OPAMP on STM32G431KB

[30108eric]

Hi, Master:

Hello, I want to use the opamp amplifier function of the g431kb board to connect an external gain circuit and use standlone mode. Can I use it after downloading my MXsoftware generate code?

I set the OPAMP1_P (PA7) input to 2.5V (DC power supply),

OPAMP1_M (PA3) input to 1Vpp sine wave,

plus 15K ohm R1, 33K ohm R2,

OPAMP1_P (PA7) output should be 5.8V~10.2V , is this correct?

 

Because the output waveform cannot be changed according to the DC power supply, the gain is always 5.
Have I not enabled the OPA function?

 

Thank you very much!​

[Uwe Bonnes]

The Opamp can only work inside the limits of its supply voltage and also needs some head and footroom. So scale down your input to not overdrive the input.

[30108eric]

Hi,

Turn down the input signal and the gain is still 5,and still will not change according to DCpower supply

Whether it is increasing or decreasing the voltage