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<section begin="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" |First release
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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:#ededed; padding:5px; color:#000000" |Add temperature thresholds information
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<section end="History" /><section begin="Body" />
== Thermal management ==
DAVE Embedded Systems' team is available for any additional information, please contact [mailto:sales@dave.eu sales@dave.eu].
=== Temperature sensor on SOC ===
The internal temperature sensor of iMX8M Mini/Nano SOC has some limitations regarding the operative range (from 10 to 105°C) and the precision (±5 accuracy).
If the operative temperature is a crucial parameter on the system where MITO 8M Mini/Nano is integrated, we suggest adding one or more temperature sensors on the carrier board in order to overcome these limitations.
In the following '''Software thermal protection''' chapter, the implementation of reading and trip points management are referred at the internal SOC temperature sensor.
=== Heatsink suggestion ===
The MITO 8M Mini/Nano SOM is designed with two four holes that allow to mount a heatsink directly on the CPU IC.
===Software thermal protection ===
In [[DESK-MX8MX8M-L| DESK-MX8M-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 Consumer parts
====U-Boot====
At U-Boot level, automatic boot procedure is halted until Tj is smaller greater 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):
*'''TBD''' 85°C for Consumer parts
*95°C for Industrial parts
====Linux kernel====
At Linux level, a more sophisticated protection mechanism is implemented. Please refer to the following sections for more details.
*for Consumer parts
** passive threshold: '''TBD'''85°C** critical threshold: '''TBD'''90°C
*for Industrial parts
** passive threshold: 85°C95°C** critical threshold: 95°C100°C
**
thermal thermal_zone0: critical temperature reached(95 C),shutting down
</pre>
To resume the CPU from the shutdown, the CPU_ONOFF signal must be externally managed. Please contact [mailto:sales@dave.eu sales@dave.eu] for any additional information.
By default, temperature thresholds are set up as follows:
[[Category:MITO 8M Mini]]
[[Category:MITO 8M Nano]]