Power Output
The board can provide:
- 5 V output from USB port (CON3)
- 12 V output from DC jack (J5)
- 54 V PoE output from RJ45 port (CON1)
- 3.3 V output for XBee module
More information about these output power options are given below.
USB Power Output
The USB Type-A receptacle is used for powering third party modules such as Raspberry Pi and BeagleBone Black which require 5VDC power. This USB port:
- "Charging port" only and does not provide USB data connectivity
- Output power efused at 1A
Note! Do not plug-in any USB device that requires a higher power supply; the USB port will shut down via eFuse
Figure 10: USB port
PoE PSE Output
An onboard isolated 54V PSE converter supplies power via a MicroSemi 69104 PSE controller; only one port is connected. The PSE converter has a capacity of full 802.3at power output but limited to power supplied to the HDK. The power is supplied through the RJ45 jack. PSE 802.3af or 802.3at output power classification can be set using the SW2 slide switch or jumper J8.
The maximum PSE power output provided depends on the power supplied to the board minus attached hardware.
In general, the HDK has enough power for PSE only when the host AP is run off of uPoE or external DC jack with appropriately sized power adapters. The approximate values are given below.
| Maximum Power Output | Power Supplied to the Board from |
|---|---|
| 13.4 W | AP through Golden Finger connector giving 12 V input |
If PSE functionality is not required, PSE converter may be disabled to reduce overall HDK power consumption
Power Output for XBee Module
Digi XBee radios are typically low power devices and can consume millwatts up to a couple of watts peak. You can enable/disable power to the XBee using the J13 jumper.
For convenience and least confusion, leave it powered on.