STM32H723 Analog Temperature Measurement Alarm

[ToddA]

All:

I have connected internal temperature to ADC3, and I am able to display degrees C on "Live Expressions". 

The particular chip we are working with has an operating range of -40 C to + 85 C. If I am monitoring the internal temperature on a regular basis (once per second), is there a temperature that would be good for fault condition?

I am assuming I do not want to fault at 85 C, but is there a temperature that people have generally used as a condition to fault? (Is 75 C a good temperature to raise an alarm?) By the way, my Nucleo board generally runs at 30 C, after starting at roughly 26 C when first powered.

Regards,

Todd Anderson

[Andrew Neil]

---

@ToddA wrote:

The particular chip we are working with has an operating range of -40 C to + 85 C

---

That's the ambient temperature range - the internal chip temperature will be higher.

Does the datasheet give a figure for the chip-to-ambient thermal resistance?

[ToddA]

Thanks for clarifying. It looks like internal temperature could go as high as 125 C. 

I will monitor the temperature and compare to ambient board temperature, and will probably determine a fault condition based on that.

Regards,

Todd Anderson

[SofLit · Accepted solution]

Indeed. The internal temperature sensor measures the Junction temperature (TJ) which should not exceed 125°c for the industrial temperature range 6.

From the datasheet: