a wiring question

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Bushman
Posts: 27
Joined: 11 Apr 2006 16:55
Location: Canada

a wiring question

#1 Post by Bushman » 05 Nov 2008 10:29

I was wondering if there is a chance that MAX will harm PIC and vice versa on the diagram bellow.
condition: PIC and MAX do not communicate to a TTL logic device at the same time.

Code: Select all

            --------------  
           |               |
           |  PIC  USART TX|------------>-       ---------------------
           |               |              |     | a TTL logic device  |
            ---------------               |     |                     |    
                                          |---->| RX                  |
 ------         ----------------------    |     |                     |
|      |------>|                      |   |     |                     |
|  PC  |       | MAX Transceiver   TX |->-       ---------------------
|      |<----- |                      |   
 ------         ----------------------
Thank you.
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Colin
Posts: 738
Joined: 15 Oct 2007 08:53
Location: Australia

#2 Post by Colin » 05 Nov 2008 10:39

Bit hard to tell with that drawing.
Just remenber that with any electronic circuit, things can and do go wrong.
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janni
Posts: 5373
Joined: 18 Feb 2006 13:17
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#3 Post by janni » 05 Nov 2008 11:31

This is certainly not a valid connection. Bare PIC USART output (Tx) has also different voltage levels than MAXIM transceiver. One of them will burn sooner or later.
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