CRX14_10 Datasheet, PDF (5/47 Pages) STMicroelectronics – ISO14443 type-B contactless coupler chip with anti-collision, CRC management and anti-clone function

CRX14
List of figures
List of figures
Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 2. Logic block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 3. SO pin connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4.
Figure 5.
Figure 6.
CRX14 application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Maximum R_L value versus bus capacitance (C_BUS) for an I^²C bus . . . . . . . . . . . . . . . . . . 11
I²C bus protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 7. CRX14 I²C write mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 8. I²C polling flowchart using ACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 9. CRX14 I²C read modes sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 10. Host-to-CRX14 transfer: I²C write to parameter register . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 11. CRX14-to-host transfer: I²C random address read from parameter register . . . . . . . . . . . 22
Figure 12. CRX14-to-host transfer: I²C current address read from parameter register . . . . . . . . . . . 22
Figure 13. Host-to-CRX14 transfer: I²C write to I/O frame register for ISO14443B . . . . . . . . . . . . . . 23
Figure 14. CRX14-to-host transfer: I²C random address read from I/O frame register for
ISO14443B 23
Figure 15. CRX14-to-host transfer: I²C current address read from I/O frame register
for ISO14443B 24
Figure 16. Host-to-CRX14 transfer: I²C write to slot marker register . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 17. CRX14-to-host transfer: I²C random address read from slot marker register . . . . . . . . . . 25
Figure 18. CRX14-to-host transfer: I²C current address read from slot marker register . . . . . . . . . . . 25
Figure 19. Wave transmitted using ASK modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 20. CRX14 request frame character format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 21. Request start of frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 22. Request end of frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 23. Wave received using BPSK sub-carrier modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 24. Answer start of frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 25. Answer end of frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 26. Example of a complete transmission frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 27. CRC transmission rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 28. Standard TAG command: request frame transmission. . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 29. Standard TAG command: answer frame reception . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 30. Standard TAG command: complete TAG access description. . . . . . . . . . . . . . . . . . . . . . . 32
Figure 31. Anti-collision ST short range memory sequence (1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 32. Anti-collision ST short range memory sequence continued . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 33. I²C AC testing I/O waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 34. I²C AC waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 35. CRX14 synchronous timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 36. SO16 narrow - 16 lead plastic small outline, 150 mils body width, package outline. . . . . . 42
Doc ID 8880 Rev 4
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