P9221-R3 Datasheet

© 2017 Integrated Device Technology, Inc.

2

October 20, 2017

Contents

1.

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

2.

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

3.

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

4.

Thermal Characteristics................................................................................................................................................................................9

5.

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

6.

Typical Performance Characteristics..........................................................................................................................................................12

7.

Functional Block Diagram...........................................................................................................................................................................15

8.

Theory of Operation....................................................................................................................................................................................16

8.1

LDO – Low Dropout Regulators.......................................................................................................................................................16

8.2

Setting the Output Voltage and Reference Q-factor Value – VOSET/Q-Fact ..................................................................................16

8.3

SINK Pin ..........................................................................................................................................................................................17

8.4

Rectifier Voltage – VRECT...............................................................................................................................................................17

8.5

Over-Current Limit – ILIM.................................................................................................................................................................17

8.6

Interrupt Function – INT ...................................................................................................................................................................18

8.7

Enable Pin – EN...............................................................................................................................................................................18

8.8

Thermal Protection...........................................................................................................................................................................18

8.9

External Temperature Sensing and End of Charge – TS/EOC........................................................................................................18

8.10 Alignment Guide – ALIGNX and ALIGNY ........................................................................................................................................18

8.11 Advanced Foreign Object Detection (FOD) .....................................................................................................................................19

8.12 Received Power Packet Offset and Gain Calibration – RPPO and RPPG ......................................................................................20

9.

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

9.1

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

9.2

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

9.3

Bit Encoding Scheme for ASK .........................................................................................................................................................22

9.4

Byte Encoding for ASK.....................................................................................................................................................................22

9.5

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

10. Bi-directional User Data Communication....................................................................................................................................................23

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

10.2 Reading Data Sent from the P9242-R3 to the P9221-R3 ................................................................................................................26

11. WPC Mode Characteristics ........................................................................................................................................................................28

11.1 Selection Phase or Startup ..............................................................................................................................................................28

11.2 Ping Phase (Digital Ping) .................................................................................................................................................................28

11.3 Identification and Configuration Phase ............................................................................................................................................29

11.4 Negotiation Phase............................................................................................................................................................................29

11.5 Calibration Phase.............................................................................................................................................................................29

11.6 Power Transfer Phase .....................................................................................................................................................................29

12. Functional Registers...................................................................................................................................................................................30

13. Application Information ...............................................................................................................................................................................37