When we use BQ8050 to sample current, we found that the current error will be larger with the temperature decreases.
According to datasheet, the least significant bit (LSB) for a simple conversion is 9.35μV or 0.65 nVh. And the sense resistor of our battery is 1mΩ, so the current fluctuation should be about +/-10mA.
In our test, when battery is not charging and not charging, the current value in 25℃ is -18mA~-28mA. But with temparature decreases, the current will be -56mA~-64mA. Please refer to the attached file.
Although the current fluctuation isstill within +/-10mA, but the current value is get larger. Please help explain the temperature drift effect on battery current, thanks.
current change with temperature rise.xlsx
