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Here are our sensors specifications:
The sensors are designed by us by putting a piece of plastic foil between two pieces of metal foils and gluing them together. It’s used as pressure sensors. The peak to peak output voltage with touch is about 400 mV. The peak to peak output voltage without touch is about 30 mV. The average output voltage with touch is 16mV. The average output voltage without touch is 9mV. The output impedance is 30 meg ohm.
Could you please give some ideas of how to verify these specifications and see if I could directly connect the sensors to PSoC?
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PSoC 5LP
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Welcome in the fascinating world of PSoCs!
Some considerations beforehand:
What is the needed accuracy and what is the required precision. What is the wanted conversion time and how many of that sensors do you wand to connect.
The analog DC input impedance is in the order of GOhms, so probably not an issue.
The resolution of the ADCs go up to 20bits, subtract some because you might not be able to use the full-scale.
Noise can be an issue, to when speed allows, you may averace measures.
Hope that helps!
Bob
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You might take a look at -
http://www.cypress.com/?rID=49159 AN66444
http://www.cypress.com/?rID=2894 AN2226
Also consider using sensor in one arm of a bridge, to get rid
of CM signlas given you are at such a high Z interface and hence
prone to pickup/stray coupling.
Regards, Dana.
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Thanks a lot! I think I know how to verify it. Let me try it.