STM32L476: how to select ADC & ADC channel the DAC is internally routed to ?

[VDaanen]

Hello,

I'm planning to use a STM32L476 to acquire approx 150 analog signals. 

For some reasons, I have to periodically check the justness of the ADCs.

I read in the RM that it is possible to connect internally DAC to ADC but I can not figure out how to select on which ADC & ADC channel the DAC output is "routed" to.

Can someone point me to info related to this ?

thanks

[RomainR.]

Hello VDaanen 

According STM32L47xx RM0351 Rev 9, chapter 18 ADC, page 509 and 510.

Non Bufferized DAC1 and DAC2 channels are internally connected in single-ended to

• ADC2 IN17 and IN18.
• ADC3 IN14 and IN15.

Here the link:

https://www.st.com/content/ccc/resource/technical/document/reference_manual/02/35/09/0c/4f/f7/40/03/DM00083560.pdf/files/DM00083560.pdf/jcr:content/translations/en.DM00083560.pdf

Regards.

Romain

[Aime · Accepted solution]

Hi @VDaanen​ ,

Thank you for sharing your request :) .

In fact the answer is in the RM (0351), section 18.4.11 "Channel selection (SQRx, JSQRx")

It is mentioned that :

• The DAC1 internal channel 1 is connected to ADC2_INP/INN17 and ADC3_INP/INN14
• The DAC1 internal channel 2 is connected to ADC2_INP/INN18 and ADC3_INP/INN15

As indicated on the schemas that you can also find in the RM

Please find in attached the document ;) .

Best regards,

A.MVE

[Aime]

Hi @VDaanen​ ,

Please let me know if you need more support for my side ;) .

Otherwise if I gave you the right answer, select my answer as the best so that will help the others members to find the thread.

Best regards,

A.MVE