P9415-R datasheet(23/62 Pages) RENESAS

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P9415-R Datasheet

May 4, 2021

The P9415-R uses advanced FOD techniques to detect foreign objects placed on or near the transmitter base station. The FOD algorithm

includes values that are programmable through either the I2C interface or MTP (Multi-Time Programmable) bits. Programmability is necessary

so that the FOD settings can be optimized to match the power transfer characteristics of each particular WPC system to include the power

losses of the Tx and Rx coils, battery, shielding, and case materials under no load to full load conditions. The values are based on the

comparison of the received power against a reference power curve so that any foreign object can be sensed when the received power is

different than the expected system power.

The P9415-R FOD values need to be tuned before production for WPC compliance using final production hardware and coils.

8.2.4 Status/Interrupt Output

When the power transfer connection is established and stable, the VOUT LDO is enabled. GPOD and GPIO pins can be connected to the AP

to perform status and interrupt commands.

8.2.5 WPC Modulation/Communication

The P9415-R operates in WPC using a single LC tank Rx coil and requires AC modulation capacitor connections for WPC communication. The

LC tank also should be tuned to achieve maximum efficiency (CMA, CMB, CM1, CM2 connected to pins CMA, CMB COM1, COM2) in order to

accomplish WPC modulation.

Figure 16. Rx Modulation Components

AC1

AC2

CMA

COM2

LDO VOUT

CMA

CM2

VRECT

COM1

CM1

CMB

Receiver-to-transmitter communication is completed by modulating the load applied to the receiver's inductor. To the transmitter, this appears

as an impedance change, which results in measurable variations of the transmitter’s output waveform. Modulation is done with AC Modulation,

using internal switches to connect external capacitors from AC1 and AC2 to ground.

The P9415-R communicates with the base via communication packets or decodes messages sent by WPC Rx’s. Each communication packet

has the following structure:

Figure 17. Communication Packet Structure

Preamble

Header

Message

Checksum

According to the WPC specification, the power receiver communicates with the power transmitter using backscatter modulation. The load seen

by the power transmitter’s inductor is modulated on the receiver side to send packets. The power transmitter demodulates these signals as a

modulation of coil current/voltage to decode and receive packets.

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