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BQ25700A: CHRG_OK

Jelly li
Intellectual 290 points
Part Number: BQ25700A

CHRG_OK is an active high open drain indicator. It indicates the charger is in normal operation when the following conditions are valid:

1 VBUS is above VBUS_CONVEN 3.2V;

2. VBUS is below VACOV 26V;

3. NO MOSFET/Inductor fault

the questions are:

in OTG mode, OTG output voltage is in the range 3.2V~26V， also meet with above 3 conditions, CHRG_OK is high or low?

  • 0
    TI__Guru**** 166176 points
    Jelly,

    The BQ25700A support team is out until Monday for the US Holiday. I apologize for the inconvenience.
  • 0 in reply to Jeff F
    TI__Expert 5330 points
    Hi Jelly,

    Whether or not CHRG_OK will be driven high in OTG mode is determined by Register 0x12, bit 11 -- "Charge Option 0" register, "OTG_ON_CHRGOK" bit. By default this bit is 0 and CHRGOK will not be driven high in OTG mode, but this behavior can be changed by setting the bit.

    More detail available in datasheet section 8.3.3. Excerpt below:

    8.3.3 USB On-The-Go (OTG)
    The device supports USB OTG operation to deliver power from the battery to other portable devices through
    USB port. The OTG mode output voltage is set in REG0x3B(). The OTG mode output current is set in
    REG0x3C(). The OTG operation can be enabled if the conditions are valid:
    • Valid battery voltage is set REG0x15()
    • OTG output voltage is set in REG0x3B() and output current is set in REG0x3C()
    • EN_OTG pin is HIGH and REG0x32[12] = 1
    • VBUS is below VVBUS_UVLO
    • 10 ms after the above conditions are valid, converter starts and VBUS ramps up to target voltage. CHRG_OK
    pin goes HIGH if REG0x12[11] = 1.


    Regards,
    Steve