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i want to make loop powered temperature transmitter.i attached my project diagram.
i am using XTR116 (TI IC) for 4-20mA at output side.
XTR116 is also gives +5 Regulated on pin 1.you can see in attached file.
But i have to use it below 3.3V and <3.8mA as per the XTR stability.
Now i want to use cypress for ADC Reading of RTD and Thermocouple.
So can anyone suggest me which cypress IC and PSOC i have to use for this particular application which has very lower power consumption ??
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PSoC 1
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Hello Chirag,
It is possible to implement 4-20mA current loop using PSoC. Either PSoC3/ PSoC5LP device can be used for this application. Please refer the below links for more information:
http://www.planetanalog.com/author.asp?section_id=3066&doc_id=563262
http://www.psocdeveloper.com/forums/viewtopic.php?f=3&t=6215
http://www.cypress.com/forum/psoc-3-device-programming/can-i-measure-current-0-20ma-directly-psoc3
Thanks
Ramesh B
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Hello Chirag,
It is possible to implement 4-20mA current loop using PSoC. Either PSoC3/ PSoC5LP device can be used for this application. Please refer the below links for more information:
http://www.planetanalog.com/author.asp?section_id=3066&doc_id=563262
http://www.psocdeveloper.com/forums/viewtopic.php?f=3&t=6215
http://www.cypress.com/forum/psoc-3-device-programming/can-i-measure-current-0-20ma-directly-psoc3
Thanks
Ramesh B
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Hello Ramesh,
Thank you for your reply, but I think that the question here is not how to make a 4-20 output loop from PSOC,
I would also like to know that if it is possible to run any of the Psoc ( 1,3,4,5) that would use some excitation current to determine resistance in sensor, using 5v and current consumption less than 3mA ?
because above that, it would be violating the current limit and would start interfering with 4-20mA signal in a strict 2 wire transmitter application.
I have tried to make same project using psoc1 and 4 and so far it has not been working because both of the family are drawing more than 20mA current from the loop.