BQ27427: max battery capacity parameter

Ben Genereaux

Part Number: BQ27427

Hi team,

Where does the Battery capacity (max) (mAh) parameter get derived from from for TI fuel gauges? What would the impact be on the performance if for example an 8200mAh singe cell battery was used with BQ27427?

Thanks,
Ben

over 1 year ago

0 Jose Couso over 1 year ago

TI__Mastermind 27321 points

Hello,

I am assigning this thread to the expert of the device.

Regards,
Jose Couso

0 Dominik Hartl11 over 1 year ago

TI__Guru 61536 points

This is related to Design Energy. The gauge uses integer math (16-bit signed) so 32767 mWh / 8000mAh = 4096mV, which is a typical single cell voltage. The gauge uses energy calculations internally so if you increase Design Capacity, then energy calculation may saturate.

Also, 8200mAh is a large cell with typical system currents likely exceeding the limit for the built in sense resistor.

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BQ27427: max battery capacity parameter