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i.MX 8M Mini TMU temperature readout problem

Question asked by Ralf Goebel on Mar 20, 2020
Latest reply on Apr 14, 2020 by Ralf Goebel

Hello,

 

We have a new custom hardware using the i.MX 8M Mini SoC (commercial grade).

 

The temperature values reported by the TMU seem to be incorrect. At case temperatures of about 20°C ... 35 °C, I see the following values reported by U-Boot: 16°C, 18°C, 24°C, 28°C, 32°C, 36°C, 64°C, 72°C, 112°C.

Above 35°C, the temperature reading fails.

The same problem occurs within Linux.

 

Is there some temperature calibration required for the TMU?

 

Thanks,

Ralf

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