3.1 Power Supply

The WBZ451HPE Curiosity Board can be powered using any of the following sources:

1. The USB supplies power to the WBZ451HPE Curiosity Board using a USB Type-A male to USB Type-C cable connected to the Debug USB Type-C connector (J7).
2. 4.2V Li-ion/Li-Po battery kit includes the following components:
   • Connected to J3, JST PH, 2-pin, 2 mm pitch and right-angle male battery header
   • Crimp-style connector ensures battery polarity according to ± marking on the Curiosity Board
   • Battery is not included in 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 WBZ451HPE Curiosity Board that power the circuitry on-board.

   • U10 – Generates 3.3V that powers the WBZ451HPE-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).

   

3. The WBZ451HPE module and associated peripherals can also be powered from:

   • External power supply header (J5) using external power supply (1.9-3.6V) for testing at different voltage levels apart from the default supply of 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. Resistor Option to Select the WBZ451HPE Module Power Supply

   On-board 3.3V Regulator	External Power Supply
   Mount R26	Do not mount R26
   Do not mount R32	Mount R32