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???
07/04/06 18:35
Modified:
  07/04/06 18:35
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 		 #119632 - just a note
Responding to: ???'s previous message
hi,

the schematic you posted, uses eight 573 + one 138. As suggestion, the same may be done with eight selectors like 251 without 138 chip involved. In this case you use each 251 for each realys` group and then trace its output to port pin (one pin for each group). Indeed, this requires some software re-arrange work but at same time safes chips` number and makes easy tracing of PCB. Think: your way requires about 64 (for data buses) + 8 (to enable) wires from MCU to registers while the way we talk about, needs only 8 (data lines) + 24 (for addressing) ones. Be sure, your hardware team says thanks for it.

Regards,
Oleg

List of 34 messages in thread
TopicAuthorDate
Debouncing with an 8051 of 16 I/O pins            01/01/70 00:00      
   You don't need these slave micros            01/01/70 00:00      
      yes, but some more questions            01/01/70 00:00      
         Not scary at all...            01/01/70 00:00      
            In that case.....            01/01/70 00:00      
            here is the schematic            01/01/70 00:00      
               I would try shift registers            01/01/70 00:00      
               just a note            01/01/70 00:00      
                  The joke is:            01/01/70 00:00      
                     the reality is            01/01/70 00:00      
                     Re: The joke is            01/01/70 00:00      
      correct, but            01/01/70 00:00      
         I was assuming...            01/01/70 00:00      
   Bounce time of your relays?            01/01/70 00:00      
      Not very clearly            01/01/70 00:00      
         Bravo!            01/01/70 00:00      
   The original question            01/01/70 00:00      
      What's wrong with the shift register sol            01/01/70 00:00      
      HUH?            01/01/70 00:00      
         I am sorry            01/01/70 00:00      
            that was not the issue            01/01/70 00:00      
   why oh why oh why oh why            01/01/70 00:00      
      because it cost nothing            01/01/70 00:00      
         yeah right            01/01/70 00:00      
            yes, they do            01/01/70 00:00      
            Design is a state function            01/01/70 00:00      
               All the more using shift registers!            01/01/70 00:00      
                  I think your solution is better            01/01/70 00:00      
                     I guessed so...            01/01/70 00:00      
                  hidden part            01/01/70 00:00      
                     I can see a 'lucky sample' of a shift re            01/01/70 00:00      
                     True, but...            01/01/70 00:00      
   jezwolds hardware switch debouncer            01/01/70 00:00      
   The facts about costs of Debouner chips            01/01/70 00:00      

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