This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

bq2060A, significant difference found between VFC Sense Resistor and ADC Sense resistor

Other Parts Discussed in Thread: BQ2060A

    Usually, in Bq2060A, ADC Sense Resistor and VFC Sense resistor are vey close to each other, but for some bq2060A on customer's PCM, after the current is calibrated, the VFC Sense Resistro and ADC Sense Resister valure are very different,

    In one PCM, ADC Sense resistor is around 20milliOhm, and VFC Sense Resistor  is around 84milliOhm, in another circuit, the ADC Sense Resistor is about 30 milliOhm, but VFC sense resistor is about 35milliOhm, after move the ICs on these PCMs to other good PCMs, the issue is gone, how could PCM circuit cause such big error between this two values?

 

  • Steven,

    A bad VFC offset value is the issue..  The value shown in your screen shot for VFC offset shows 0xA0002, which will cause the VFC to think a very large current is flowing.  Please perform VFC offset first, or at least put a default value in for the VFC offset that is much closer to a typical offset, like 0xA03800.

    Bill J