3.19 Limitations of Using Battery and External Power Supply
Battery Power:
The battery management circuit is designed for a 4.2V battery going to a downstream 3.3V regulator. When the battery voltage is near to the required minimum input voltage of the regulator, it may affect the regulated output. It is recommended to use a fully-charged battery for evaluation and recharge the battery as soon as the low battery output indicator is turned ON at 3.1V.
External Power Supply Header:
The PIC32-BZ6 Curiosity Board is designed to evaluate the PIC32WM-BZ6204UE Module and associated peripherals with
an on-board 3.3V regulator by default. The following limitations apply to the circuitry
if the PIC32WM-BZ6204UE Module and associated circuitry
is powered from external power supply header at other voltages:
- QSPI Serial Flash (SST26VF064B-104I/MF) (U801): Standard operating voltage for the QSPI serial Flash is 2.3–3.6V.
- Temperature Sensor (MPC9700A) (U800): Standard operating voltage for the temperature sensor is 2.3–3.6V.
- User LED (D801): Designed for 3.3V operation, LED brightness at lower voltages will be dull or no glow. To increase the emitted light level, the value of the series resistor (R42) can be lowered.
- RGB Lighting LED (D800): RGB lightning LED is powered from VBAT net. It requires either a USB or battery power supply to be functional.