On Thu, 26 Feb 2004 01:43:47 +0000, Edward Cooper wrote:

>Hi
>
>I'm trying to connect a 3.3v GPS device to a 5v PIC, now I need to
>adapt the signals.  I've looked back in the archives, and Brent Brown
>suggested the bellow, but I have a few questions.
>
>Should I add a 3.3v Zener too the RxD line to make sure it can't go
>above 3.3v ever?
>
>Also is there not a simpler way of configuring the TxD line?  Are there
>chips for handling this sort of conversion?
>

You may want to check the documentation on your GPS module. Many of
them can be interfaced directly to CMOS logic levels even though they
run on 3.3V power.


Regards, Bob

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