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TRF7970A
SLOS743K –AUGUST 2011 – REVISED APRIL 2014
TRF7970A Multiprotocol Fully Integrated 13.56-MHz RFID and Near Field Communication
(NFC) Transceiver IC
1 Device Overview
1.1 Features
1
• Supports Near Field Communication (NFC) • Programmable Output Power: +20 dBm (100 mW),
Standards NFCIP-1 (ISO/IEC 18092) and NFCIPತ2 +23 dBm (200 mW)
(ISO/IEC 21481)
• Programmable I/O Voltage Levels From 1.8 VDC
• Completely Integrated Protocol Handling for to 5.5 VDC
ISO15693, ISO18000-3, ISO14443A/B, and
• Programmable System Clock Frequency Output
FeliCa™
(RF, RF/2, RF/4) from 13.56-MHz or 27.12-MHz
• Integrated Encoders, Decoders, and Data Framing Crystal or Oscillator
for NFC Initiator, Active and Passive Target
• Integrated Voltage Regulator Output for Other
Operation for All Three Bit Rates (106 kbps,
System Components (MCU, Peripherals,
212 kbps, 424 kbps) and Card Emulation
Indicators), 20 mA (Max)
• RF Field Detector With Programmable Wake-Up
• Programmable Modulation Depth
Levels for NFC Passive Transponder Emulation
• Dual Receiver Architecture With RSSI for
Operation
Elimination of "Read Holes" and Adjacent Reader
• RF Field Detector for NFC Physical Collision
System or Ambient In-Band Noise Detection
Avoidance.
• Programmable Power Modes for Ultra Low-Power
• Integrated State Machine for ISO14443A
System Design (Power Down <1 µA)
Anticollision (Broken Bytes) Operation
• Parallel or SPI Interface (With 127-Byte FIFO)
(Transponder Emulation or NFC Passive Target)
• Temperature Range: –40°C to 110°C
• Input Voltage Range: 2.7 VDC to 5.5 VDC
• 32-Pin QFN Package (5 mm x 5 mm)
1.2 Applications
• Mobile Devices (Tablets, Handsets) • Short-Range Wireless Communication Tasks
(Firmware Updates)
• Secure Pairing ( Bluetooth
®
, Wi-Fi®, Other Paired
Wireless Networks) • Product Identification or Authentication
• Public Transport or Event Ticketing • Medical Equipment or Consumables
• Passport or Payment (POS) Reader Systems • Access Control, Digital Door Locks
• Sharing of Electronic Business Cards
1.3 Description
The TRF7970A device is an integrated analog front end and data-framing device for a 13.56-MHz RFID
and Near Field Communication (NFC) system. Built-in programming options make the device suitable for a
wide range of applications for proximity and vicinity identification systems.
The device can perform in one of three modes: RFID and NFC reader, NFC peer, or in card emulation
mode. Built-in user-configurable programming options make the device suitable for a wide range of
applications. The TRF7970A device is configured by selecting the desired protocol in the control registers.
Direct access to all control registers allows fine tuning of various reader parameters as needed.
Documentation, reference designs, EVM, and source code TI MSP430™ MCUs or ARM
®
MCUs are
available.
Device Information
PART NUMBER PACKAGE BODY SIZE
TRF7970ARHB VQFN (32) 5 mm x 5 mm
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
MUX
RX_IN1
RX_IN2
PHASE&
AMPLITUDE
DETECTOR
GAIN
RSSI
(AUX)
LOGIC
LEVEL SHIFTER
STATE
CONTROL
LOGIC
[CONTROL
REGISTERS &
COMMAND
LOGIC]
127-BYTE
FIFO
MCU
INTERFACE
VDD_I/O
I/O_0
I/O_1
I/O_2
I/O_3
I/O_4
I/O_5
I/O_6
I/O_7
IRQ
SYS_CLK
DATA_CLK
ISO
PROTOCOL
HANDLING
DECODER
RSSI
(EXTERNAL)
PHASE&
AMPLITUDE
DETECTOR
GAIN
RSSI
(MAIN)
FILTER
& AGC
DIGITIZER
BIT
FRAMING
FRAMING
SERIAL
CONVERSION
CRC &PARITY
TRANSMITTER ANALOG
FRONT END
TX_OUT
VDD_PA
VSS_PA
DIGITAL CONTROL
STATE MACHINE
CRYSTAL OR OSCILLATOR
TIMING SYSTEM
EN
EN2
ASK/OOK
MOD
OSC_IN
OSC_OUT
VOLTAGE SUPPLY REGULATOR SYSTEMS
(SUPPLY REGULATORS AND REFERENCE VOLTAGES)
VSS_A
VSS_RF
VDD_RF
VDD_X
VSS_D
VSS
VIN
VDD_A
BAND_GAP
RF LEVEL
DETECTOR
TRF7970A
SLOS743K –AUGUST 2011 – REVISED APRIL 2014
www.ti.com
1.4 Functional Block Diagram
Figure 1-1 shows the block diagram.
