Other Parts Discussed in Thread: BQ50002A, BQ50002
With the latest test batch of boards we found we would get an error indication ( RED LED indicated on board ). When I checked the EPT code it comes back 00 which I believe means unknown error. It shuts down all charging, waits 5 minutes and then starts up again.
I have checked the voltage rails going into the design and everything looks fine. Absolute worst case I get 200mV drop on a 5.1V input.
It seems to happen when the charging coil - Wurth coil 760308100111 is approx. 6mm away or there abouts from a phone. We have reproduced this with Samsung S8, Samsung S7, Samsung S6, Samsung S5 with 3rd party back cover, Apple iphone 6 with 3rd party back cover.
With the fault condition not happening for hours at a time it is difficult to fault find and with no EPT code I am not sure what other information I can extract to understand the fault?
Any help would be appreciated.