P9221-R Datasheet, PDF (23/35 Pages) Integrated Device Technology – Wireless Power Receiver

P9221-R Datasheet
10.3 Identification and Configuration Phase
The identification and configuration phase is the part of the protocol that the power transmitter executes in order to identify the power receiver
and establish a default power transfer contract. This protocol extends the digital ping in order to enable the power receiver to communicate
the relevant information.
In this phase, the power receiver identifies itself and provides information for a default power transfer contract:
 It sends the configuration packet.
 If the power transmitter does not acknowledge the request (does not transmit FSK modulation), the power receiver will assume 5W output
power.
10.4 Negotiation Phase
In the negotiation phase, the power receiver negotiates changes to the default power transfer contract. In addition, the power receiver verifies
that the power transmitter has not detected a foreign object.
10.5 Calibration Phase
In the calibration phase, the power receiver provides information that the power transmitter can use to improve its ability to detect foreign
objects during power transfer.
10.6 Power Transfer Phase
In this phase, the P9221-R controls the power transfer by means of the following control data packets:
 Control Error Packets
 Received Power Packet (RPP, FOD related)
 End Power Transfer (EPT) Packet
Once the “identification and configuration” phase is completed, the transmitter initiates the power transfer mode. The P9221-R control circuit
measures the rectifier voltage and sends error packets to the transmitter to adjust the rectifier voltage to the level required to maximize the
efficiency of the linear regulator and to send to the transmitter the actual received power packet for foreign object detection (FOD) to
guarantee safe, efficient power transfer.
In the event of an EPT issued by the application, the P9221-R turns off the LDO and continuously sends EPT packets until the transmitter
removes the power and the rectified voltage on the receiver side drops below the UVLO threshold.
© 2016 Integrated Device Technology, Inc.
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December 16, 2016