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PSoC™ 4

hesc_1314511
Level 3
10 replies posted 10 questions asked 5 replies posted
Level 3

hello, I am using an external opamp for a K typethermocouple, I am using thmocouple component in Psoc Creator, the question is, how can I connect a NTC for cold junction compensation? is there a code example?

Thanks

Henry

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1 Solution
odissey1
Level 9
First comment on KBA 1000 replies posted 750 replies posted
Level 9

Henry,

I don't think that PSoC provides cold junction compensation. For cold junction compensation one needs something like MAX31855 module, which has calibrated voltage generator inside, which "fakes" cold junction voltage:

https://www.adafruit.com/product/269 

https://datasheets.maximintegrated.com/en/ds/MAX31855.pdf

MAX31855.jpg

(Notice 5V->3.3V LDO at the top.)

I would like to warn you that there are cheap clones of that module on the Internet, which are counterfeit. They are typically 3.3V only, have wrong PCB layout and some even come with a fake chip (that is what I got, you can google fake chip series).

/odissey1

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1 Reply
odissey1
Level 9
First comment on KBA 1000 replies posted 750 replies posted
Level 9

Henry,

I don't think that PSoC provides cold junction compensation. For cold junction compensation one needs something like MAX31855 module, which has calibrated voltage generator inside, which "fakes" cold junction voltage:

https://www.adafruit.com/product/269 

https://datasheets.maximintegrated.com/en/ds/MAX31855.pdf

MAX31855.jpg

(Notice 5V->3.3V LDO at the top.)

I would like to warn you that there are cheap clones of that module on the Internet, which are counterfeit. They are typically 3.3V only, have wrong PCB layout and some even come with a fake chip (that is what I got, you can google fake chip series).

/odissey1

0 Likes