3.14 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 PIC32WM-BW1 Curiosity Board is designed to evaluate the PIC32WM-BW1002UC Module and associated peripherals with an on-board 3.3V regulator by default. The following limitations apply to the circuitry if the PIC32WM-BW1002UC Module and associated circuitry is powered from external power supply header at other voltages:
  • Temperature Sensor MPC9700A (U3) – Standard operating voltage for the temperature sensor is 2.3–3.6V.
  • User LED (D5) – Designed for 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.