ZHCSF78E June 2016 – April 2019 BQ35100
PRODUCTION DATA.
The device measures the BAT input using the integrated delta-sigma ADC, which is scaled by the internal translation network, through the ADC. The translation gain function is determined by a calibration process.
In systems where the battery voltage is greater than VIN(BAT) MAX (for example, 2-series cell or more), then an external voltage scaling circuit is required. The firmware then scales this <1 V value to reflect an average cell value and then again by the number of series cells to reflect the full battery voltage value.