P9242-R Datasheet

© 2018 Integrated Device Technology, Inc

24

January 16, 2018

9.3 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 transmitter identifies itself and receives information for a default power transfer contract as follows:

It receives the configuration packet.

If the Neg bit in the received configuration packet is set to ZERO, the power transmitter should proceed to the power transfer phase

without sending a response for baseline power profile.

If the Neg bit in the received configuration packet is set to ONE, subsequently the power transmitter should proceed to the negotiation

phase for the extended power profile.

9.4 Negotiation Phase

In the negotiation phase, the power receiver negotiates with the power transmitter to fine-tune the power transfer contract. The power receiver

sends negotiation requests to the power transmitter, which the power transmitter can grant or deny. In addition, to improve its initial assessment

of whether foreign objects are present, the power transmitter can compare the quality factor reported by the power receiver with its own

measurement. If the power transmitter detects a foreign object, it should return the selection phase.

9.5 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.

9.6 Power Transfer Phase

In this phase, the P9242-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 receiver`s control circuit

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, when the receiver sends EPT packets, the transmitter terminates the power transfer.