The BQ76907 integrates two Overcurrent in Discharge Protections (OCD1, OCD2) using a comparator that monitors the differential voltage across the SRN - SRP pins and triggers an OCD1 or OCD2 alert or fault when the voltage exceeds a programmable threshold VOCD1 and VOCD2, respectively. The VOCD1/2 thresholds are programmable from 4 mV to 200 mV in 2 mV steps using the Protections:Current:Overcurrent in Discharge 1 Protection Threshold and Protections:Current:Overcurrent in Discharge 2 Protection Threshold configuration registers. These two protections operate identically, but can have independent threshold and delay settings. The OCD1 and OCD2 protections are enabled using the Settings:Protection:Enabled Protections A:[OCD1] and [OCD2] configuration bits.

The OCD1/2 circuitry triggers an alert signal when an overcurrent in discharge event is first detected, then triggers a fault if it persists for a programmable detection delay, OCD1_DLY or OCD2_DLY, which can be set as shown below.

The delay is set by the Protections:Current:Overcurrent in Discharge 1 Protection Delay and Protections:Current:Overcurrent in Discharge 2 Protection Delay configuration registers.

When an OCD fault is triggered, the device turns off the DSG FET if configured for autonomous FET control in Settings:Protection:DSG FET Protections A[OCD1, OCD2]. The device recovers after a programmable delay given by Protections:Current:Recovery Time, which can be set from 1-sec to 255-sec in 1-sec steps. A recovery time setting of 0 disables autonomous recovery, in which case recovery only occurs when the PROT_RECOVERY() command is sent from the host with the appropriate [OCD1REC] or [OCD2REC] bit set. Continual retrying of time-based recovery can be avoided by using the Current Protection Latch feature.