Option for ADC3 Differential input is missing in CubeMX

[Ankurgupta4u]

I am setting up my STM32F303RET6 for four differential inputs to be sampled simultaneously. As seen in the screenshot attached. there is no option for differential inputs on CubeMX. Am I missing something here? I have reset whole project to ensure no pins are assigned elsewhere.

[Peter BENSCH]

Welcome @Ankurgupta4u, to the community!

The STM32F303RET6 has a 100-pin package, so the differential mode cannot be implemented for all ADC channels. With the STM32F303VET6 in the 144-pin package, you can indeed select the differential mode for ADC3 IN1.

Does it answer your question?

Regards
/Peter

[TDK · Accepted solution]

ADC3 Channel 1 differential mode uses ADC3_IN1 as the positive input and ADC3_IN2 as the negative input.

The ADC3_IN2 pin isn't broken out on the LQFP64 package, so differential mode for ADC3 channel 1 is not available.

[Ankurgupta4u]

Thank you both, I have been trying to use PB0 and PB1 as differential inputs for ADC3 and had to install CubeMX since there are multiple docuements to refer. I still think it is a strange design choice. But I am able to configure OpAmp3 on PB0 and PB1 and direct the output to ADC3, which should address it without requiring design changes thankfully.

I would appreciate your advice about this approach.