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PSoC 5, 3 & 1 MCU

Anonymous
Not applicable

 Out of curiosity one more question.

   

What is the rating of diodes in the Pin structure of PSoC. For sure they are meabt for ESD. Any idea on what are their ratings.

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Esteemed Contributor

The Vil, Vih levels limited to .5V off the rails, and 140 mA limit to

   

invoke latchup. So these specs effectively would be the characterized

   

process values safeguarded by some margin.

   

 

   

Regards, Dana.

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Anonymous
Not applicable

So, if I have voltage of 3.3 + 0.7 (Vddio is of 3.3V) then the signal never enters my pin as the diode shows a very low resistance path for my signal. Am I correct???

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Esteemed Contributor

The pin clamps to Vdd +Vthdiode, until you feed too much current into

   

it to either trigger the parasitic SCR mechanism, blowing out Vdd bond

   

wire internal, or silicon meltdown.

   

 

   

If you do not exceed the current rating then signal looks like a "1" as

   

it would normally. For the digital case.

   

 

   

For the analog case, Cypress does not have any stated specs on

   

phase reversal on OpAmps when their inputs are driven outside

   

their CM range. You would have to test for that.

   

 

   

Regards, Dana.

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