AMuxHW component

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AlVa_264671
Level 5
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Hi guys how are you doing !

   

 

   

I beg your help with an issue that arise because I am using many AMuxHW comoponents simultaneously.

   

Wtha I need is 8 Demux  with VDDA and VSSA as input.

   

If you woulkd like to take a look at the schematic I am posting trough a PDF file, I am sure you will undestand more clearly.

   

Psoc creator give me  a build error when I try to use one analaog input to connect externaly VDDA to one DEMUX input and VSSA to the other. This is happening wit pin_1 (VDD) and PPin_2 (VSS). ( take a look to nschematic)

   

Both pin are located at P3(0) and P3(1).

   

If there are other way to do that plese let me know.

   

I am using the CY8CKIT-030 PSoC® 3 Development Kit

   

 

   

I will as always appreciate very much any help.

   

Thank you

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Bob_Marlowe
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Attachment is missing.

   

Can you post your complete project, so that we all can have a look at all of your settings? To do so, use Creator->File->Create Workspace Bundle (minimal) and attach the resulting file (do NOT use chrome, that still may not work).

   

 

   

Bob

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ETRO_SSN583
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I found this to route error free -

   

 

   

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Anonymous
Not applicable

HI again all of you.!!! Thank you very much.

   

dannaknight ; thank so much  for your answer  and sugestion, I have tried that before and Psoc C. give me build error for that.

   

Just wait  my explanation about what I have tried before.

   

Bob :  I have created a minimal bundle as you have suggested me.

   

First of all what I am intend to do :

   

I have  64 FSR( force sensitive sensor) arranged in an array of 8x 8.

   

Because the scannig method I would need to sequentialy connect to Gnd least columns in a given instant of time. That is the reason of the row of Demultiplexers.

   

But the issue here is that Psoc Creator  give me an error with pin components where I am connecting Vdda and Vssa.

   

I have tried the solution proposed by dannaknight befor the actual one  but with other component , the analog multiplexer.

   

In that case Psoc creator ask me for put  pin component and does not  place of Vref component. Is like que

   

On the other hand I haven't write code yet.!!!

   

I stoped the intention to do to solve the issue with hardware.

   

So thank you all of you for some help

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Bob_Marlowe
Level 10
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Wouldn't switching be easier with a digital port? Since you are interested only in switching between Vcc and Gnd that could make your design much more simpler.

   

 

   

Bob

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ETRO_SSN583
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Using digital port would increase FR measuerment inaccuracy and add additional undesired noise

   

into meaurement.

   

 

   

Regards, Dana.

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AlVa_264671
Level 5
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Hi Thank you very much for the suggestion!

   

I am wondering how can I use a digital port  to conmute between VCC and Gnd  would you Bob explain me with a simple diagram ?

   

I suppose you are talking about a digital input port.

   

In that case who will change the digital value from vcc to gnd ?

   

Any way this issue in my project may be worked out with a couple of MAX4674, 2:1 multiplexer. but it was no my intetion .

   

But I am wondering  why Psoc 3 cannot do that. I would learn about that.

   

It is about routing optimization ?

   

Thank you guys

   

Best regards,

   

Alex101

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Bob_Marlowe
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See attached example.

   

 

   

Bob

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AlVa_264671
Level 5
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Thank you very much Bob !

   

I wil try that !!!!

   

 

   

Best regards,

   

Alex101

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