Dm814x Power Management

Don Freiling

The TI white paper sprt495 "Power-Management Techniques for OMAP35x" discusses several mechanisms for reducing power consumption with the goal of extending battery life. These include:

-Dynamic Voltage and Frequency Scaling (DVFS)

- Adaptive Voltage Scaling (AVS)

- Dynamic Power Switching (DPS)

- Static Leakage Management (SLM)

Will these mechanism be available on the Dm8148 making it suitable for battery operated applications?

I am specifically concerned about the power consumption during IDLE periods when no threads are running. In this state the ARM processor is usually placed in the Wait-For-Interrupt (WFI) mode with its clocks gated off but with the PLL_ARM still locked to allow for fast (1 to 10 microsecond) wake up in response to an interrupt. My concern is that the ARM_PLL will draw too much current in this mode.

The more general question is: Does TI recommend the Dm814x for battery operated applications such as Tablets, and Portable Media Players?

Thanks!

Don

over 14 years ago

0 B.C. over 14 years ago

TI__Genius 16916 points

Don,

Yes, DM814x supports the the power saving mechanisms that you list. Please see Ch. 7 of the datasheet for more details. Although the power consumption has not be characterized yet on silicon, I would expect similar IDLE power consumption to OMAP35x.

Regards,

Brad

0 Don Freiling over 14 years ago in reply to B.C.

Prodigy 20 points

Brad,

Thank you for verifying this. I was concerned because Ch. 7 doesn't specifically mention DPS which is responsible for significant power savings during idle periods.

Regards,

Don

0 patrick nefos over 14 years ago in reply to B.C.

Expert 1850 points

BC said:

Yes, DM814x supports the the power saving mechanisms that you list. Please see Ch. 7 of the datasheet for more details. Although the power consumption has not be characterized yet on silicon, I would expect similar IDLE power consumption to OMAP35x.

Regards,

Brad

Ch 7 mentions "DM814x SmartReflex Application Report (Literature Number: SPRTBD)."

Do you have any detail on this?

Patrick

0 B.C. over 14 years ago in reply to patrick nefos

TI__Genius 16916 points

Patrick,

I believe the reference to that placeholder app note is being removed from the datasheet. Instead, the datasheet will like be updated with SmartReflex power supply requirements after the device is characterized, and a flexible SmartReflex software driver will be released from TI.

Regards,

Brad

0 Bonzai over 14 years ago in reply to B.C.

Expert 1025 points

Brad,

when will the TI will finishing the device characterized?

Thanks,

Bonzai

0 Steve Clynes over 14 years ago in reply to Bonzai

TI__Mastermind 43875 points

Bonzai,

There is no firm date yet for characterization to be completed and software to be written.

As soon as these tasks are complete the PSP will be updated to include driver support.

This is not likely to be completed until towards the end of the year.

BR,

Steve

0 Craig Matsuura85376 over 13 years ago in reply to Steve Clynes

Intellectual 745 points

What is the status of this?

If running on battery power what configuration is recommended for power savings?

Can we assume the OMAP35xx power setup is the same, with the same savings?

Where is a guide for setup? It is now almost a year since some people have posted questions regarding power savings and battery usage. I ahve seem posts besides these regarding power.

0 patrick nefos over 13 years ago in reply to B.C.

Expert 1850 points

Hi Brad,

Is there an update on SmartReflex driver you mention?

Patrick

0 MarcPyne over 13 years ago in reply to patrick nefos

TI__Mastermind 25055 points

Patrick,

It is being looked into, but there is not a definite schedule yet.

Regards,
Marc

0 paddu1 over 13 years ago in reply to MarcPyne

Expert 1195 points

Hello,

Could you please let us know if there is any updates on DM814x's SmartReflex support.

Should we assume that DM814x may not supprt SmartReflex at all.

Regards.

paddu

0 MarcPyne over 13 years ago in reply to paddu1

TI__Mastermind 25055 points

Hello,

Sorry, but there is still not a definite schedule yet.

Regards,
Marc

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Dm814x Power Management