SLUSEK7 September 2024 BQ25773
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
Under battery only OTG operation, the charger monitors the battery discharge current to provide the battery over current protection (BATDOC) through voltage across SRN and SRP. BATDOC can be enabled by configuring EN_BATDOC=1b. BATDOC threshold is selected either 200% of IDCHG_TH2 or 300% IDCHG_TH2 through BATDOC_VTH bit. There is also fixed low and high clamp for BATDOC threshold. When 200% of IDCHG_TH2 or 300% IDCHG_TH2 corresponding SRN-SRP voltage is below 50 mV , then BATDOC threshold will be low clamped at SRN-SRP=50 mV corresponding current; similarly if 200% of IDCHG_TH2 or 300% IDCHG_TH2 corresponding SRN-SRP voltage is above 180 mV , then BATDOC threshold will be high clamped at SRN-SRP=180 mV corresponding current.
When discharge current is higher than the threshold after 250-μs deglitch time, BATDOC fault is triggered, status bit FAULT_BATDOC is set accordingly. Converter shuts down when BATDOC is asserted to disable OTG operation and reduce discharge current. BATFET status is not impacted if need to supplement power to system.
BATDOC is not a latch fault, therefore after BATDOC fault is removed, with 250 ms relax time, converter resume switching automatically. But status bit FAULT_BATDOC is only cleared by host read.