Hi,
thanks for your answer. I need to power the board only with the lipo battery ("battery mode" instead of using a USB cable) and I want to supply external circuitry from the 5V pin. With the battery connected, enabling the boost converter to supply 5 volts at the "5V" pin should be possible, right? I used "PMIC.enableBoostMode();" to enable the boost mode via I2C. However, an unexpected non-zero voltage at the VIN pin hinders the boost converter from enabling the boost mode. There is a 1Mohm pull-down at this pin but it is insufficient. An additional 220kOhm pull-down works to pull VIN down and enables a properly boosted 5V output.
This workaround is okay for me, but from what I read so far it should be working without it. So what did I miss?
Thanks again.