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BQ25895: Battery Over-Discharg Protection

Armando Genovese
Prodigy 20 points
Part Number: BQ25895

Hi community,

I am testing the "battery over discharge protection" feature using a BQ25895EVM.

I found a threshold of 2.85V (measured on the test points) instead of the max 2.5V reported on data-sheet for Vbat_dpl. 

Is Vbat_dpl a tested or design parameter?

What is the meaning of the Vbat_dplz if to recovery from over-discharge an input source is required at Vbus?

Regards

  • 0
    TI__Guru**** 166466 points
    Hi Armando,

    Are you using an actual battery or simulator for testing? How are you depleting the battery/simulator, a load on SYS or in boost mode? If a battery, does it have a protector that is opening? The VBAT_DPL is a tested parameter and is assuming the battery is powering the IC in charge mode. In boost mode, the VOTG_BAT spec determines when the IC stops boosting.
  • 0 in reply to Jeff F
    Prodigy 20 points
    Hi Jeff,
    I am using a simulator and a load on SYS.
    Yes, if OTG_CONFIG=0 the parameter Vbat_dpl is respected and if the device power up from battery and the pin OTG is low Vbat_dplz is respected; otherways Votg_bat overide both.

    Thanks

    Armando
  • 0 in reply to Armando Genovese
    TI__Guru**** 166466 points

    Armando,

    We tested a bq25895EVM with ISYS=0.5A on the bench and found the Vbat_dpl falling threshold is 2.34V and rising threshold is 2.540V/