RP2040 external Analog Reference

Products & Technology RP2040
#1

I would like to use an External analog reference for Xiao RP2040, but I’m not sure how to make it work since I dont see any ARef pin. Any help to add a LM4040 board to RP2040 Xiao will be great :slight_smile: :slightly_smiling_face:

#2

I hope this schematic can help you.
XIAO RP2040 v1.22 SCH.pdf.zip (61.1 KB)

#3

Same issue but for the Xiao SAMD21.
Any help figuring out how to use the LM4040 board to read precise Voltages above 3.3v would be appreciated.
Not very schematic savvy, would love some help figuring out how to call the external reference like for example the Arduino:
" analogReference(EXTERNAL); "

#4

I think it will be helpful if seedstudio kindly make a short hookup guide covering this issue.

#5

Can refer to this reply: