Dear All,
we are testing a new PCB with BQ40Z50.
we are trying to calibrate the pack, and we are not able to open CHG/DSG.
when can write FET_EN(0x22), and Toggle_CHG/DSG (0x1F,0x20) successfully.
only thing that is not being toggled is FUSE(0x1D)...
the fuse operation is not used in our circuit and nothing is connected to FUSE pin.
as a result, we are not able to perform calibration, CHG FET and DSG FET are closed, even when forced - is that normal?
any idea how to solve it?
Ran