2.6 Power Supply

The WLR089 Xplained Pro Evaluation kit automatically detects the availability of power sources based on the following priority:

  • External power
  • Embedded debugger USB
  • Target USB
The following table lists the details of the available power supply sources.
Table 2-4. Power Sources for WLR089 Xplained Pro Evaluation Board
Power InputVoltage RequirementsCurrent RequirementsPin Name
External power
  • 5V ±2% (±100 mV) for the USB host operation
  • 4.3V to 5.5V, if the USB host operation is not required
Recommendation:
  • Requires a minimum current of 1A, which provides enough current for the connected USB devices and the board
  • The maximum current can go up to 2A due to the input protection maximum current specification
PWR
Embedded debugger USB4.4V to 5.25V (according to the USB spec.)500 mA (according to the USB 2.0 spec.)EDBG USB
Target USB4.4V to 5.25V (according to the USB spec.)500 mA (according to the USB 2.0 spec.)TARGET USB
Info: Use an external power supply when 500 mA from a USB connector is not enough to power the board with possible extension boards. A connected USB device in a USB host application may easily exceed this limit.