P9242-R3/RB Datasheet

© 2019 Integrated Device Technology, Inc.

2

May 17, 2019

Contents

1. Pin Assignments...........................................................................................................................................................................................5

2. Pin Descriptions............................................................................................................................................................................................6

3. Absolute Maximum Ratings..........................................................................................................................................................................8

4. Electrical Characteristics ..............................................................................................................................................................................9

5. Typical Performance Characteristics..........................................................................................................................................................11

6. Functional Block Diagram...........................................................................................................................................................................13

7. Theory of Operation....................................................................................................................................................................................14

7.1 Foreign Object Detection (FOD)........................................................................................................................................................14

7.2 Configuring Foreign Object Detection and Over-Current Limit – ILIM/FOD Pin ................................................................................14

7.3 Enable Pin – EN ................................................................................................................................................................................16

7.4 Voltage Demodulation – VDEM1 Pin.................................................................................................................................................16

7.5 Current Demodulation – IDEMI Pin ...................................................................................................................................................16

7.6 Thermal Protection ............................................................................................................................................................................17

7.7 External Temperature Sensing – TS Pin...........................................................................................................................................17

7.8 Q-Factor and LED Pattern Selection – LED/Q-Fact Pin....................................................................................................................18

7.9 Step-Down Regulator ........................................................................................................................................................................19

7.10 Linear Regulators – PREG, LDO33, and LDO18 Pins ......................................................................................................................19

7.11 Under-Voltage Lock-Out (UVLO) Protection......................................................................................................................................19

7.12 LC Resonant Circuit ..........................................................................................................................................................................20

7.13 External Memory ...............................................................................................................................................................................20

8. Communication Interface............................................................................................................................................................................21

8.1 Modulation/Communication...............................................................................................................................................................21

8.2 Bit Encoding Scheme for FSK...........................................................................................................................................................21

8.3 Bit Decoding Scheme for ASK...........................................................................................................................................................22

8.4 Byte Decoding for ASK......................................................................................................................................................................22

8.5 Packet Structure................................................................................................................................................................................22

9. Bi-Directional User Data Communication...................................................................................................................................................23

9.1 Transferring Data from the P9242-R3 to the P9221-R3....................................................................................................................23

9.2 Reading Data Sent from the P9221-R3.............................................................................................................................................26

10. WPC Mode Characteristics ........................................................................................................................................................................28

10.1 Selection Phase.................................................................................................................................................................................28

10.2 Ping Phase (Digital Ping)...................................................................................................................................................................28

10.3 Identification and Configuration Phase..............................................................................................................................................29

10.4 Negotiation Phase .............................................................................................................................................................................29

10.5 Calibration Phase ..............................................................................................................................................................................29

10.6 Power Transfer Phase.......................................................................................................................................................................29

11. Functional Registers...................................................................................................................................................................................30

12. Application Information...............................................................................................................................................................................35