SLUUB65B May 2015 – December 2022
The integrating delta-sigma ADC in the BQ27542-G1 measures the charge/discharge flow of the battery by measuring the voltage drop across a small-value sense resistor between the SRP and SRN pins. The 15-bit integrating ADC measures bipolar signals from –0.125 V to 0.125 V with 10-μV resolution. The gauge reports charge activity when VSR = V(SRP) – V(SRN) is positive, and discharge activity when VSR = V(SRP) – V(SRN) is negative. The BQ27542-G1 continuously monitors the measured current and integrates the digital signal over time using an internal counter. The data reported through the Current() can also have a deadband applied to it. This removes any noise or offset that has not been calibrated out from being reported as real current.