IDAC IN 5LP NOT SOURCING 1MA CURRENT IN RTD EXAMPLE

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prbh_3338016
Level 4
Level 4
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i AM TRYING TO REBUILD THE RTD EXAMPLE OF PSOC3_4 FOR PSOC5LP KIT BUT MY RTD READINGS ARE NOT PROPER DUE TO IDAC NOT SOURCING PROPER 1MA CURRENT.

i TRIED 1MA SOURCING IN DIFFERENT EXAMPLE OF IDAC8 OF 5LP . HERE IT WORKS FINE BUT IN RTD EXAMPLE IDAC JUST SOURCE 0.22microamps and not 1ma.

please help as this is weird situation

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Vasanth
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Hello Pratik,

I have tested the project as per your configuration on CY8CKIT059 kit. I have kept break points during Reference resistor measurement and RTD resistance measurement and I was able to see ~1mA current on both the pins using the multimeter. So the issue at your side might be something else. Could you please tell keep a breakpoint after the IDAC value is set and tell me the voltage at these pins? Your schematic says you are connecting less value resistnaces- so that should not be the issue. Otherwise if you exceed the headroom voltage of the IDAC, you will not be getting the required current. I just wan to confirm that too.

Best Regards,
VRS

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