Can't get reasonable values from the internal temperature sensor in nucleo-g474re board.

[BSale.1]

#define TEMP110_CAL_VALUE ((uint16_t*)((uint32_t)0x1FFF75CA))
#define TEMP30_CAL_VALUE ((uint16_t*)((uint32_t)0x1FFF75A8))
#define TEMP110 110.0f
#define TEMP30 30.0f

I am using these calibration values as I found them in the datasheet

For the conversion:

temperature = (int32_t)((TEMP110 - TEMP30) / ((float)(*TEMP110_CAL_VALUE) - (float)(*TEMP30_CAL_VALUE)) * (adcvalue - (float)(*TEMP30_CAL_VALUE)) + TEMP30);

I also used:

temperature=__LL_ADC_CALC_TEMPERATURE(VDDA_APPLI,AdcVals[0],LL_ADC_RESOLUTION_12B);

The values I get is 700-800 on the ADC value, which I think is a reasonable value but when converting the temperature is with a minus sign

[S.Ma]

Look at nucleo G4 adc examples. First, did you calibrate the adc? What is adc supply voltage? Did you compensate for it ? How long is the adc sampling time?

[BSale.1]

• I did not calibrate the ADC, how to do so?
• Jumper 8 is on 1 and 2
• I am using 247.5 cycles for the temperature sensor

[TDK]

Per the datasheet, the calibration values are taken using VDD=VREF+=3.0V. The nucleo board uses 3.3V.

To correct for this, adjust the raw values you get from the ADC by multiplying by 1.1.

[S.Ma]

Even better, meaure vdda through vref adc measurement to have adaptive code.

[BSale.1]

Thank you all for your help