SLUSDF9 June 2020 BQ25790
BQ25790 provides a high-accuracy battery charging / discharging current sensing pin, IBAT. It outputs a 25 µA current when the battery charging / discharging current is 1 A. The IBAT pin output is valid when either VBUS or VBAT voltage is higher than its own ULVO voltage, and EN_IBAT register bit is set to 1. The IBAT pin only provides the battery charging current in forward charging mode and the battery discharging current at battery only condition or OTG mode. When the charger is operated in forward charging mode, the output of the IBAT pin becomes zero when the battery is turning into the supplement mode.