AM3703: Calculating Theta J

Viktorija Cecil

Part Number: AM3703

Team,

My customer is testing their boards that use AM3703CUS100. Processor is running at 1GHz, and it's case/package temp is 78C at 22C ambient.

They would like to calculate the Theta J to make sure the device is not running outside it's spec, so to avoid any degradation in performance/ shortened life span.

Can you help point us in the right direction, please?

Note, this board is scheduled for production before Chinese New Year, so anything you can do to help with the answer would be greatly appreciated.

Thanks

Viktorija

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Hi,

You can refer to this wiki for necessary calculations: processors.wiki.ti.com/.../AM335x_Thermal_Considerations

Theta-JB is listed in section 7.1 from the AM37x Datasheet Rev. F.

0 BRIAN DOTSON over 9 years ago in reply to Biser Gatchev-XID

Prodigy 60 points

Hello, Biser.

This is a very rigorous treatment of how to estimate junction temperature! The 1 GHz Dhrystone performance copied below was especially useful.

File:JvA Dhry dis.png

I am going to assume that running our build at 1 GHz is roughly equivalent to running this Dhrystone benchmark, and proceed accordingly.

Question answered :-)

Thanks very much!

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AM3703: Calculating Theta J