Other Parts Discussed in Thread: BQ76940
I tried to power up the board without installing the batteries. With pack+ 38V, I saw voltage on right side of C18 is 38-18=20V, but left side is 0v, meaning Cell13=0V. C1 is also 0v. After pressing S1, I didn't see TS1 rising edge trigger and thus no REGOUT. That I believe is due to C1=0V.
Since I can't get REGOUT, I don't have 5V and no 3.3V that can power up MCU.
Question are
(1)why Cell13 is 0V? When batteries are not installed, should we see some voltage distributed among C13 to C1? Not all 0V? Is there any short circuit path from left side of C18 to GND?
(2)Do we always need to install batteries or some resistors in order to power up the system?
(3)What is the initial PACK+ voltage you recommend to power up the board? 38V?