Other Parts Discussed in Thread: BQSTUDIO
We using BQ40Z50-R1, after the PCBA mass production test has passed, we connect PCBA to the battery. Golding cycle is OK, and then we put it away.
Several days later, when we test again, we found some problem. A few BMS with no output voltage. Then we connect this BMS to EV2300 and found that opeartion status FUSE bit has set 1 for no reason in SBS, resulting in CHG and DSG MOS turn off. CHG and DSG bit is set to 0.
In our design, BQ40Z50-R1 FUSE pin is directly connected 0R resister to the ground, no three-terminal fuse used, and no secondary protection chip used. FUSE is also disable in GG settings. There are no other error in BQSTUDIO, only is FUSE bit set to 1.
The schematic, SBS picture is as follows.
Please check it and help me to solve this problem.
