STWBC86 Disable ping while receiver is still on charger

[brunohenriques]

Hello,

I'm developing a charging solution using the STWBC86 controller - is it possible to disable the reping after a received EPT packet from the receiver device (GUI setting: TX EPT PING DIS EX EPT) only while it detects the presence of a receiving device?

Currently, if reping is disabled, after receiving the EPT packet from the receiver, the transmitter will not reping until being reset or via I2C commands, regardless if the receiver is removed from the charger. The use case here would be for the receiving device to be able to terminate the power transfer and the transmitter wouldn't attempt to restart the power transfer until the receiving device is removed from the charger.

[Didier HERROUIN]

Hello,

No, the EPT behavior has been specified by the Qi standard: an EPT message to Tx must stop the power transfer:

• If the reping is disabled, the power transfer should not re-star
• If the reping is enabled, the STWBC86 will re-start a normal reping after ~2s

If you design your own Rx (based on STWLC38 for instance), the Host MCU can disable the Rx ASK communication by driving "high" a GPIO: The Tx will stop transmitting the power after few seconds (as it does not receive any response), and it will start pinging. Note that this delay can be reduced by sending an EPT before.
When the Rx MCU consider that charging must re-start, it just has to set back the GPIOx to "low".

Regards,

Didier

[willzhou]

Hi Sir

Your requirement is not a standard QI requirement and requires customized software development.