3.1 Power Supply

The following are the list of sources to power the WBZ351 Curiosity Board:

  1. A host PC can power the WBZ351 Curiosity Board over USB using a Type-A-to-Micro-B USB cable connected to a Micro-B USB connector (J7).
  2. 4.2V Lithium battery (Li-ion/Li-Po) battery kit as follows:
    • Connected to battery header (J3), JST PH, 2-pin, 2 mm pitch and right-angle male battery header
    • Crimp style connector, battery polarity according to +/- marking on the 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 the USB power supply and battery supply.

The following are the two on-board MCP1727 voltage regulators on the WBZ351 Curiosity Board that power the circuitry on-board.
  • Voltage regulator (U10) – Generates 3.3V that powers the WBZ351PE Module along with the associated circuits
  • Voltage regulator (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 3-2. WBZ351 Curiosity Board Power Supply Block Diagram

The WBZ351PE Module and associated peripherals can also be powered from:

  • External power supply header (J5) using an external power supply (1.9-3.6V) for testing at different voltage levels apart from the default supply of 3.3V from the on-board regulator. To use the external power supply header, disconnect the on-board 3.3V supply according to the following table:
Table 3-2. Jumper Option (J5) to Select the WBZ351PE Module Power Supply

On-board 3.3V Regulator

External Power Supply

Short J5 pin 1 and pin 2, with shunt resistor (R36) mounted (default configuration)

Use J5 pin 2 for external power and J5 pin 3 for GND connection. Do not mount R36.

Note: The maximum available current from the PC host USB is limited to 500 mA. The current is shared between charging the external battery (if connected) and the target application section.