Figure 1-1. Block Diagram
2 Device Overview Copyright © 2011–2014, Texas Instruments Incorporated
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Product Folder Links: TRF7970A
TRF7970A
www.ti.com
SLOS743K –AUGUST 2011 – REVISED APRIL 2014
Table of Contents
1 Device Overview ......................................... 1 6.8 Transmitter – Digital Section ........................ 28
6.9 Transmitter – External Power Amplifier and
1.1 Features
.............................................. 1
Subcarrier Detector ................................. 29
1.2 Applications........................................... 1
6.10 TRF7970A IC Communication Interface ............ 30
1.3 Description............................................ 1
6.11 Special Direct Mode for Improved MIFARE™
1.4 Functional Block Diagram
............................ 2
Compatibility......................................... 48
2 Revision History ......................................... 4
6.12 NFC Modes.......................................... 48
3 Device Characteristics.................................. 5
6.13 Direct Commands from MCU to Reader ............ 51
4 Terminal Configuration and Functions.............. 6
6.14 Register Description................................. 55
4.1 Pin Assignments...................................... 6
7 Application Schematic and Layout
4.2 Terminal Functions
................................... 7
Considerations.......................................... 75
5 Specifications ............................................ 9
7.1 TRF7970A Reader System Using Parallel
Microcontroller Interface
............................. 75
5.1 Absolute Maximum Ratings .......................... 9
7.2 TRF7970A Reader System Using SPI With SS
5.2 Recommended Operating Conditions
................ 9
Mode ................................................ 76
5.3 Electrical Characteristics ............................ 10
7.3 Layout Considerations .............................. 77
5.4 Handling Ratings .................................... 11
7.4 Impedance Matching TX_Out (Pin 5) to 50 ...... 77
5.5 Thermal Characteristics ............................. 11
7.5 Reader Antenna Design Guidelines ................ 79
5.6 Switching Characteristics ........................... 11
8 Device and Documentation Support ............... 80
6 Detailed Description ................................... 12
8.1 Documentation Support ............................. 80
6.1 Overview ............................................ 12
8.2 Community Resources .............................. 80
6.2 System Block Diagram .............................. 15
8.3 Trademarks.......................................... 80
6.3 Power Supplies...................................... 15
8.4 Electrostatic Discharge Caution..................... 80
6.4 Receiver – Analog Section .......................... 21
8.5 Glossary ............................................. 80
6.5 Receiver – Digital Section ........................... 22
9 Mechanical Packaging and Orderable
6.6 Oscillator Section
................................... 27
Information .............................................. 80
6.7 Transmitter – Analog Section ....................... 28
9.1 Packaging Information .............................. 80
Copyright © 2011–2014, Texas Instruments Incorporated Table of Contents 3
Submit Documentation Feedback
Product Folder Links: TRF7970A
TRF7970A
SLOS743K –AUGUST 2011 – REVISED APRIL 2014
www.ti.com
2 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision J (February 2014) to Revision K Page
• Changed
Figure 1-1 to show 127-byte FIFO...................................................................................... 2
• Moved Section 3 ...................................................................................................................... 5
• Changed title of Section 4 .......................................................................................................... 6
• Changed title of Section 5 ........................................................................................................... 9
• Added ASK/OOK and MOD to VILand V
IH
........................................................................................ 9
• Moved Section 5.3 .................................................................................................................. 10
• Changed V
DD_A
TYP value from 3.5 V to 3.4 V ................................................................................. 10
• Moved Section 5.4 .................................................................................................................. 11
• Added V
(ESD)
MIN values, test specifications, and notes....................................................................... 11
• Changed title of Section 5.5 from Dissipation Ratings to Thermal Characteristics......................................... 11
• Moved Section 5.6 .................................................................................................................. 11
• Changed title of Section 6.......................................................................................................... 12
• Moved previous Section 3, Device Overview, to Section 6.1.................................................................. 12
• Changed from "By default, the AGC is frozen after..." to "By default, the AGC window comparator is set after..." ... 21
• Changed from "TX Pulse Length Control register (0x05)" to "TX Pulse Length Control register (0x06)" ............... 28
• Changed from "18.8 s" to "18.8 µs" in the sentence that starts with "If the register contains all zeros..."............... 28
• Changed Table 6-18 to match Table 6-43 ....................................................................................... 50
• Changed command 0x18 to "Test internal RF" ................................................................................. 51
• Changed command 0x19 to "Test external RF" ................................................................................ 51
• Moved Section 6.14................................................................................................................. 55
• Changed the sentence that starts "The AGC action is fast..." from "finishes after four subcarrier pulses" to
"finishes within eight subcarrier pulses"
......................................................................................... 64
• Moved Section 7..................................................................................................................... 75
• Deleted previous Section 10, System Design, and moved contents to Section 7.3 through Section 7.5 ............... 77
• Removed references to figure numbers in Figure 7-3 .......................................................................... 78
4 Revision History Copyright © 2011–2014, Texas Instruments Incorporated
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