Dear all,
As a part of the Production flow after calibration but before our BMS-module is attached to the cells we perform function testing (charge - discharge etc) to verify that the bq20x75 and the BMS module is working OK.
Previously - to be able to do the function tests we have pressed the Initialize button - step 5 bqEasy - which we regard the same as sending the MAC 0x0021 command. This will switch both the DSG and the CHG FET's ON.
According to SLUA391 it is not recommended to send the 0021 command to turn ON the FET's at this point of Production flow (before attaching to the cells) because it also starts many gas-gauging functions that can read wrong values.
We have tried to manually switch ON the FET's (0x46 register) but since thy will switch OFF without intervention this seems rather cumbersome.
My questions are:
- The errors introduced when connecting the bz20z75 to the cells with update status = 06 (IT enabled) will this errors be corrected after one or two charge/discharge cycles ?
- If we - after function tests but before connecting the bq to the cells change update status from 06 to 02 would that be an idea to avoid errors introduced ?
Any comments will be very much appreciated
Best regards
Kjell Ramberg
