P9415-R datasheet(28/62 Pages) RENESAS

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P9415-R Datasheet

May 4, 2021

8.4 WattShareTM (TRx) Mode Functions

The P9415-R can be configured as a wireless power transmitter. The device uses an on-chip full/half-bridge inverter, a PWM generator, a

modulator/demodulator for communication, and a microcontroller to produce an AC power signal to drive external L-C tank to operate as a

wireless power transmitter (TRx). The P9415-R uses the same L-C tank in both Rx mode and TRx mode.

8.4.1 Enabling WattShareTM (TRx) Mode

In TRx mode, the power needs to be applied on the VOUT pin which is the same node as the power receiver output when the device operates

in Rx Mode. The Application processor (AP) must adhere to the following procedure to enable TRx mode.

1. AP must ensure that the VOUT pin is not connected to the battery charger. It must enable the power supply on VOUT.

2. AP waits for the interrupt register 0x30 bit 7 (TX_INIT_INT) that indicates TRx mode initialization is finished

3. AP writes 0x0001 to 0x0076 (2 bytes) to enable TRx mode.

The P9415-R starts sending digital pings after enabling TRx mode. The digital ping frequency is 145kHz and the normal operating frequency

range is from 130kHz to 145kHz in the default configuration. It can be changed to 110 – 148kHz using the P9415-R Wireless Power Pro GUI.

Figure 21. Enabling WattShareTM (TRx) Mode

AC1

AC2

PGND

VRECT

VOUT

SCL

P9415-R

SDA

/INT

Battery

Charger

Application

Processor

Boost

Regulator

Power

Smart Phone/ Receiver Device

Power

Wireless Power

Receiver

P9222-R

DC Output for

Battery

charging

8.4.2 WattShareTM Mode Input Voltage

The P9415-R can transfer up to 5W of power in TRx mode. It follows the WPC 1.2.4 BPP protocol to transfer the power to other Qi-certified

receivers such as Mobile devices and Earbud charging cases. The maximum power delivered in TRx mode is dependent on the input voltage

on VOUT pin, coil characteristics such as AC resistance, and the friendly metal around the coil. Because the coil used for power transfer in

TRx mode has high AC resistance compared to transmitter coil used in a charging pad, the input voltage on the VOUT pin in TRx mode must

be around 7 to 9V to deliver 5W of power to the receiver.

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