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AS3910

Data Sheet - C o n t e n t s

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