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BQ24092: BQ24092

DVI17
Prodigy 100 points
Part Number: BQ24092

Hi,

I am using BQ24092 in my charger project. I connect the "out" pin directly to a fuel gauge Vdd. I notice the fuel gauge works only when the battery insert. If there is no battery, the fuel gauge doesn't work, even the "out" pin has around 4.2V . I want to know, when there is no battery, no load connecting to the "out" pin of BQ24092, the voltage on the "out" is floating voltage or a real 4.2V?

Thank you.

Bo Zhou  

  • 0
    TI__Guru 65846 points
    Hello Bo Zhou
    When the battery is removed the device may be in a Battery Detect mode and the output voltage will be a square wave. This may be causing problems with the fuel gauge. Check the output voltage with scope to look for waveform. Also see figure 4 and 6 in data sheet.
  • 0 in reply to Bill Johns
    Prodigy 100 points
    Hello Bill,
    Thank you for your response. I noticed the output is small square waveform with no battery. Before I tried to use this waveform to determine the battery insertion or removing, however the reading from the fuel gauge is not satisfied. Maybe like you said, the voltage up and down causes the problem with the fuel gauge. I will use an ADC channel in my microcontroller to detect battery.
    Thank you again.
    Bo Zhou