Unable to feed external voltage reference to DAC

akash07 · ‎2024-09-30

I am using pot meter to feed the external voltage reference to DAC present in NUCLEO-L496ZG, but DAC output pin shows no response (PA4).I can get output to internal reference. I tried changing vrefbuf mode to external voltage reference & vrefbuf off condition too. but dac doesnt produce output
Note: i am feeding pot meter's output to the vref+ pin to provide external voltage reference value

SofLit · ‎2024-09-30

Hello @akash07 and welcome to the community,

First you need to tell more about that "pot meter"? do you mean potentiometer? in that case why are you using a such kind of source? try another source like a regulated power supply.

Second, did you remove SB149 to disconnect it from AVDD?:

Did you solder SB119 (opened by default) that connects VREF from the zio connector?:

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.

View solution in original post

Andrew Neil · ‎2024-09-30

Show your code & your schematic:

https://community.st.com/t5/community-guidelines/how-to-write-your-question-to-maximize-your-chances-to-find-a/ta-p/575228

SofLit · ‎2024-09-30

Hello @akash07 and welcome to the community,

First you need to tell more about that "pot meter"? do you mean potentiometer? in that case why are you using a such kind of source? try another source like a regulated power supply.

Second, did you remove SB149 to disconnect it from AVDD?:

Did you solder SB119 (opened by default) that connects VREF from the zio connector?:

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.