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AS3910

Data Sheet - C o n t e n t s

8.9.9 FIFO Water Level and FIFO Status Register ............................................................................................................................. 20

8.10 Direct Commands

............................................................................................................................................................................ 20

8.10.1 Set Default ............................................................................................................................................................................... 21

8.10.2 Clear ........................................................................................................................................................................................ 21

8.10.3 Transmit Commands ............................................................................................................................................................... 21

8.10.4 NFC Transmit Commands ....................................................................................................................................................... 21

8.10.5 Mask Receive Data and Unmask Receive Data ...................................................................................................................... 22

8.10.6 AD Convert .............................................................................................................................................................................. 22

8.10.7 Measure RF ............................................................................................................................................................................. 22

8.10.8 Squelch .................................................................................................................................................................................... 22

8.10.9 Clear Squelch .......................................................................................................................................................................... 22

8.10.10 Adjust Regulators .................................................................................................................................................................. 22

8.10.11 Calibrate Modulation Depth ................................................................................................................................................... 23

8.10.12 Calibrate Antenna .................................................................................................................................................................. 23

8.10.13 Check Antenna Resonance ................................................................................................................................................... 23

8.10.14 Clear RSSI ............................................................................................................................................................................. 23

8.10.15 Transparent Mode ................................................................................................................................................................. 23

8.11 Registers

.......................................................................................................................................................................................... 23

8.11.1 Main Registers ......................................................................................................................................................................... 24

8.11.2 Configuration Registers ........................................................................................................................................................... 25

8.11.3 Interrupt Register and Associated Registers ........................................................................................................................... 28

8.11.4 A/D Converter Output Register ................................................................................................................................................ 30

8.11.5 Antenna Calibration Registers ................................................................................................................................................. 31

8.11.6 AM Modulation Depth and Antenna Driver Registers .............................................................................................................. 32

8.11.7 NFCIP Field Detection Threshold Register .............................................................................................................................. 33

8.11.8 Regulator Registers ................................................................................................................................................................. 35

8.12 Typical Operating Sequence ............................................................................................................................................................ 37

8.12.1 ISO-14443 Reader Operation .................................................................................................................................................. 37

8.12.2 NFCIP-1 Operation .................................................................................................................................................................. 37

8.13 ISO-14443A SELECT SEQUENCE

................................................................................................................................................. 38

8.13.1 REQA and WUPA .................................................................................................................................................................... 38

8.13.2 ANTICOLLISION ..................................................................................................................................................................... 39

8.13.3 Collision Detection ................................................................................................................................................................... 39

8.13.4 SELECT ................................................................................................................................................................................... 39

8.14 Receiving 4Bit Tag Response Frame ............................................................................................................................................... 40

8.15 AM Modulation Depth: Definition and Calibration

............................................................................................................................ 40

8.15.1 AM Modulation Depth Definition Using Direct Command Calibrate Modulation Depth ........................................................... 40

8.15.2 AM Modulation Depth Definition Using Antenna Driver AM Modulated Level Definition Register (#12) ................................. 41

8.16 Antenna LC Tank Resonance: Checking and Calibration

................................................................................................................ 41

8.16.1 Check Antenna Resonance ..................................................................................................................................................... 42

8.16.2 Calibrate Antenna Resonance ................................................................................................................................................. 42

8.17 Transparent Mode ............................................................................................................................................................................ 43

8.18 Active Receive – Use in ISO-14443B Anticollision

.......................................................................................................................... 44

8.19 ISO-14443B, Reduction of TR0 and TR1 and Suppression of EOF/SOF in PICC Response

......................................................... 44

8.20 Test Pins ........................................................................................................................................................................................... 44

9 Package Drawings and Markings ........................................................................................................................................... 45

10 Ordering Information ............................................................................................................................................................. 47