reference voltage in STM32H743 for Calibration values TSCAL2 & TSCAL1 ?

[Saranraj]

What is the reference voltage did ST set in STM743 micro controller for temperature sensor for acquiring the Calibrated value TSCAL2 & TSCAL1 for 130*C and 30*C. Since during factory set How do ST Know What external voltage is going to come from design side ?

 

For Example If you set reference voltage 1.2V for 130*c then How do i scale it that if i give 2.5V external voltage for Vref ? Then calibrated value i am getting from internal is different from what i am expecting so it will throw error in calculation ? How do i know the information about factory set Ref voltage for TSCAL2 and TSCAL1 for maximum and minimum temperature ?

 

Is there any application note for calculating the temperature as per the reference voltage to get to know the internal calibrated value for TSCAL2 & TSCAL1 ?

[Saranraj]

Merging of two thread for the same subject.

what is the maximum temperature did set in STM743 micro controller during factory set for TS_CAL2 Calibrated value? Is it 110*c or 130*C for maximum temperature Calibrated value ?

 

Since STM743 Production Datasheet Rev 7, Table 191 shows for 110*C but in Rev10 shows 130*c for TS_CAL2. The given memory address is same for both revisions so i will get only one data under that

 

Rev7 STM743 Reference Document RM0433 in Section 25.4.33

 

Temperature (in °C) = 110 °C – 30 °C

-------------------------- × (TS_DATA – TS_CAL1) + 30 °C

TS_CAL2 - TS_CAL1

 

Rev8 STM743 Reference Document RM0433 in Section 25.4.33

 

Temperature (in °C) = TS_CAL2_TEMP – TS_CAL1_TEMP

------------------------------------------------------- × (TS_DATA – TS_CAL1) + 30 °C

TS_CAL2 - TS_CAL1

 

so I want to know that whether it is for 110*c or 130*c for max temperature Calibrated value.

[Saranraj]

What is the reference voltage for the internal temperature sensor this ti connected with internal ADC ?

 

[TDK]

The reference voltage for these readings is 3.3V +/- 10 mA.

 

[TDK]

The datasheet says it's 110 C for rev Y and 130 C for rev V. Presumably, the RM was changed due to it varying between revisions.

 

 

 

[Saranraj]

Hi TDK,

 

 Thank You for your reply. Yes I agree with you. But in my design i am giving 2.5V externally to the Vref pin of the IC. SO will it give wrong values for calculating the temperature since internally temp sensor  it is set(Calibrated) for 3.3V ?

How do i map it for 3.3V values  to 2.5V  ? 

 

Regards

Saranraj

[Saranraj]

Ok Thank you. What is the meaning of RM ?  may i Know ?

[TDK]

Reference Manual.

[Saranraj]

So What is the max temperature did set in for the controller for TSCAL2 during calibration? 110* c or 130*c ?

 

[TDK]

> So What is the max temperature did set in for the controller for TSCAL2 during calibration? 110* c or 130*c ?

As I said before:

> The datasheet says it's 110 C for rev Y and 130 C for rev V.

To find out what chip revision you have, connect to it with STM32CubeProgrammer and look in the bottom right. Typically, you will have the newer revision (V).

 

 

[Saranraj]

Hi TDK,

 

 Thank You for your reply. How do i know the revision number if my system is closed and what if its production board ???

[Christian N]

This post has been escalated to the ST Online Support Team for additional assistance. We'll contact you directly.

[Saranraj]

Hi TDK,

 

  I Got it. I agree with your points. I can map the value to 2.5V. But Both Rev 7 and Rev10 ST uC Datasheet shows different temperature in Rev V ?

In Rev 10

 

In Rev 7 DS

So While doing calculation which temperature should i consider for TSCAL2 when using below formula whether is it 110* or 130*C ? Please Calrify

And Addition to this One more query ?

How to read the internal temperature sensor output value converted by ADC (TSDATA) ? ?

 

Thanks 

Saranraj

 

   

[Saranraj]

Could you please tell me the memory address where ADC converted data(TSDATA) is Stored ?? How to read the ADC Converted data ? I have closed system so i am reading all the data through RS485 .

 

Regards

Saranraj

[TDK]

> Please Calrify

Datasheets are revised to correct information. Use the latest one.