3.15 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 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 WBZ451HPE Curiosity Board is designed to evaluate the WBZ451HPE module and associated peripherals with an
on-board 3V regulator by default. The following limitations apply to the circuitry if
the WBZ451HPE module and associated circuitry is
powered from external power supply header at other voltages:
- QSPI Serial Flash SST26VF064B (U6) – Standard operating voltage for the QSPI serial Flash is 2.3-3.6V.
- 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.
- RGB Lighting LED (D6) – RGB lightning LED is powered from VBAT net. It requires either a USB or battery power supply to be functional.