User's Manual

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 Ω ...... 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
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