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Power consumption comparison between F28335, F28069

Mathieu TARRIUS
Intellectual 900 points


Hi,

I would like to have a comparison of power consumption of these 2 MCU (only the core consumption, ALL the peripheral disable).

For the F28335, in SPRS439L is indicated: The baseline Idd when the core is executing a dummy loop .. at 150Mhz.. : is 165 mA

For the F28069, in SPRS698E is indicated: The baseline Idd when the core is executing a dummy loop .. at 90Mhz.. : is 40 mA  (72 mW   Vdd:1.8V)

I guess we may suppose that : For the F28335 at 90Mhz.. : is around 100 mA  (180 mW   Vdd:1.8V)

So does it mean that the core power consumption of the F28335 is two times higher that one of the F28069 ?

However both have a: TMS320C28x CPU and same FPU unit.

Am I wrong ? Could you indicate to me if I am wrong ?

Thanks for your answer

MT

  • 0
    Guru 30330 points
    Mathieu,

    I will take a look at this and get back to you.

    Based on the datasheet, yes, the F28335 would consume almost double the power of F28069. I will reply back with a detailed explanation.

    Thanks,
    Mark
  • 0 in reply to Mark Labbato
    Intellectual 900 points
    Hi Mark,
    I am very interested. Thanks in advance. I am waitting for your detailed explainations.
    Regards,
    MT
  • 0 in reply to Mathieu TARRIUS
    Guru 30330 points
    Mathieu,

    F2833x was designed a few years before F2806x. If you notice, the F2833x is running at 1.9 V core voltage to reach 150MHz. If you wish to only run at 90MHz, you are able to decrease the supply voltage to 1.8 V. This would account for about 10% current increase from 1.8V to 1.9 V. The transistor count and die size are significantly smaller on the F2806x. This may not necessarily lead to a linear decrease in current consumption. Also, there were some various design improvements made between F28335 and F2806x that specifically targeted power consumption.
    In summary, while the C28x core is the same, the improvements in the design between F2833x and F2806x have lead to reduced current consumption in similar situations.

    I hope this answers your questions!

    -Mark
  • 0 in reply to Mark Labbato
    Intellectual 900 points
    Thanks a lot Mark for your explainations. It is what I wanted to know.
    Do you know if a new version for the F28335 is scheduled with the optimization done on the F28069 ? or there is a new device equivalent ot the F28335 with the new power consumption optimizations ?
    Regards,
    Mathieu
  • 0 in reply to Mathieu TARRIUS
    Guru 30330 points

    Mathieu,

    Following the F28335 product line, the next device is the Delfino Single-Core (F2837xS) or the Dual-core F2837xD. at equivalent performance (~90 MHz) the F2837xS will be consume around 250 mA. at 1.2 V this is ~300mW.  The next device in the Piccolo family is the F2807x. This will consume roughly the same power as F2837xS at a similar frequency.

    Please note that The current consumption referenced above is under operational conditions (peripherals running, CPU is active, etc) not just a dummy loop. 


    Check out our product page for a full breakdown of what types of features we can offer! We are continuously improving our designs and offer a wide variety of performance that can be scaled to your needs.

    -Mark

  • 0 in reply to Mark Labbato
    Intellectual 900 points
    Thanks Mark
    Regards, Mathieu