Hi
We have a wearable device using BQ51050B for wireless charging. and we are experiencing a production issue, visible so far on 5 % of devices.
When the battery gets fully depleted ( protection circuit opened ) the system is not able to boot.
In this fully depleted situation I see a saw-tooth voltage waveform around 2.5V on the battery voltage node during precharge were the voltage steadily increase first and suddenly drops after.
When the battery gets fully depleted ( protection circuit opened ) the system is not able to boot.
In this fully depleted situation I see a saw-tooth voltage waveform around 2.5V on the battery voltage node during precharge were the voltage steadily increase first and suddenly drops after.
Bottom line the voltage never reach 3 V so the battery protection circuit apparently never re-open.
Do you have any logic that would shutdown and resume the precharge current?
