VREFBUFF is not available in STM32L431RCTx, How to enable External ADC reference?,

[AGeor.1]

VREFBUFF is not available in STM32L431RCTx series, in datasheet it tells that "internal voltage reference buffer is not available", is there any other option to give External ADC reference for this series of STM32.

[waclawek.jan]

> is there any other option to give External ADC reference for this series of STM32.

No.

JW

[AGeor.1]

than what will be default ADC reference ? is it 2.5v are 3.3v in this case

[waclawek.jan]

ADC reference is always what's on the VREF+ pad, which in the STM32L431Rx is internally bonded to VDDA. So, in your case, the ADC reference is whatever voltage is on VDDA (in respect to VSSA).

JW