SLUUBT5C November 2018 – June 2021 BQ40Z80
A voltage compensation scheme is required to handle system level IR drops to ensure the correct voltage level required for a specific charging voltage at the battery terminals. Where ‘R’ is the added “system level” resistance, the user would program in the System Resistance register. This feature is enabled by setting the configuration bit [COMP_IR] in (default 0) the Charging Configuration register.
This scheme will work as follows:
SBS.ChargingVoltage = Nominal_Charging_Voltage + IR