User's Manual
Table Of Contents
- 1 Device Overview
- Table of Contents
- 2 Revision History
- 3 Device Characteristics
- 4 Terminal Configuration and Functions
- 5 Specifications
- 6 Detailed Description
- 6.1 Overview
- 6.2 System Block Diagram
- 6.3 Power Supplies
- 6.4 Receiver – Analog Section
- 6.5 Receiver – Digital Section
- 6.6 Oscillator Section
- 6.7 Transmitter – Analog Section
- 6.8 Transmitter – Digital Section
- 6.9 Transmitter – External Power Amplifier and Subcarrier Detector
- 6.10 TRF7970A IC Communication Interface
- 6.11 Special Direct Mode for Improved MIFARE Compatibility
- 6.12 NFC Modes
- 6.13 Direct Commands from MCU to Reader
- 6.13.1 Command Codes
- 6.13.1.1 Idle (0x00)
- 6.13.1.2 Software Initialization (0x03)
- 6.13.1.3 Initial RF Collision Avoidance (0x04)
- 6.13.1.4 Response RF Collision Avoidance (0x05)
- 6.13.1.5 Response RF Collision Avoidance (0x06, n = 0)
- 6.13.1.6 Reset (0x0F)
- 6.13.1.7 Transmission With CRC (0x11)
- 6.13.1.8 Transmission Without CRC (0x10)
- 6.13.1.9 Delayed Transmission With CRC (0x13)
- 6.13.1.10 Delayed Transmission Without CRC (0x12)
- 6.13.1.11 Transmit Next Time Slot (0x14)
- 6.13.1.12 Block Receiver (0x16)
- 6.13.1.13 Enable Receiver (0x17)
- 6.13.1.14 Test Internal RF (RSSI at RX Input With TX ON) (0x18)
- 6.13.1.15 Test External RF (RSSI at RX Input with TX OFF) (0x19)
- 6.13.1.16 Receiver Gain Adjust (0x1A)
- 6.13.1 Command Codes
- 6.14 Register Description
- 7 Application Schematic and Layout Considerations
- 8 Device and Documentation Support
- 9 Mechanical Packaging and Orderable Information
TRF7970A
SLOS743K –AUGUST 2011–REVISED APRIL 2014
www.ti.com
7.2 TRF7970A Reader System Using SPI With SS Mode
7.2.1 General Application Considerations
Figure 7-2 shows the TRF7970A application schematic optimized for both ISO15693 and ISO14443
systems using the Serial Port Interface (SPI). Short SPI lines, proper isolation of radio frequency lines,
and a proper ground area are essential to avoid interference. The recommended clock frequency on the
DATA_CLK line is 2 MHz.
Figure 7-2 shows matching to a 50- Ω port, which allows connecting to a properly matched 50-Ω antenna
circuit or RF measurement equipment (for example, a spectrum analyzer or power meter).
An MSP430F2370 (32KB Flash, 2KB RAM) is shown in Figure 7-2. Minimum MCU requirements depend
on application requirements and coding style. If only one ISO protocol or a limited command set of a
protocol needs to be supported, MCU Flash and RAM requirements can be significantly reduced and user
should be aware that recursive inventory and anticollision commands require more RAM than single
slotted operations. For example, current reference firmware for ISO15693 (with host interface) is
approximately 8KB, using 512B RAM and for all supported protocols (also with same host interface) the
reference firmware is approximately 12KB and uses a minimum of 1KB RAM. An MCU capable of running
its GPIOs at 13.56 MHz is required for Direct Mode 0 operations.
76 Application Schematic and Layout Considerations Copyright © 2011–2014, Texas Instruments Incorporated
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