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BQ34Z100: BQ2004 and BQ34Z100-G1 current sensing compatibility

Kevin Cerutti
Prodigy 100 points
Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQ2004, , BQ34Z100

Hello,

We have a design using a BQ2004 as battery charger. We use a sensing resistor to control the current in our battery pack.

Can we use a BQ34Z100-G1 as Battery Gas Gauge in combination with it ?

Here are the schematics of the two from the datasheets :

If it is possible, how do i cable the two together ?

Can i use the same Sense Resitor for the two ?

PS : The IREG we want for the battery is 900mA.

Thanks in advance for your help,

Kevin

  • 0
    TI__Mastermind 42535 points

    Hi Kevin,

    I can't advise you if you can use the same sense resistor for both. The suggested R sense for the bq34z100 is 10mOhm. It will measure current across the gauge in both chg and dsg direction and can handle 900mA current load.

  • 0 in reply to Batt
    Prodigy 100 points

    Hi Batt,

    Ok, so is there any other solution to make the two BQ work together ?

    Or is there an alternative, like an other Gas Gauge from TI that is compatible with the BQ2004 ?

    Thanks,

    Kevin

  • 0 in reply to Kevin Cerutti
    TI__Mastermind 42535 points

    Hi Kevin,

    The gauge will work with a 10mOhm sense resistor. You have to post your charger question to chargers.