BQ78350-R1: How to read capacity after shutdown?

Hi,

During Shutdown, the BQ76940 receives the Shutdown command from the BQ78350-R1 and then powers down the REGOUT which turns off the BQ78350-R1. When the BQ78350-R1 comes out of Shutdown, it will no longer have the previous Remaining Capacity so it will estimate the SOC based on the cell voltages.

To get the most accurate SOC estimate based on cell voltages, the correct ChemID for your battery should be selected. The process of selecting the ChemID is covered in Section 2.3 of the Using the BQ78350-R1 app note: http://www.ti.com/lit/pdf/slua924

Section 9.1.4 of the BQ78350-R1 Technical Reference Manual goes into more detail on how Remaining Capacity is estimated initially. There is a data flash parameter RemCap Init Percent that can be used to scale the initial value as well.

Best regards,

Matt