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TMS570LC4357: Power Estimator

Kendall
Prodigy 60 points

Part Number: TMS570LC4357

Is there a power estimation tool for the Hercules microcontrollers?  If a tool/spreadsheet is not available then, is there a detailed guide to estimating power based on clock rates, power domains (on, idle, off), outputs used, etc.?

  • 0
    TI__Mastermind 49120 points
    Hi Kendall,

    The TMS570LC4357 datasheet includes a table that summarizes the power consumption for the different supplies required for the part's operation. This table's footnotes include a formula that can be used to estimate the impact on the power consumption if you run at a lower operating frequency, or at a lower junction temperature. There are no individual power domains on the LC4357 part that can be turned off.

    Regards,
    Sunil
  • 0 in reply to Sunil Oak
    Prodigy 60 points

    Sunil,

    • In Section 6.1 of the datasheet, there are six power domains the can be managed by software.  Each can be turned ON, IDLE or OFF.
    • In Section 6.6.2 of the datasheet there are 10 clock domains that can be managed by software including being disabled.
    • Datasheet sections 7.1.1, 7.2.1, 7.3.1 and 7.7.3 refer to "Peripheral Power Down" The ability for software to place peripherals in/out of a pow down state.

    Are none of these power features affecting the TMS570 power estimate?  If they do, how can I quantify it?

    Thanks,

      Ken

  • 0 in reply to Kendall
    TI__Mastermind 49120 points
    Ken,

    There are no actual power switches implemented for these "power domains", so they cannot be turned OFF. The only feature available is to gate the clocks off to each of these individual domains (IDLE). You can also gate the clock off to each peripheral via the peripheral control registers (PCR). However the leakage current component tends to dominate the total power consumption, and you will not see any significant reduction in the power consumption, especially at higher (>= 75C) temperatures. This is also the reason why the datasheet does not include leakage current numbers or individual power domain current consumption numbers.

    Regards,
    Sunil