In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

Yes, the Vdd pin on the SX-Key USB is not connected. This is why this pin is marked as "----" instead of "Vdd" on the SX-Key USB.

I can't really recommend modifying the SX-Key USB to provide 5V to the Vdd pin. Yes, you migh place a wire jumper from the Vdd pin to some pad on the board connected to the filtered 5V coming from the USB port. You would have to remove the shrink tube from the SX-Key to do that, so you would immediately void any Parallax warrantee. In addition, the USB port might get overloaded depending on the current drawn by the target system.

If you plan to build some kind of USB-powered SX programmer, it should be ok to draw the additional supply for the SX to be programmed from the USB port. Nevertheless, you would have to modify an SX-Key USB out of Parallax warranty as mentioned before.

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