Portenta H7 temperature sensor

Official Hardware Portenta Family Portenta H7
1

Hi,
Do the H7 has a onboard temperature sensor?
Maybe the midcarrier has one?
how to read it?
The STM32H747xI/G report having one but I don’t see how to access it from the code.

thank you

2

According to the documentation on the Arduino website it has a temperature sensor.
I did a Google search and found THIS

3

Thank you sosfcy.
interesting examples but I don’t see where it reads CPU temperature

4

Hi,

This will give you the MCU junction temp:

mbed::AnalogIn mcuADCVref(ADC_VREF);
mbed::AnalogIn mcuADCTemp(ADC_TEMP);
uint32_t mcuVref, mcuTemp;

void setup() {
  mcuVref = __LL_ADC_CALC_VREFANALOG_VOLTAGE(mcuADCVref.read_u16(), ADC_RESOLUTION_16B);
...
}
void loop() {
  mcuTemp = __HAL_ADC_CALC_TEMPERATURE(mcuVref, mcuADCTemp.read_u16(), ADC_RESOLUTION_16B);
...
}
5

Hi steve9,
thank you very much for the answer. It works!

I was unable to find any type of documentation or examples.
I mean I was aware of the internal temperature sensors from the STM datasheet, but how to go from that to the mbed/portenta implementation?

thank you

7 
void loop() {

  mbed::AnalogIn mcuADCVref(ADC_VREF);
  uint16_t mcuADCVref_u16=mcuADCVref.read_u16();
  uint32_t mcuVref = __LL_ADC_CALC_VREFANALOG_VOLTAGE(mcuADCVref_u16,ADC_RESOLUTION_16B);

  mbed::AnalogIn mcuADCTemp(ADC_TEMP);
  uint16_t mcuADCTemp_u16 = mcuADCTemp.read_u16();
  uint32_t mcuTemp = __HAL_ADC_CALC_TEMPERATURE(mcuVref, mcuADCTemp_u16,ADC_RESOLUTION_16B);

  Serial.println("mcuADCVref_u16:"+String(mcuADCVref_u16)+"     mcuVref:"+String(mcuVref)+" mcuADCTemp_u16:"+String(mcuADCTemp_u16)+" mcuTemp:"+String(mcuTemp));
}

Reading the vRef in the loop seems better, while reding once it in the setup gives unpredictable results (at least on my unit)

8

I'm using GIGA R1 so quite possibly differences in power management between the two. Glad it works for you and the Portenta.