Part Number: BQ40Z80
Hi,
My customer would like to know if they can disable FET_EN in the field in order to control the FETs manually. My concern was that it disables charge and discharge per the TRM, but they have tested this with no issues per the use-case detailed below. Would there be any issues with FET_EN being disabled during normal operation in the field and using FET Toggle to turn them on/off?:
Our scenario is that we would set FET_EN = 0, and then toggle the CHG and DSG FETs ON for normal operation. This way, when we receive the command to turn OFF one or the other, we can.
The testing we have done so far (over current in charge and discharge) shows the FETs turn OFF and then recover in the normal fashion. The FET function from a safety standpoint appears to be the same whether FET_EN =1 or FET_EN = 0.
What does disabling FW control mean if the function is the same either way we set FET_EN?
We have our own system microprocessor that accepts commands from the outside world and transfers them to the 40z80. We can handle ChargingVoltage() and ChargingCurrent() on our own though this processor. Is there something else we are missing?
Thanks,
Antonio