Hi,
I'm currently working with BQ76942EVM (I'm new on all these stuff about BMS), I'm doing some tests to understand its behavior and measuring some voltages. I have to determine the value of the capacitor CP1 (charge pump) for 16 FET, I already got the formula from the application note: Multiple FETs with the BQ769x2 Battery Monitors, which is:
V2 = V1 * Ccp1/(Ccp1+(N*Ciss))
where
•V1 is the charge pump voltage before switching on the FETs
•V2 is the charge pump and FET gate voltage after switching on the FETs
•CCP1 is the charge pump capacitor
•N is the number of FETs switching
•Ciss is the gate capacitance of the FET used
My issue is that I don't know where to measure V1 and V2 (yeah it might sound stupid but I really don't know), are these the nodes CP1 or CHG shown in the schematic? or is it V1 the CP1 node and V2 the CHG node?
