I'm bringing up a new design using the BQ78350 + BQ76930 chips and having issues with the PRECHGb pin on the BQ78350. The datasheet (SLUSB48) states that the pin has an internal pull-up to 2.5V when it is set as active high output, and is an open-drain when set as active low. I'm using the BQStudio software to play with configurations during these tests.
From what I can tell, there is no internal pull-up. If I externally pull the pin up to the 2.5V source from the BQ76930 everything behaves as expected; including correct polarity of the PRECHGb pin based on settings in the FETOptions() register when I test it using the MAC PCHG-FET command.
Adding a pull-up on the next rev of the board is not a big deal, but I wanted to check if there is another setting I am missing besides the enable and polarity bits in FETOptions() which is required to use the internal pull-up.
Thanks,
-Barrett