Hello @emre ÖZDEMİR ,
STM32 series value line does have only one calibration point. Other ones have two calibration points.
In LL driver, there are 2 macro available to help you to compute temperature from ADC raw conversion data.
- __LL_ADC_CALC_TEMPERATURE(): requires 2 calibration points, most accurate since specific to each sample.
- __LL_ADC_CALC_TEMPERATURE_TYP_PARAMS(): uses typical parameters from datasheet, generic to all samples.
Here is a proposal to use this macro:
#define VDDA_APPLI ((uint32_t) 3300) /* Value of analog reference voltage (Vref+), connected to analog voltage supply Vdda (unit: mV) */
#define TEMPSENSOR_TYP_CAL1_V (( int32_t) 760) /* Internal temperature sensor, parameter V30 (unit: mV). Refer to device datasheet for min/typ/max values. */
#define TEMPSENSOR_TYP_AVGSLOPE (( int32_t) 2500) /* Internal temperature sensor, parameter Avg_Slope (unit: uV/DegCelsius). Refer to device datasheet for min/typ/max values. */
#define TEMPSENSOR_CAL_VREF ((uint32_t) 3000) /* Vdda value with which temperature sensor has been calibrated in production (+-10 mV). */
temperature_degC = __LL_ADC_CALC_TEMPERATURE_TYP_PARAMS(TEMPSENSOR_TYP_AVGSLOPE,
TEMPSENSOR_TYP_CAL1_V,
TEMPSENSOR_CAL1_TEMP,
VDDA_APPLI,
temperature_raw_data,
LL_ADC_RESOLUTION_12B);
You can optimize accuracy by using offset calibrated data instead of generic value (literal TEMPSENSOR_TYP_CAL1_V above).
Best regards
Philippe
