Processor getting heated up

santosini biswal

Hi ,

I am using OMAP4460 for an application. According to the specification, the processor can supported upto 1.5GHz and full HD (1920x1080p) resolution video.

But recently I noticed that as the frequency reaches 1.5 GHz the CPU gets heated up.

Similar with usage of 1080p resolution (on display DPI not HDMI).

Can anyone please guide me on this.

Thanks & Regards,

Santosini

over 13 years ago

0 Venkat Ramana Peddigari over 13 years ago

TI__Expert 4120 points

Hi Santosini,

As per my understanding, when the processors are driven at their maximum frequency the device gets heated up at a rapid pace and therefore to avoid overheating, thermal management policy is required which will ensure that the device is not driven at Max frequency all the time. It will lower the device frequency for the optimum duty cycle and then ramp it to higher frequency automatically.

Thanks & Best Regards,

Venkat

0 santosini biswal over 13 years ago in reply to Venkat Ramana Peddigari

Prodigy 80 points

Hi Venkat,

Thanks for the response. Agree with you regarding frequency. Regarding the 1080p display, here is the brief discription:

When a video is transmitted over HDMI to a TV, the threshold current (1.9A) is crossed and the board reboots.

Along with this, the processor IC is also getting heated up.

Can you suggest something regarding this..?

Regards,

Santosini

0 Chintan Patel over 13 years ago in reply to santosini biswal

TI__Intellectual 1410 points

Which release are you using Linux or Android? Which development platform is being used Blaze or Blaze Tablet?

Regards,

Chintan

0 santosini biswal over 13 years ago in reply to Venkat Ramana Peddigari

Prodigy 80 points

Hi Venkat,

As referred by you in the above response that in case of overheating, a "thermal management policy is required which will ensure that the device is not driven at Max frequency all the time", I wished to know whether this thermal management in automatic (existing as default with the processor) or has to be enabled using hardware/software.

Kindly provide your suggestions.

Thanks & Regards,

Santosini

0 Venkat Ramana Peddigari over 13 years ago in reply to santosini biswal

TI__Expert 4120 points

Hi Santosini,

Are your using the Ubuntu GLP release or Android? Please let us know the exact release you are working with. If you are on the latest 4AI.I.4 ICS Android release, the software patch for the thermal management should be part of the release. For Ubuntu GLP releases, you may have to enable it using some patches based on which release you are working with.

Thanks & Best Regards,

Venkat

0 santosini biswal over 13 years ago in reply to Venkat Ramana Peddigari

Prodigy 80 points

Hi Venkat,

We are using 4AI.1.4-P1_OMAP4_Icecream_Sandwich_Release_Notes Android released on May 21.

Hence, Can I assume that the thermal management is a PART of the release and will act automatically once a processor heating issue is detected..?

Regards,

Santosini

0 Alex Trinh over 13 years ago in reply to santosini biswal

TI__Intellectual 815 points

Hello Santosini,

Yes, the thermal management policy is enabled automatically as part of this SW release. Therefore, it will automatically kick in once the temperature threshold is crossed.

If this happens, you will see a terminal message appear: "...temperature too high, cpu throttle at max [frequency]" Then when the temperature cools down again, it lifts the frequency limit.

Regards,

Alex

0 santosini biswal over 13 years ago in reply to Alex Trinh

Prodigy 80 points

Thank you guys for the useful info.

Regards,

Santosini

0 Haran Ashok over 13 years ago in reply to Alex Trinh

Expert 1175 points

Hi alex,

Actually we dont get those messages and the system reboots.We get the following message when the system reboots.

[ 515.941802] emif_threaded_isr 1: SDRAM temperature exceeds operatinglimit.. Shutdown system...
[ 516.021759] PVR: PVRSRV

Texas Instruments X-Loader 1.41 (Jun 13 2012 - 19:21:00)
OMAP chip temperature is too high!!!
Please power off and try booting after sometime

Regards

Haran

0 Venkat Ramana Peddigari over 13 years ago in reply to santosini biswal

TI__Expert 4120 points

Hi Santosini,

Thanks for confirming that your query has been clarified. Could you please check the Verify Answer so that this post can be closed?

Best Regards,

Venkat

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Processor getting heated up