DM814x Power Estimate Spreadsheet: does it wrongly predict power too high?

MarkSB

I am trying to calculate the power consumed by a new design, which will use a DM8147 or DM8148 (industrial temperature range).

I have tried using two revisions of the Power Estimate Spreadsheet:

DM814x_AM387x_PowerSpreadSheet_RevB.xls

DM814x_AM387x_PowerSpreadSheet_RevE0.xls

When I enter the same design parameters on both, I get a large difference in predicted power consumption:

RevB predicts >1.9 W

RevE0 predicts <1.6 W

This is of great concern to me as I have very little power available in my application.

I assume the Power Estimate Spreadsheet is based on the parameters of actual parts. I understand that production Commercial/Industrial DM8147/DM8148 are only just becoming available so I am imagining that the spreadsheets I have are based on pre-production, development parts.

How can I find out what the power consumption of the final, production Industrial DM8147/DM8148 will be?

Have TI got any data I can have, indicating if the power consumption of production Industrial DM8147/DM8148 is better than development parts?

Thank you for your help.

DM814x power.zip

over 13 years ago

0 Viet Dinh over 13 years ago

TI__Genius 15310 points

Hi Mark,

Our latest RevE is our latest and greatest power estimation tool base on our bench test.

BR,

Viet

0 MarkSB over 13 years ago in reply to Viet Dinh

Prodigy 20 points

Hi Viet,

Thanks for your prompt reply. I do see that RevE is the latest published power estimation spreadsheet.

However, I'm looking to find out what the Commercial/Industrial production parts will consume.

We have a development board containing an 'X'-marked (experimental/pre-production) DM8148. But its power consumption doesn't match the RevE spreadsheet, or RevB.

How do we go beyond the RevE spreadsheet and find out about the power consumption of these forthcoming parts?

Thanks again...

Mark

0 John Langworthy over 13 years ago in reply to Viet Dinh

Prodigy 40 points

Viet,

Can you advise if your latest tests were done on production or experimental silicon?

What is the reason for the difference between the values predicted for the two revisions of the power estimation tools (B and E)?

Regards,

John

0 Viet Dinh over 13 years ago in reply to John Langworthy

TI__Genius 15310 points

Hi John,

The spread sheet is base on the production silicon. The updated for Rev E is in Revision page of the spread sheet.

BR,

Viet

Processors

Processors forum

DM814x Power Estimate Spreadsheet: does it wrongly predict power too high?