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BQ27Z561-R1: voltage offset

Ryan Wang
Expert 5470 points
Part Number: BQ27Z561-R1
Other Parts Discussed in Thread: BQ27Z561

Dear expert,

Before calibration, customer measured 3780 mV for 3800mV voltage in their BQ27Z561 board. They measured around 100pcs board and all around similar  -20mV range before calibration. (System is in standby, so current is very low, 10s uA)

Is this -20mV offset due to ADC? 

Does it meet our spec? I don't know how to calculate based on parameter in 6.11 Analog Digital Converter (ADC).

Does the same ADC is used for both voltage and current measurement? Why current measurement is still very accurate in customer board(not like voltage measurement) ?

Great thanks

  • +1
    TI__Guru** 102355 points

    Hello Ryan,

    We always recommend doing calibration on the customers finished PCB, there's no spec for the offset that could be measured without calibration the gauge on the customers PCB. The ADC for Coulomb Counting is not the same as the ADC for voltage and temperature measurement.

    Sincerely,

    Wyatt Keller