AM335x Low Power considerations

Prad1

Other Parts Discussed in Thread: AM3352

Hi,

We need some advice on reducing the Heat dissipation with AM3352.
with several tests, the Heat dissipation on our customer's prototype board(AM3352)
seems to rise till 105°C.

But the device itself is industrial junction temperature(-40 to 90°C)
and we would like to know if there is any way to reduce the Heat dissipation
like using "low power modes", "layout design" etc.

The prototype board is desined as per the Schematic_Checklist on the wiki page,
please let us know if there is anything else or recommendations in such case.

Regards,
Prad.

over 12 years ago

0 Biser Gatchev-XID over 12 years ago

TI__Guru**** 393215 points

Hi Prad,

105°C is quite surprising. Is this the board temperature? What is the ambient temperature? Have you established correct OPP's for your processor speed grade?

0 sviss over 12 years ago in reply to Biser Gatchev-XID

Expert 1530 points

Any GPIOs grounded?

0 Prad1 over 12 years ago in reply to sviss

Genius 3825 points

Thank you for the comments,
I am sorry, I forgot to mention the details, actually there are other components on customer's board
spreading heat like Ethernet PHY, LCD interface etc.
And also the board itself is very compact with Plastic Enclosure which inturn induces more heat.

They are also trying to optimise the surrounding temperature,
also wants to know if there is any possible ways to reduce the heat from AM335x like reducing the
power consumption.

They are planning to change all the I/O domains from 3.3V to 1.8V so that by reducing the
I/O voltage they may reduce the power consumption.

Meanwhile, we would like to know if there is a particular IO domain that is not used in the
application, is it possible to leave the power pins open for that particular domain.
For example if the "VDDSHV4" IO domain is not used can we leave the voltage rail for VDDSHV4 open?

Regards.
Prad.

0 Biser Gatchev-XID over 12 years ago in reply to Prad1

TI__Guru**** 393215 points

All power supplies have to be connected. The exceptions can be found here: http://processors.wiki.ti.com/index.php/AM335x_Schematic_Checklist#Unused_Power_Rails.

They might want to check their operating frequency/voltage (processor OPP) too.

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AM335x Low Power considerations