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BQ27220: Reading is not constant

Gabriel Arnautu
Intellectual 345 points

Part Number: BQ27220
Other Parts Discussed in Thread: BQSTUDIO, EV2400,

Hi,

I am reading the voltage of a battery once per second. The problem is that the few first reading returns 3700mV. After few seconds it returns the good value, but is not very constant, it gets bigger or lower. I am using bqstudio as well and I can see that the voltage reading is quite constant and its discharge is good, even if my program returns strange values some times.

  • 0
    TI__Guru* 76230 points

    Hi Gabriel,

    Are you using your board or the  EVM? What firmware version of bqstudio are you using? which device are you using? ev2300 or ev2400?  What firmware version is on the the device? You can find firmware version on the left hand portion of bqstudio.

    Can you provide a log file of the readings extracted from bqstudio?

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    Intellectual 345 points

    Hi Onyx,

    Let me explain my setup again. I have a custom board which has a BQ27220. On this board I have the problem of reading each second and the result is not very constant.

    I have a development setup with an ev2400 and a BQ27220EVM. This setup works very good. If I am not wrong, the ev2400 has the firmware 0.18.

    Regards,

    Gabriel

  • 0 in reply to Gabriel Arnautu
    TI__Guru* 76230 points

    Hi Gabriel,

    The issue is with your board setup. You can compare that with the EVM set up to see what you have wrong. Hook up an i2c sniffer to see what commands it is that you are sending to the gauge and compare that to what bqstudio sends to the evm.That will allow you see where you are going wrong in the command sequence. It might be the delay between commands that could be the issue

    thanks

    Onyx