SLUSFK8 April 2024 BQ25770G
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
The charger monitors the battery charge current to provide the battery overcurrent charge protection(BATCOC) through voltage across SRP and SRN. BATCOC is disabled by default (BATCOC_CONFIG=00b) and can be enabled by configuring BATCOC_CONFIG=01b/10b/11b (50mV/75mV/100mV thresholds respectively).
When the charge current is higher than the threshold after 1-μs deglitch time, BATCOC fault is triggered, CHARGE_CURRENT() register is reset back to 0A and BATFET should be turned off accordingly. Status bit FAULT_BATCOC is set and it can only be cleared by host read after 1 second latch time. The above actions are only executed one time after triggered. During this 1 second latch time, non-zero value cannot be written into CHARGE_CURRENT(). In order to recover charging, host need to re-write non-zero CHARGE_CURRENT() register value after it triggers for 1 second. Note this protection only turns off BATFET to disable charge it should not influence BATFET supplement mode turn on state machine. Also the CHRG_OK pin is not influenced under BATCOC fault to avoid unnecessary interference to customer system.