I recently purchased a Boron and want to use it in an application where the mains DC power input is at 12-15V.
I studied the schematic and see that
- the VUSB pin 3 on the header CONN2 is connected to the VBUS pins of the BQ24195
- BQ24195 states up to 17V permissible bus voltage
- the VBUS_NRF pin of the microUSB connector is protected from reverse polarity by a diode
- all three capacitors (C57, C60, C64) on the VIN net are rated at 25V
That said, is it safe to connect the 15V directly to the VUSB pin though the docs of the Boron specifiy a recommended/max/absolute max of 3.3V/3.6V/6.2V?