Other Parts Discussed in Thread: BQ78350, EV2400
We encounter problems in production regarding temperature and Ext Avg Cell Voltage.
First, we noticed the Gauge's internel temperature could not be calibrated. The temperature needed a too big offset for calibration. We kind of ignored the problem.
But then, we got reports of batteries jumping back to 5% (EDV2) way too early. When we received them, the Ext Avg Cell Voltage reads close to 0. And after removing the BMS from the battery and then reconnecting it, the problem is gone.
Then we also noticed, those exact boards have the temperature problem. After flashing the .srec, it may or may not heat up to 10 degrees above ambient, causing the unexpected temperature calibration, but at the same time the Ext Avg Cell Voltage is wrong. We checked the hardware multiple times, but no faults have been found.
We still don't know what's going on, but these problems only appear on gauges flashed with device firmware R3.0
Can you please help us debugging this problem?
We plan to measure the BAT pin input voltage and also the current consumption when in the faulty state.