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BQ25730: BQ25730 VSYS VBAT

Star Xu
Genius 9645 points
Part Number: BQ25730

Hi 

The customer test with BQ25730. Get the voltages of VSYS and VBAT through the 0x2D2C register. The original 16bit value obtained is: 9E9Ch.

According to the parameters in the specification, LSB: 0.064V, then VSYS and VBAT are 10.112V and 9.984V respectively, but the actual measured voltage is 18.23 V.

what else needs to be configured?

Thanks

Star

  • 0
    TI__Expert 3335 points

    Hi Star,

    The VSYS and VBAT ADC output rage is 2.88 V - 19.2 V for 1S-4S and 8.16V - 24.48 V for 5S battery as outlined in datasheet section 9.6.10. This means ADC has offset of 2.88 V(or 8.16 V). You need to add this offset to the ADC reading. 

    9Eh x 64mV + 8.16V = 18.27V

    Best Regards,

    Munir