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

I am working on a 3.3Volt SX48 design at the moment. What I did was connect the VIn directly to the Vcc pin of the SX-Key header, then also run it into a 3.3V regulator for the SX48 and supporting chips.
So when using the module you can supply anything from 3.6V to 9V, but if you want to program the SX you must supply 5V.
It seems to work fine.
Bean.

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