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bq34z100-g1 Cricuit verirfication

C
Expert 2065 points
Other Parts Discussed in Thread: BQ34Z100-G1, BQ27320

Hello, 

We are currently using bq34z100-g1 for making a very simple battery gauge indicator. Typically what we want to achieve is to have the possibility to verify battry capacity/charge based on a treshold to turn on a red led or turn of a green led every X seconds..

The battery we use is a CR 2 battery type which we don't recharge and which has only two connector

The device we use is powered by this battery (via J1 and J2), hence power consumption of the battery gauge chip should consume very few.

Can you please advise if bq34z100-g1 is the right chip for this kind of application, if nor propose an alternative.

If bq34z100-g1 is the right choice, can you please review the circuit below? 

  • 0
    TI__Expert 5090 points
    This device is not recommended for use with primary cells. We have a new device which will release in the next several months which is aimed at gauging primary cells. In the meantime, we do have an app note regarding using an older device with a primary cell:

    www.ti.com/.../slua367

    Another approach would be to use the RawCoulombCounter function within the bq27320, to provide information on how much charge has been provided by the cell during its usage, and use this to estimate the level of charge remaining.

    Thanks,

    Terry
  • 0 in reply to -Terry
    Expert 2065 points

    We actually need to be able to measure 3 streshold: full charge of the battery at 3V, treshold 2.7V, treshold 2.2V, empty battery.

    I need to light up some leds based on those treshold.

    Please advise if BQ2730 is still adapted in this situation.