SLOA192B April 2014 – March 2019 TRF7970A , TRF7970A
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NFC active and passive peer-to-peer communication using the TRF7970A
- Trademarks
- 1 Introduction
- 2 Initial RF Collision
- 3 TRF7970A Register Settings
- 4 Peer-to-Peer at 106 kbps
- 5 Peer-to-Peer at 212 kbps and 424 kbps
- 6 Hardware Description
- 7 Passive and Active Peer-to-Peer Firmware Example
- 8 Quick Start Guide
- 9 Operational Overview
- 10 Peer-to-Peer Interoperability Results
- 11 Conclusion
- 12 References
- Revision History
4 Peer-to-Peer at 106 kbps
The TRF7970A supports initiator and target P2P mode at 106 kbps (fc/128). When the transceiver is in default mode [ISO mode (for more information, see the Direct Mode section of [1])] only the decoded data is available to the MCU through the FIFO. The frame format for Data Exchange Protocol (DEP) packets at 106 kbps (shown in Figure 6) are based on the NFC-A technology specified in the NFCForum-TS-DigitalProtocol-1.0. The format does not include the Start Byte for the passive anticollision of 106 kbps. This section covers the register settings and anticollision sequence for both the active and passive peer-to-peer modes at 106 kbps.
Figure 6. Frame Format for 106 kbps 
Figure 7. Peer-to-Peer 106-kbps Flow Diagram