Hi everybody,
I'm working on a protection design for Li-ion Titanate cells using a BQ77910A. I have some difficulties to understand which design to use for the charger detection. I know the "latched2wire" design, the CHGST pin remains high until a fault occurs. So, in this condition, it is not possible to use the Cell-Balance in mode 2 or 3 because the BQ77910A see a charger even if i have removed it, is that right? If the BQ77910A doesn't see the charger removal, there are not much advantages of this method over to tie CHGST high?
Before the revision of the BQ77910, the 2 wires scheme was not latched and a 100ms pulse on CHGST wake up the chip. But it is not possible to use the Cell-Balance in mode 2, and mode 3 has to use the timer expiration because the BQ77910A see the charger already removed. Am i right? The advantage of this methode is to be able to use de shutdown mode.
Btw, is the 2-wire without latch method sure with the new revision of the chip or there is still an issue with the UV fault recovery?
Thank you, best regards.
Pierrick.