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TE0720 temperature while running under "load"

Started by public_id_thorax, November 22, 2014, 09:16:49 AM

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public_id_thorax

Hello,

Do you have any information regarding the temperature of the ZYNQ chip on the TE0720 under different conditions? Ideally, what we would like to know is:

- Temperature of the ZYNQ IC while running Linaro (no special application, just the OS is up and running) in room temp.
- Temperature of the ZYNQ IC while running Linaro, when CPU utilization is greater than %50 for both cores, in room temp.
- The above data, when the ambient temp is 60 degrees.

Currently we are using another ZYNQ board which is at least 2x the size of TE0720 and it gets to around 70degrees in room temp, when it is not really running anything worthwhile. Since the TE0720 is smaller, the natural convection path is going to be more difficult, so I am worried that the temperature will be even more.

We need some information on the temperature behavior of the board. Any information will be appreciated.

Antti Lukats

You are right the PCB size does have impact on heat and junction temperature. The CLG484 package has bad junction to case and junction to ambient figures, also the thermal path via PCB is not sufficient for high ambient. At 60C ambient heatsink/spreader is needed 100% that can we say. There are some power optimizations that can be done, but they do not so significant power unfortunately.

The CPU load does not have that much impact on the total power as you may think.

The bad thing is that with temperature rise the power consumption rises also because the leakage current of the Zynq increases.

We have both low power and automotive Zynq modules coming soon, but they will not be 100% compatible to TE0720.

TE0720 consumes about 2.5W "all peripherals active, O/S loaded".

TE0720 with rather heavy load can be used in closed metal enclosure with no airflow outside, but there may be need to attach a passive heatsink or even add small fan to circulate the air in the enclosure. TE0720 in very small closed plastic enclosure and absolutely no airflow may make trouble as the inside air temperature would rise very high as the plastic does conduct heat out.

Our 7010 automotive design consumes between 1.1W to 1.6W during boot stages, with 1.25-1.4W when O/S loaded, 100mbit Ethernet active state.

Please drop an email to support@

we can discuss the options and look closer into your requirements.




public_id_thorax

Thanks very much for the thorough answer.

When you say "OS loaded, peripherals active" for 2.5W consumption, can you clarify:

- Is GIGe connected and/or is there data transmission taking place?
- Is CPU freq >=600 Mhz and DDR freq > 400 Mhz, or are other frequencies being used?
- Are I/O banks at 3.3V and are any of the IOs toggling?

Regards,