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DM365 static power consumption

Uri Weinberg
Prodigy 70 points

Hello,

According to application report SPRAB68 (TMS320DM36x Power Consumption Summary), static power consumption of the core is 70mW and at deep sleep is 75mW. This leakage figure is very high. For the DM355 the equivalent number is 1.7mW (at deep sleep, from SPRAAZ5 page 6).

Could you explain the reason for the very high leakage in the DM365?

What can be done in order to get to <5mW at deep sleep mode? Power off is not a solution, especially with Linux that takes 20 seconds to boot

Thanks,
Uri

  • 0
    TI__Mastermind 41665 points

    uriw said:
    Could you explain the reason for the very high leakage in the DM365?

    The DM365 is designed more around performance than low power when compared to the DM355, it is in general a different part with different internal architecture and thus different power consumption properties.

    uriw said:
    What can be done in order to get to <5mW at deep sleep mode? Power off is not a solution, especially with Linux that takes 20 seconds to boot

    I am not sure that this is really possible outside of a power off solution. In this regard you could try to optimize your kernel boot to have it happen faster, however you would still be looking at a few seconds if you are bringing up core network and video functionality.

  • 0 in reply to Bernie Thompson TI
    Prodigy 70 points

    Bernie, Thanks for the answer.

    I don't understand the relation between performance and power consumption at  deep sleep mode.

    For portable applications this is a show stopper.

    Does TI plans a new revision that will fix it? Will it also remain with the DM375?

    Uri

  • 0 in reply to Uri Weinberg
    TI__Mastermind 41665 points

    uriw said:
    I don't understand the relation between performance and power consumption at  deep sleep mode.

    In general higher frequency devices will tend to trade off power efficiency for maximum attainable clock speed, this relates back to deep sleep mode by having a higher leakage current, I am not necessarily an expert in the subject but the power figures in the power consumption application note should be accurate regardless of the technical details of why.

    uriw said:
    Does TI plans a new revision that will fix it? Will it also remain with the DM375?

     As far as I know there are not any plans for a lower power DM365 spin, there is no announced device by the name of DM375 however any device that is similar to DM365 functionally (i.e. uses the HDVICP and ~300MHz+ ARM) will probably have the same sort of power characteristics.