SLUUBD4A April 2016 – November 2022 BQ27220
Requests the fuel gauge to take an open-circuit voltage (OCV) reading. This command can only be issued after the OPERATION_STATUS()[INITCOMP] bit is set, indicating the initialization has been completed. The OCV measurement takes place at the beginning of the next repeated 1-s firmware synchronization clock. If the Operation Config A [INT_OCV] bit is set, the SOC_INT pin pulses for approximately 512 ms if BATG_EN is 0, or 380 ms if BATG_EN is 1. (See also Table 5-6.) See Chapter 8, Open-Circuit Voltage Measurement Background, for more details on OCV measurements and recommended usage of this command.
The BatteryStatus()[OCVFAIL] bit is set if the OCV_CMD() subcommand is received when the BatteryStatus()[CHGINH] bit is set.