examples, allowing you to start building C code applications
quickly.
Figure 10. EK-LM4F232 Development Platform (EM header locations on backside)
12
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DK-LM3S9B96-EM2-TRF7960R ARM Cortex M-3 Development Board
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6
DK-LM3S9B96-EM2-TRF7960R ARM Cortex M-3 Development Board
The Stellaris® DK-LM3S9B96-EM2-TRF7960R Development Kit provides a feature-rich development
platform for Ethernet, USB OTG/Host/Device, and CAN enabled Stellaris ARM Cortex-M3-based
microcontrollers. Each board has an In-Circuit Debug Interface (ICDI) that provides hardware debugging
functionality not only for the on-board Stellaris devices, but also for any Stellaris microcontroller-based
target board. The development kit contains all cables, software, and documentation needed to develop
and run applications for Stellaris microcontrollers easily and quickly. The Stellaris DK-LM3S9B96-EM2TRF7960R Development Kit features: StellarisWare® Peripheral Library, USB Library, and Graphics
Library in conjunction with ARM development tools from ARM tools partners. An EPI header to EM header
interface board (DK-LM3S9B96-EM2) is needed for use with the TRF7960TB module.
Figure 11. DK-LM3S9B96-EM2-TRF7960R Development Platform
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Quick Start
7
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Quick Start
1. Plug TRF79x0ATB Module into microcontroller development platform of choice.
NOTE: If DK-LM3S9B96 board, remove SDRAM module and replace with DK-LM3S9B96-EM2
interface board before attempting to mount TRF79x0ATB module.
2.
3.
4.
5.
6.
8
Apply power.
Load the base application firmware specific to the platform that you are working with.
Test for basic communication and functionality.
Modify and Debug code as desired for specific application or protocol.
Test for advanced functionality as implemented by modified code.
Base Application Firmware
TRF79x0ATB module base application firmware for various Texas Instruments Microcontrollers are
available here:
• MSP430F23xx: http://www.ti.com/litv/zip/sloc203 (Code Composer Studio or IAR)
• MSP430F5438A: http://focus.ti.com/docs/toolsw/folders/print/msp-exp430f5438.html
• MSP430F5529: http://www.ti.com/tool/nfclink
• LM4F232: http://www.ti.com/tool/ekc-lm4f232
• LM3S9B96: http://www.ti.com/tool/dk-em2-7960r
14
TRF79x0ATB NFC/HF RFID Reader Module
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Mechanical and Physical Information
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9
Mechanical and Physical Information
10
Antenna Tuning Details
Module antenna as shipped is tuned for 50 Ω impedance at 13.56 MHz. It has a nominal bandwidth of 1.3
MHz, which results in a quality factor of approximately 10. Module antenna circuit has a board mounted
U.FL connector installed for users that want to experiment with different tuning solutions or disconnect
onboard antenna and experiment with antennas of their own design or application. Below are some design
and application notes for users to reference if they want to change the antenna Q factor or experiment
further on their own in order to serve their particular application directly.
TRF79x0ATB coil antenna tuning details starts with calculations to produce the theoretical values shown
below (and based on measurements of antenna coil on Rev B board.) The coil value nominally measures
0.95 µH at 13.56 MHz and XL = 0.8 + j80.8 = 0.990 @ 63.4°.
To calculate the necessary values required for course resonance tuning and proper Q setting of the
antenna, the following formula is used.
CRES(total ) =
1
w 2L
(1)
where w = 2p f
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Antenna Tuning Details
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therefore,
CRES(total ) =
1
(2p ´ 13.56 MHz )2 ´ 0.95 m H
CRES(total ) = 145.157 pF
(2)
The dampening resistor value can now be calculated for a desired Q value using the formula:
Q=
RPAR
2p fL
(3)
therefore,
RPAR = 2p fLQ
(4)
For Q = ~20 (ISO15693 operations):
RPAR = 1.29 k W
(5)
(move to standard value of 1.3 kΩ)
For Q = ~10 (ISO14443 and ISO15693 operations):
RPAR = 647 W
(6)
(move to standard value of 680 Ω)
Smith Chart simulation for RPAR value = 1.3 kΩ reveals theoretical parallel and series capacitor values
capacitor values to be 97pF and 51pF, respectively. (This is < +2% change from the calculated total cap
value.)
