The device provides an autocalibration feature that will measure the voltage offset error across SRP and SRN from time-to-time as operating conditions change. It subtracts the resulting offset error from normal sense resistor voltage, V_SR, for maximum measurement accuracy.

The gas gauge performs a single offset calibration when:

1. The interface lines stay low for a minimum of Bus Low Time and
2. V_SR > Deadband.

The gas gauge also performs a single offset when:

1. The condition of AverageCurrent() ≤ Autocal Min Current and
2. {Voltage change since last offset calibration ≥ Delta Voltage} or {temperature change since last offset calibration is greater than Delta Temperature for ≥ Autocal Time}.

Capacity and current measurements should continue at the last measured rate during the offset calibration when these measurements cannot be performed. If the battery voltage drops more than Cal Abort during the offset calibration, the load current has likely increased considerably; hence, the offset calibration will be aborted.