4.1 Power Supply

The WBZ451 Curiosity Board can be powered using any of the following sources:

  1. The USB supplies power to the WBZ451 Curiosity Board using a Type-A male to Micro-B USB cable connected to the (J7) Micro B USB connector.
  2. 4.2V Li-ion/Li-Po battery kit as follows:
    • Connected to J3, JST PH, 2-pin, 2 mm pitch and right-angle male battery header
    • Crimp style connector, battery polarity according to ± marking on the Curiosity Board
    • Battery is not part of the kit
    • Minimum recommended battery capacity is 400 mAh with a battery charge voltage of 4.2V

Battery management circuit automatically handles selection between USB power supply and battery supply.

The following are the two on-board MCP1727 voltage regulators on the WBZ451 Curiosity Board that power the circuitry on-board.
  • U10 – Generates 3V that powers the WBZ451PE-I module along with the associated circuits
  • U13 – Generates 3.3V that powers the USB hub IC (U201), PKOB4 main controller (U300), along with the associated circuits that connect the PKOB4 debugger to a host PC and MCP2200 USB to UART converter

For more details on the U10 and U13 voltage regulators, refer to the MCP1727 1.5A, Low Voltage, Low Quiescent Current LDO Regulator Data Sheet (DS21999).

Figure 4-2. WBZ451 Curiosity Board Power Supply Block Diagram

The WBZ451PE module and associated peripherals can also be powered from:

  • External power supply header (J5) using external power supply (1.9V – 3.6V) for testing at different voltage levels apart from the default supply of 3V from on-board regulator. To use the external power supply header, disconnect the on-board 3V supply according to the following table:
Table 4-1. Resistor Option to Select the WBZ451PE Module Power Supply

On-board 3V Regulator

External Power Supply

Mount R26

Do not mount R26

Do not mount R32

Mount R32

Figure 4-3. Resistor Position to Select the WBZ451PE Module Power Supply
Note: The maximum available current from the PS USB (J7) is limited to 500 mA. The current is shared between charging the external battery (if connected) and the target application section.