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

My  is working.
I like the blue LED light on my new SX-Key during programming.

But I find the area near the coil gets warm after about 20 secs plugged into USB port, even when it is not programming anything.

Is this normal?  Now I keep it unplugged from USB when not in use.

I think the SX28 chip on the SX-Key could be continuously generating Vpp voltages when it is supposed to be idle.
How to make it  cool down?

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