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MITO 8M SOM/MITO 8M Hardware/Electrical Thermal and Mechanical Features/Thermal management and heat dissipation

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!colspan="4" style="width:100%; text-align:left"; border-bottom:solid 2px #ededed"|History

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~~|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|TBD~~

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DAVE Embedded Systems' team is available for any additional information, please contact [mailto:sales@dave.eu sales@dave.eu].

~~'''TBD: le sezioni qui di seguito vanno documentate e completate in funzione delle funzionalità del SOC (iMX6, iMX6UL, Zynq, etc.) e della diposnibilità di sensori di temperatura a bordo del SOM'''~~ ===Software thermal protection ~~''TBD: se applicabile''~~ ===

In DESK-MX8-L, two software thermal protection mechanisms are implemented. Both are based on the processor's temperature sensor. It is worth remembering that maximum junction temperature (also denoted as Tj in the rest of the document) is:

*95°C for ~~commercial~~ Consumer parts*105°C for ~~extended commercial and industrial~~ Industrial parts*125°C for automotive parts.

====U-Boot====

At U-Boot level, automatic boot procedure is halted until Tj is smaller than (following temperatures might seem excessively low but they take into account the intrinsic poor precision of the temperature sensor to provide a reasonable safe margin):

*80°C for ~~commercial~~ Consumer parts*90 90°C for ~~extended commercial and industrial~~ Industrial parts*110°C for automotive parts.

====Linux kernel====

The default temperature thresholds depend on the silicon grade, as follows:

*for ~~commercial~~ Consumer parts

** passive threshold: 85°C

** critical threshold: 90°C

*for ~~extended commercial and industrial~~ Industrial parts

** passive threshold: 95°C

** critical threshold: 100°C

*~~for automotive parts~~** passive threshold: 115°C** critical threshold: 120°C.

Practically speaking, for DESK-MX8-L this mechanism makes use of two different thresholds, denoted as <code>trip_point0</code> (also known as ''passive threshold'') and <code>trip_point1</code> (also known as ''critical threshold)''.

When Tj reaches <code>trip_point0</code>, Linux kernel scales down processor frequency:

U0005

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