AS3910
Data Sheet - Contents
Contents
1 General Description .................................................................................................................................................................. 1
2 Key Features ............................................................................................................................................................................ 1
3 Applications .............................................................................................................................................................................. 1
4 Pin Assignments ....................................................................................................................................................................... 5
4.1 Pin Descriptions ...................................................................................................................................................................................5
5 Absolute Maximum Ratings ...................................................................................................................................................... 7
6 Electrical Characteristics .......................................................................................................................................................... 8
7 Detailed Description ............................................................................................................................................................... 10
7.0.1 Transmitter .................................................................................................................................................................................11
7.0.2 Receiver .....................................................................................................................................................................................11
7.0.3 Phase and Amplitude Detector .................................................................................................................................................. 11
7.0.4 A/D Converter ............................................................................................................................................................................ 11
7.0.5 External Field Detector .............................................................................................................................................................. 11
7.0.6 Quartz Crystal Oscillator ............................................................................................................................................................11
7.0.7 Power Supply Regulators .......................................................................................................................................................... 11
7.0.8 POR and Bias ............................................................................................................................................................................ 11
7.0.9 ISO-14443 and NFCIP Framing ................................................................................................................................................12
7.0.10 FIFO ......................................................................................................................................................................................... 12
7.0.11 Control Logic ............................................................................................................................................................................ 12
7.0.12 SPI Interface ............................................................................................................................................................................ 12
8 Application Information ........................................................................................................................................................... 13
8.1 Operating Modes ................................................................................................................................................................................13
8.2 Transmitter ......................................................................................................................................................................................... 13
8.3 Receiver .............................................................................................................................................................................................13
8.3.1 Gain Reduction, AGC and Squelch ........................................................................................................................................... 14
8.3.2 RSSI .......................................................................................................................................................................................... 14
8.3.3 AM and PM Demodulation ......................................................................................................................................................... 14
8.4 A/D Converter .................................................................................................................................................................................... 14
8.5 Phase and Amplitude Detector .......................................................................................................................................................... 15
8.5.1 Phase Detector ..........................................................................................................................................................................15
8.5.2 Amplitude Detector ....................................................................................................................................................................15
8.6 External Field Detector ....................................................................................................................................................................... 15
8.6.1 Target Activation Detector ......................................................................................................................................................... 15
8.6.2 RF Collision Avoidance Detector ...............................................................................................................................................15
8.7 Quartz Crystal Oscillator ....................................................................................................................................................................15
8.8 Power Supply, Regulators ..................................................................................................................................................................16
8.9 Communication to External Microcontroller .......................................................................................................................................16
8.9.1 Serial Peripheral Interface (SPI) ................................................................................................................................................17
8.9.2 SPI Operation MODE Bits ......................................................................................................................................................... 17
8.9.3 Writing of Data to Addressable Registers (WRITE Mode) .........................................................................................................17
8.9.4 Reading of Data from Addressable Registers (READ Mode) ....................................................................................................18
8.9.5 Sending Direct Commands ........................................................................................................................................................ 19
8.9.6 Loading Transmitting Data into FIFO .........................................................................................................................................19
8.9.7 Reading Received Data from FIFO ........................................................................................................................................... 19
8.9.8 Interrupt Interface ...................................................................................................................................................................... 19
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