For bidirectional over current detection, TI recommends to utilize the VCSamp_Out circuit on the EVM. This circuit connects to VC1 and utilizes dedicated analog UV/OV comparators found within the BQ79631-Q1 device. While this method cannot be used to give precise readings on the voltage from Shunt(+) to Shunt(-), the method provides a quick response to any over current fault and can be instrumental in preventing catastrophic failures from arising within the system. In addition to over current detection, the VC1 measurement ADC can also be used as an alternate, less accurate, current measurement path. To enable the VCSamp_Out measurements to be made via VC1, simply place a shunt across pins 1 and 2 (top-middle) of J37.

The VCSamp_Out connection can be used simultaneously with the measurements being taken through SRP and SRN.