3.3 Power Sources
The SAM4S Xplained Pro kit can be powered by several power sources listed in Table 3-3.
Power input | Voltage requirements | Current requirements | Connector marking |
---|---|---|---|
External power | 5V ± 2% (± 100mV) for USB host operation. 4.3V to 5.5V if USB host operation is not required. | Recommended minimum is 1A to be able to provide enough current for connected USB devices and the board itself. Recommended maximum is 2A due to the input protection maximum current specification. | PWR |
Embedded debugger USB | 4.4V to 5.25V (according to USB spec) | 500mA (according to USB spec) | DEBUG USB |
Target USB | 4.4V to 5.25V (according to USB spec) | 500mA (according to USB spec) | TARGET USB |
The kit will automatically detect which power sources are available and choose which one to use according to the following priority:
- External power.
- Embedded Debugger USB.
- Target USB.
Info: External power is required when 500mA from a
USB connector is not enough to power a connected USB device in a USB host
application.