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
Table 6-26. ISO Control Register (0x01) (continued)
NFC:
B2 iso_2 RFID / Card Emulation
0 = NFC Normal Modes
1 = Card Emulation Mode
NFC:
B1 iso_1 RFID / NFC bit rate
0 = bit rate selection or card emulation selection, see Table 6-28
NFC:
B0 iso_0 RFID / NFC bit rate
0 = bit rate selection or card emulation selection, see Table 6-28
Table 6-27. ISO Control Register ISO_x Settings, RFID Mode
ISO_4 ISO_3 ISO_2 ISO_1 ISO_0 Protocol Remarks
0 0 0 0 0 ISO15693 low bit rate, 6.62 kbps, one subcarrier, 1 out of 4
0 0 0 0 1 ISO15693 low bit rate, 6.62 kbps, one subcarrier, 1 out of 256
0 0 0 1 0 ISO15693 high bit rate, 26.48 kbps, one subcarrier, 1 out of 4 Default for reader
0 0 0 1 1 ISO15693 high bit rate, 26.48 kbps, one subcarrier, 1 out of 256
0 0 1 0 0 ISO15693 low bit rate, 6.67 kbps, double subcarrier, 1 out of 4
0 0 1 0 1 ISO15693 low bit rate, 6.67 kbps, double subcarrier, 1 out of 256
0 0 1 1 0 ISO15693 high bit rate, 26.69 kbps, double subcarrier, 1 out of 4
ISO15693 high bit rate, 26.69 kbps, double subcarrier,
0 0 1 1 1
1 out of 256
0 1 0 0 0 ISO14443A RX bit rate, 106 kbps RX bit rate
(1)
0 1 0 0 1 ISO14443A RX high bit rate, 212 kbps
0 1 0 1 0 ISO14443A RX high bit rate, 424 kbps
0 1 0 1 1 ISO14443A RX high bit rate, 848 kbps
0 1 1 0 0 ISO14443B RX bit rate, 106 kbps RX bit rate
(1)
0 1 1 0 1 ISO14443B RX high bit rate, 212 kbps
0 1 1 1 0 ISO14443B RX high bit rate, 424 kbps
0 1 1 1 1 ISO14443B RX high bit rate, 848 kbps
1 0 0 1 1 Reserved
1 0 1 0 0 Reserved
1 1 0 1 0 FeliCa 212 kbps
1 1 0 1 1 FeliCa 424 kbps
(1) For ISO14443A/B, when bit rate of TX is different from RX, settings can be done in register 0x02 or 0x03.
Table 6-28. ISO Control Register ISO_x Settings,
NFC Mode (B5 = 1, B2 = 0) or Card Emulation (B5 = 1, B2 = 1)
NFC Card Emulation
ISO_1 ISO_0
(B5 = 1, B2 = 0) (B5 = 1, B2 = 1)
0 0 N/A ISO14443A
0 1 106 kbps ISO14443B
1 0 212 kbps N/A
1 1 424 kbps N/A
58 Detailed Description Copyright © 2011–2014, Texas Instruments Incorporated
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