How built a 4-20 mA IDAC

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DeMA_2593386
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Hi

How to built a 4-20 mA IDAC output (PSOC5)

Thanks for help

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

denis,

found it: Planet Analog, Kendall Kastor-Perry,

Just Add a Transistor: The 4-20 mA Current Loop

Kendal-Perry_4-20ma current loop.jpg

/odissey1

View solution in original post

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

denis,

Please check this thread for possible solution using current mirror

Re: Increasing Voltage Compliance with iDAC and Current Mirror

Another method can be using PSoC opamp in Howland pump configuration +IDAC. Not sure it will hold 20mA. See Figure 13 in

http://www.cypress.com/documentation/application-notes/an60305-using-psoc-3-and-psoc-5lp-idacs-build...

/odissey1

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

denis,

found it: Planet Analog, Kendall Kastor-Perry,

Just Add a Transistor: The 4-20 mA Current Loop

Kendal-Perry_4-20ma current loop.jpg

/odissey1

Hi,i want to create 4-20mA output on psoc5.how can i do that?

another one can i change output voltage control with fixed current that created on idac ?

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And, for completeness, this is current mirror design approach. Saved from PSoC Insider blog, which is no longer available...

/odissey1

PSoC Insider Blog_Pressure sensing P5_fig31Schem.jpg

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Hi,

Thanks, I will try it later,

just I know now that is a solution in my request.

Thank you very much for help.

Denis Maccorin

Le 23 janv. 2019 à 22:49, user_342122993 <community-manager@cypress.com> a écrit :

<http://www.cypress.com/>

CYPRESS DEVELOPER COMMUNITY <https://community.cypress.com/?et=watches.email.thread>

How built a 4-20 mA IDAC

reply from user_342122993 <https://community.cypress.com/people/user_342122993?et=watches.email.thread> in PSoC 5LP MCU Community - View the full discussion <https://community.cypress.com/message/185032?et=watches.email.thread#185032>

And, for completeness, this is current mirror design approach.

/odissey1

https://community.cypress.com/servlet/JiveServlet/downloadImage/2-185032-343214/PSoCInsiderBlog_PressuresensingP5_fig31Schem.jpg  <https://community.cypress.com/servlet/JiveServlet/showImage/2-185032-343214/PSoCInsiderBlog_PressuresensingP5_fig31Schem.jpg>

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thanks a lot for answer but i want to creat a 4-20mA source with IDAC.i want to control an electrical switch with IDAC.(electrical switch has a controller between 4-20mA for speed and some function).

thanks a lot...

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No body can help me?I need 4-20mA source to control some device.how can i do that with psoc5?

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image.png

I am using this circuit to creat 4-20mA on output node.but i cant get more than 5mA.i set Pin_a and Pinb and opamp output on analog mode.i set R1=1k ohm and R2=100 ohm.

please give me a solution to give more than 5mA(i need maximum 20mA)?

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roshandelpoor,

What is the load resistance?

/odissey1

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load is 125 ohm.is it ok?or not?

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