Part Number:BQ27531-G1
I've got a battery charger circuit using the BQ27531-G1 and BQ24192. The battery thermister is connected to the gas gauge, so that we can accurately control the charging current and voltage based on battery temperature. This is also used to stop charging if the battery is over a safe temperature. By configuring the gas gauge with the GG_CHGRCTL_ENABLE command, it safely stops charger from charging when the temperature exceeds a safe range. This is all working as intended.
However, if the battery dies or is disconnected, and then the device is plugged in to charge while turned off (host processor off), then the gas gauge stops updating the charger, allowing it to charge beyond the safe temperature. It's only after the processor is turned on and the GG_CHGRCTL_ENABLE command is sent, that it behaves safely. So is there anyway to make the GG_CHGRCTL_ENABLE on by default without the host processor enabling it? We tried having a separate thermister for the charger(located on the PCB), but when the device is on the PCB gets hotter than the battery, thereby stopping charging pre-maturely.
If this can't be done, is there a why that will work properly only using the battery thermister?
Thanks in advance,
Kenzie