P9412 Ping Detect Design Guide

PublishTime：2023-04-25

●Abstract: This document explains the P9412 digital ping detect feature and the schematic connections needed to support Ping Detect (PDET). The Ping Detect feature enables the host Application Processor (AP) to have an interrupt driven method of determining whether the mobile device is currently placed on a valid transmitter. Many uses can be established related to knowing that a Tx is within charging distance and this information can enhance your experience. This guide explains how the feature works and the connections that are needed to implement PDET using the P9412.
●WPC Digital Ping and P9412 Ping Detect
■The P9412 has integrated the ability to provide an output to the host AP to indicate detection of a valid WPC digital ping event. The digital ping is used by the Tx to establish a wireless connection with the Rx following the WPC protocol for establishing power transfer. The standard digital ping lasts for 80ms and the digital ping interval varies from transmitter to transmitter, but typically occurs every 2 seconds or less. The following are the key benefits of the P9412 type of ping detect
▲The open-drain (OD) output generates a falling edge interrupt by driving low and requires no AP polling.
▲The Ping Detect solution uses an internal low-power clock and does not require any timing related components (such RC time constants).
▲This Ping Detect can adapt to various digital ping intervals automatically.
▲Ping detect is very low power (<1.8μW) when waiting for a Digital Ping detection
■The most common use of PDET is to conserve power after charging has completed. The wireless power connection to the TX can be ended using an End of Power Transfer (EPT) packet to save power while still having the option to top-off the battery periodically. The P9412 then indicates to the host Application Processor (AP) that it is still on the charging pad by using the PDETB (GPOD6 pin) and using the SW_Inhibit pin to prevent the P9412 from connecting to the Tx pad. The PDETB pin must be externally pulled up to the host 1.8V AP power supply rail and is held low if TX PING pulses are detected (or whenever a wireless power connection is active). If a time interval of about 5s passes from the previous digital ping to the next expected digital ping, the PDETB pin is released to indicate to the host AP that the wireless device has been removed from the Tx charging pad. Otherwise, the PDETB pin is held low while the Rx is detecting incoming Ping events. Proper operation of Ping Detect also requires 1.8V applied to V1P8AP and GPOD0 pulled to GND.

Brand of Product：	Renesas
Part#：	P9412 More Part#
Product Category：	evaluation board 、 digital ping More
Application：	More
Data Type：	Application note & Design Guide More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	Jul.21.20
Version Number：	Rev.1.0
Data Encoding：
Data Size：	686 KB

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