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Jon Titus
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Re: Part IV: Fundamentals of Digital Debugging
Jon Titus   1/19/2012 3:50:04 PM
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Q: Most microcontollers seem to have 3.3 level voltages. Can anyone recommend good resources to learn about interfacing to 5 v, 24 volts etc. Inputs and outputs..

 

A:  Texas Instruments makes a 5-to-3.3-volt converter chip that also works as a 3.3-to-5-bolt converter.  It's the SN74LVC4245A in an SMT package.  If you use solderless breadboards or a breadboard with holes on 0.1-inch centers, but adapter boards from SchmartBoard.  I use them.

 

To connect to 24-volt equipment--assuming you don't mean switching high-power loads such as motors or large relays--TI has high-current drivers such as the SN75451B.  It will handle 30 volts at 500 mA.  TI has other drivers in this family of ICs.



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