AM623: AM6232ATCGGAALW

Hello Lin Yang, 

Thank you for the query.

lin yang said:

AM6232ATCGGAALW  Tc 80.5℃（Tj83℃） .TPS6521903RHBR Tc 77.5℃. But 2 of them failed the test,First  failed after 17 hours,second failed after 43 hours .

Please elaborate what you meany by fail and how you are measuring the temperature.

Can i assume the testing is done with some enclosure.

Regards,

Sreenivasa

Hi  Sreenivasa,

Add more details about the test: the test is running in a oven.

In the high temp test, AM6232 will run with certain program whose memory will be occupied with about 80-90%.  But after 17 hours, it shows that the memory has been occupied above 100%. Once reach 100%, the test will be seen as fail.

In our temp test, the chip works well.

Could u kindly help to give some advise？ thanks！

Hello Lin Yang, 

Thank you.

Zoey Wu said:

In our temp test, the chip works well.

Please elaborate. I assume the above is the temp test. 

Please share details about the memory used and if the program that you run for testing is a standard or proprietary program.

Regards,

Sreenivasa

1、Firstly, I need to clarify that the  CPU loading is100%，not the memory. 

2、Please elaborate what you meany by fail and how you are measuring the temperature.

-->When the processorload reaches 100%, the testing program will automatically stop.

    As mentioned earlier,generally the testing program results in processorload of @ 85%~93%.

    We read the AM6232 T-junction via command ,we measure the T-case via thermocouple sensor.

3、Can i assume the testing is done with some enclosure.

   -->Yes ，we do the test in a thermal chamber.

4、This is a proprietary program designed for testing.

Hello Lin Yang, 

Thank you.

lin yang said:

I need to clarify that the  CPU loading is100%，

I checked internally and we need more details to review internally or support. Help me understand what you mean by CPU loading of 100%.

Please share the commands you are running to load the CPU to 100%.

Regards,

Sreenivasa

Hi  Sreenivasa, 

   The command is "top"-->the CPU loading85~93%

-->the CPU loading100% ,Command provided by our software supplier, we will ask again

Hello Lin Yang, 

Thank you.

Let me know when you receive inputs from the supplier.

Here are some additional inputs i received 

The thread is confusing, but the way I am reading it they are monitoring CPU load and when it reaches 100% the test asserts an exception via some watchdog monitoring process load and the test is a fail. I’m not sure the relationship they are trying to draw to temperature. They are specifying a Tj of 83C which is well within ROC and will not cause issues.

 It seems the application is loading the processor to 100% which is the issue. They would need to confirm that they have some watchdog monitoring for 100% processor load and if this is the issue they are trying to resolve. I am also not clear why they consider 100% processor load to be an exception.

Regards,

Sreenivasa 

Hi  Sreenivasa, 

           Our calculation method is different from the supplier's, and their results will be greater than ours.

The following is the loading calculation formula they used:

（（user  + nice+system+idle +iowait+ irq + softirq +steal + guest +guest_nice）-（idle +iowait）））/（user  + nice+system+idle +iowait+ irq + softirq +steal + guest +guest_nice）

Hello Lin Yang, 

Thank you.

Can you review my precious message and provide your thoughts on the cause of software stopping at 100% CPU loading.

Regards,

Sreenivasa