2022-01-20 10:56 PM
2022-01-22 03:26 AM
And what's the actual voltage on VREF+ pin? Don't you have connected 3V to it externally?
You may also want to read https://community.st.com/s/article/how-to-configure-vrefbuf-on-my-stm32
JW
2022-01-22 04:52 PM
Yes, the VREF is connected to 3V externally.
2022-01-22 06:06 PM
We found that if the DAC output is connected with a 100K resistor, it is 3V, while if it is connected to a 27K resistor , the output is lowered to 2V. Does it because of the driver?
2022-01-23 05:35 AM
What do you mean by "driver"?
The DAC's current driving capability is small, see datasheet. You can switch on a buffer, but then the output won't go all the way to the rails.
JW