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BQ24195 Boost Mode not working

Devyn Byrnes
Prodigy 60 points

Other Parts Discussed in Thread: BQ24195

I'm trying to get my BQ24195 into boost mode, but I never see 5.1V on the PMID pin.

  • I am using the same circuit as depicted in the application notes in the datasheet.
  • I am connected to 3.7V lithium battery pack only.
  • I have turned on Boost Mode by making sure OTG is high and writing REG01 [5:4] = 10 (confirmed from the scope)
  • REG08 = 0x00
  • REG09 = 0x10
  • REG09 = 0x00 (when I read it a 2nd time)
  • Battery pack voltage coming in is 3.9V
  • VBUS = 0V

I'm still only seeing around 3.54V on the PMID output! What am I doing wrong here?

  • 0
    TI__Guru 62371 points
    According to the register values, your device was not in OTG mode because REG08[7:6] should be 11 in OTG mode.
    Please follow "Switch to Boost Mode" on p9 of the 195/L EVM User's Guide to verify OTG mode.

    Thanks!
  • 0 in reply to Ning T
    Prodigy 60 points

    Here are the register read for the 195/EVM hardware:

    As you can see, the TI EVM board works and Status changes accordingly. I verified 5.13V on the PMID output.

    Here are the register read for the My custom hardware using the bq24915:

    When I change it to OTG mode in the PWR-ON CFG for my hardware, the VBUS status does not change. What could cause this to happen?

    Is there a secure place I can send my schematics for review?

    Thanks,

    Devyn