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

BPM,

I just took an SX-Tech board without an SX, or the SX-Key installed. Powered from a 12V switched 1A wall-wart supply, I measured a supply current of 21.5 mA. I assume, most of it flows through the green LED, and a minor part may be "eaten" by the voltage regulator.

Next, I plugged in the SX-Key (simply in idle mode), and the supply current went up to 85 mA, so an additional current of 63.5 mA. Most of it should be "consumed" by the SX-Key, and another smaller part by the regulator. This should give you a rough value. To measure the true current into the SX-Key, I would have to cut the trace at the Vdd pin. For now, I refrained from diong it :-) .

So the values I have measured are pretty close to yours, although my SX-Key does not get hot - just a little warm.

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