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PSoC 5, 3 & 1 MCU

Anonymous
Not applicable

 Hi,

   

I want to use one continuous time analog block to invert an external analog input, in a PSoC 1 chip. 

   

The block PGA_INV exist for PSoC creator but I can't find an alternative in PSoC Designer (for PSoC 1..).

   

What can I do?

   

Thanks,

   

          Peli

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6 Replies
Esteemed Contributor II

When you use a CY8C29466 chip you will find an AMPINV component as you need.

   

 

   

Bob

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Esteemed Contributor

This might help if in yiour device module catalog -

   

 

   

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Anonymous
Not applicable

 Hi Bob,

   

The problem with AMPINV is that it only works for internal signals, therefore I can't use it on an external Analog signal coming from the Analog column BUS.  See attached datasheet description of AMPINV vs. PGA. 

   

What I need is an Inverting PGA block, which can work on external signals. Unfortunately it doesn't seem to exist it PSoC Designer, but only in PSoC Creator (there it is called PGA_Inv). 

   

Is there any way to import or create the necessary CT Block?

   

Thanks,

   

           Peli

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Esteemed Contributor II

You could use an additional PGA (Gain = 1.000) and feed the output into an AMPINV giving you the choice to additionally mux and condition the signal, but with the downgrade of additional noise.

   

 

   

Bob

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Esteemed Contributor

Just curious, what is the reason you are constrained to need

   

the inverting capability ? What is the ouput being used for ?

   

 

   

Regards, Dana.

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Anonymous
Not applicable

  Hi Dana,

   

It's to check a spread specturm application, so I need both the signal and its negative.

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