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bq25895 can switch to OTG

Miroslav Slvoacek
Prodigy 20 points
Other Parts Discussed in Thread: BQ25895

Hello,

can I ask you for hint how to run OTG mode on bq25895 ?

I´m working with bq25895EVM and I cant to run OTG until USB/VBUS is powered in.

Only when I use OTG pull-down then battery voltage is applied, but no OTG fuction run.

THX for help!

  • 0
    TI__Guru**** 166696 points
    The OTG boost output from PMID is only enabled if all of the conditions below are valid:
    1. BAT above BATLOWV
    2. VBUS less than BAT+VSLEEP (in sleep mode) (i.e., VBUS is removed)
    3. Boost mode operation is enabled (OTG pin HIGH and OTG_CONFIG bit =1)
    4. Voltage at TS (thermistor) pin is within range configured by Boost Mode Temperature Monitor as configured
    by BHOT and BCOLD bits
    5. After 30 ms delay from boost mode enable
  • 0 in reply to Jeff F
    Prodigy 20 points

    Hello Jeff,

    thank you for respond. Problem is that I cannot get BAT above BATLOWV, because if no VBUS is applied, ADC is no working on bq25895 - Am I right? When I set "Start ADC bit" nothing happen and in status register is still 2.304 V. Is there any special ADC handling without VBUS input?


    BR