SLUUCN4A January 2023 – February 2024
The design of some battery charging systems may have a not insignificant impedance between the charger and battery terminals. In this case a voltage compensation feature handles system level IR drops to ensure the correct charging voltage is supplied at the battery terminals. Program the System Resistance register with the measured resistance in milliohms (mΩ) between the battery terminals and charger terminals. This feature is enabled by setting the configuration bit [COMP_IR] in (default 0) the Charging Configuration register.
This feature works as follows:
SBS.ChargingVoltage = Charging_Voltage + AverageCurrent() × System Resistance
where Charging_Voltage has been computed as a result of a selected configuration.