in STM32F373 SDADC example for RTD measurement and I am getting huge noise in raw ADC and RTD temperature variation after configuring other peripherals like TSC and SPI for LCD.

[VK Verma]

I have used SDADC RTD temperature measurement example from \STM32Cube\Repository\STM32Cube_FW_F3_V1.10.0\Projects\STM32373C_EVAL\Examples\SDADC\SDADC_TempMeasurement

with the same micro STM32F373 and I am getting huge noise in raw ADC and RTD temperature variation after configuring other peripherals like TSC and SPI for LCD. Whereas when I comment these, readings of temperature are stable and accurate. 

Can anybody tell me from where this noise is coming from?

 I have checked on CRO and confirmed that there is no noise on the SDADC pin after running LCD and TSC, which indicates me that problem is in internal configuration of the micro.

Thanks in advance.

VK Verma

[AvaTar]

EMI or noisy/unstable power supply ?

VDD and VDDA not separated ?

[VK Verma]

Hi !

If i presume that power supply is noisy or EMI problem then why it is perfectly working when we not enabling SPI or TSC peripheral? which is further verified by CRO and found no noise. Then do you think we need to suspect on this?

Regards,

VK Verma