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It is possible to build a multiplexing circuitry for the PIC ADC? so we can
have more channels than what a PIC have ( ex : 5 for 16F876 and 10 for 16F877
).
Speed is not a important point in this.
(no external interfaced ADCs
please) __________________________________________________ |
Multiplexing PIC ADC
Started by ●February 25, 2005
Reply by ●February 25, 20052005-02-25
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Message
>
It is possible to build a multiplexing
circuitry for the PIC ADC?
Of course, check for instance the analog multiplexers in the
CD40xx range.
Wouter van Ooijen |
Reply by ●February 25, 20052005-02-25
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--- In , Bakkal Adil <dso310@y...> wrote: > It is possible to build a multiplexing circuitry for the PIC ADC? so we can have more channels than what a PIC have ( ex : 5 for 16F876 and 10 for 16F877 ). > Speed is not a important point in this. > > (no external interfaced ADCs please) As Wouter indicated, you can use analog multiplexers for this. Eg, 74HC4051 gives an 8:1 expansion. Also, depending upon how many channels you need, some of the newer PICs have more A/D channels. Eg, 16F767 has 11, and 16F777 has 14. Rather than add several multiplexers, I'd be tempted to just use several PICs, depending upon how many channels total are needed. I've used the '767, and had troubles with the compare module not working properly, but the A/D's seemed to work ok. - dan michaels www.oricomtech.com ========================= |
Reply by ●February 25, 20052005-02-25
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Yes you can use a CD4051 which is an analog
switch 8 to 1 demultiplexer.
Jim
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