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BQ25882: OTG cannot be caught

run Ren
Prodigy 220 points
Part Number: BQ25882

Hi:

The product designed by me USES TI's BQ25882, and trial production of 100Pcs has been carried out, among which 4Pcs of OTG cannot be caught. After analysis, it is found that ADC is not enabled. If ADC_Enable is set to 1, OTG can be caught.Please help to answer the following questions:

1.ADC_Enable Effect?

2.100 pieces have been trial produced, and all the software ADC_Enable is set to 0. Logically speaking, OTG cannot be caught, but actually only 4Pcs cannot be caught. Please help to solve the problem?

BR

Rain

  • 0
    TI__Guru**** 166626 points

    Hi Rain,

    Can you explain what you mean by "cannot be caught"?  Is OTG not turning unless ADC_Enable=1?

    Regards,

    Jeff

  • 0 in reply to Jeff F
    TI__Guru**** 166626 points

    Rain,

    From datasheet section 7.3.5 on page 19:

    The maximum output current is up to 2.0 A. The buck operation can be enabled if the following conditions are valid:

    1. BAT above VOTG_BAT

    2. VBUS less than VVBUS_PRESENT

    3. ADC is enabled

    4. Buck mode operation is enabled (EN_OTG = 1)

    5. Voltage at TS (thermistor) pin is within range configured by Buck Mode Temperature Monitor as configured

    by BHOT and BCOLD register bits

    Regards,

    Jeff