Internal Temperature (TSENS0-1) in MPC5744P (MBD)

[abhishek_kumar1]

Hello 

I am using NxP Model Based Design Toolbox for MPC57xx an the micro used is MPC5744P (144LQFP)

I want to get the internal temperature (TSENS0 and TSENS1), as shown in below snapshot.

I looked into the ADC block (in Simulink Libraries) but ADC0 - 15 is not a electable option.

Is it because it is not available for 144LQFP and 257BGA (as in package column in the below snapshot it is grayed out for Package Availability, so a bit confusing. Ext pin should be grayed out but not the Package Availability).

If it is available, then how can I access TSENS0-1?

Thanks for your help. 

Best Regards,

Abhishek

[mariuslucianand]

Hello abhishek.kumar@chassisbrakes.com‌,

As I promised, here is a quick patch to have access to the internal temperature TSENS0 and TSENS1 on the MPC5744P. Officially it will be available in the next release on MPC57xx Toolbox. 

Please replace the p files in the folder src\mbdtbx_mpc574x\mbdtbx_mpc574x\mscripts\adc.

I've also attached an example on how to access the K0-3 values from Flash using custom code because unfortunately this release has no support for accessing a custom flash memory address but we will fix this in the next one. 

I got also inspired from this topic Example MPC5744P TSENS temperature calculation.

Waiting for your response,

Marius

[mariuslucianand]

Hello abhishek.kumar@chassisbrakes.com‌,

Did the attached files help you to measure the internal temperature on the MPC5744P?

Best Regards,

Marius!

[abhishek_kumar1]

Dear Marius

I get the reading for 0 degrees every time. Today I am not at work. I'll send you the model and screenshot on Monday.

Best Regards

Abhishek

[abhishek_kumar1]

mariuslucianandrei

Please see what I get in Freemaster (below snapshot)

Mostly I get 0.16 degree Celcius. Which seems to be a bit odd. 

The files you sent had incorrect channels selected in them for ADC so I edited the file a bit :smileyhappy:. Hope its okay. 

I have attached the files.

Thank you for help.

[mariuslucianand · Accepted solution]

Hello abhishek.kumar@chassisbrakes.com‌,

I finally managed to find what's wrong in your model.

1. In the ADC Config Block it has no influence the order of the channels, because in the result the refPMC will be the first result and the TSENS will be the second result. The results are ordered after the channels number this case AN10 and AN15.

2. After that I've compared the raw ADC outputs from your model and mine. The raw values were the same so the problem was in the conversion formula, which was modified that the one from the model attached. So I've found two things: The first one is that the inputs for the Conversion Subsystems were reversed: refPMC with the TSENS, and this is the reason why I started with a little explanation at the first point. 

The second reason is that one gain for the formula was applied only on the second member of the sum and not for the entire sum. In the following screenshot I've highlighted the old position vs the right one. 

I've also added the Kelvin to Celsius conversion for the Temp0 and this is the FreeMaster screenshot. I've also attached the model with the TSENS0 formula changed and the FreeMaster project too.

Hope this helps you!

I'm waiting for your reply!

Best Regards, 

Marius

[abhishek_kumar1]

Dear mariuslucianandrei‌

It works now.

And thank you for letting know the that data stream is arranged based on channel number. 

Best Regards

Abhishek

[abhishek_kumar1]

Dear mariuslucianandrei‌

I can not see the patch!

Best Regards

Abhishek

[mariuslucianand]

Sorry abhishek.kumar@chassisbrakes.com,

I hit Add Comment too soon. They shout be available now!

Marius

[mariuslucianand]

Hello abhishek.kumar@chassisbrakes.com‌,

Right now the toolbox does not allow the user to measure the internal uc temperature. Let us investigate this and we will provide a way to measure it soon.

Best Regards, 

Marius

[abhishek_kumar1]

Dear mariuslucianandrei‌

Thank you.

Will you reply on the same question once you have the solution?

Best Regards

Abhishek

[mariuslucianand]

Hello abhishek.kumar@chassisbrakes.com‌,

I will reply here the proposed solution probably at the beginning of the next week.

Best Regards, 

Marius