Smith Chart simulation for RPAR value = 680 Ω (standard value) reveals theoretical parallel and series
capacitor values to be 82 pF and 69 pF, respectively. (This is < +4% change from the calculated value.)
16
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Antenna Tuning Details
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The calculations and simulations for a desired Q range of 5 to 20 results in Figure 12 and Figure 13 that
indicate the required resistor and capacitance values should be populated.
Theoretical Parallel Resistor Value for Desired Q
001.73E+03
001.53E+03
Ohms
001.33E+03
1.30E+03
001.13E+03
Rpar
925.00E+00
725.00E+00
680.71E+00
525.00E+00
325.00E+00
4
6
8
10
12
14
16
18
20
Q Value
Figure 12. Theoretical Parallel Resistor Value for Desired Q
Theoretical Capacitance Values for Resonance at Desired Q
97.00E-12
Capacitance (in pF)
102.00E-12
092.00E-12
82.00E-12
082.00E-12
072.00E-12
Cpar
Cser
68.00E-12
062.00E-12
51.00E-12
052.00E-12
042.00E-12
4
6
8
10
12
14
16
18
20
Q
Figure 13. Theoretical Capacitance Values for Resonance at Desired Q
Actual measurements on TRF79x0ATB module for high and lower Q value tuning solutions.
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Antenna Tuning Details
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Higher Q Antenna Measurement Plots with Calculated Values (Q = ~20)
Lower Q Antenna Measurement Plots with Calculated Values (Q = ~10)
18
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TRF79x0ATB Module Read Ranges
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TRF79x0ATB Module Read Ranges
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References
12
References
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
20
www.ti.com
TRF7960A Product Page: http://www.ti.com/product/trf7960A
TRF7970A Product Page: http://www.ti.com/product/trf7970A
TPS61222 Product Page: http://www.ti.com/product/tps61222
TRF7960ATB Schematic, BOM and Design files: http://www.ti.com/lit/zip/sloc221
TRF7970ATB Schematic, BOM and Design files: http://www.ti.com/lit/zip/tidc356
LM4F232 Evaluation Kit: http://www.ti.com/tool/ek-lm4f232
TPS61220, TPS61221,TPS61222 Low Input Voltage Step-Up Converter in 6 Pin SC-70 Package Data
Sheet (SLVS776)
MSP430F543x, MSP430F541x Mixed Signal Microcontroller Data Sheet (SLAS612)
TRF7960A Multi-Protocol Fully Integrated 13.56-MHz RFID Reader/Writer IC Data Manual (SLOS732)
TRF7970A Multi-Protocol Fully Integrated 13.56-MHz RFID/Near Field Communication (NFC)
Transceiver IC Data Manual (SLOS743)
MSP-EXP430F5529 Experimenter Board User's Guide (SLAU330)
MSP-EXP430F5438 Experimenter Board User's Guide (SLAU263)
Stellaris® LM3S9B96 Development Kit User's Manual (SPMA036)
TI ISO15693/ISO18000-3 Inlays/Tags Parametric Search
http://www.ti.com/lsds/ti/wireless_connectivity/nfc_rfid/products.page#o7=Transponders, Inlays and
Dies
Samtec Header and Mate Information
– SFM: https://www.samtec.com/technical-specifications/Default.aspx?seriesMaster=SFM
– TFM: https://www.samtec.com/technical-specifications/Default.aspx?seriesMaster=TFM
Smith Chart Simulation Tool (licensed copy): http://www.fritz.dellsperger.net/
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Revision History
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Revision History
Changes from Original (June 2013) to A Revision ......................................................................................................... Page
•
Corrected links in Section 12 ........................................................................................................... 20
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
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Revision History
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