Question on 3v to 5v SPI

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  1. - 10th October 2005, 18:34 #5
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    Yes the pic will run at 3v but I have a math coprocessor that simply refuses to work at any voltage below 5v. The easiest thing is to keep the 5v logic for the pic and the cocpu and convert to 3v for the 3v device compass. I am going to try voltage dividers for the step down (output, and clock) and a standard NPN transistor with the base connected to the output of the compass(with bias resistor), the emitter connected to the pic, and the collector connected to +5V for the step up input. In case you cant tell, I am new to digital circuits, but do I have some experience with analog designs. Would this setup allow 5v to 3v communications?
    Last edited by BertMan; - 10th October 2005 at 18:38.
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