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TM4C129XNCZAD: Expected current on VDD lines before programming?

Sean Rauchfuss
Intellectual 1035 points

Part Number: TM4C129XNCZAD

Posting for a customer:

For TM4C129XNCZADT3R microcontroller, what is the expected current on all VDD lines at +3.3V combined for a microcontroller that has never been programmed?

  • 0
    TI__Guru*** 135355 points

    Hello Sean,

    I don't think we've actually spec'd that... the key here would be that the ROM boot loader would be configured and in general its going to be looking some sort of communication to trigger a download so there is some current draw from that. 

    Maybe to take a step back, what is the intent of trying to understand that?

    Best Regards,

    Ralph Jacobi

  • 0 in reply to Ralph Jacobi
    Prodigy 130 points

    I want a simple test of the assembly and current draw is easy to measure.

  • 0 in reply to John Boecker
    TI__Guru*** 135355 points

    Hello John,

    With the right setup its easy to measure but I don't have access to such a setup at this time. The evaluation board I have for TM4C129XNCZAD has a number of other components on it including an LCD display so it isn't well suited for this sort of current measurement. I will check with a colleague when he returns next week if he has any data like this or an evaluation to gather such but this is really the first time we've been asked for such a spec so it may not be something we can provide.

    Best Regards,

    Ralph Jacobi

  • 0 in reply to Ralph Jacobi
    TI__Guru*** 135355 points

    Hello John,

    After discussing it further, our expectation is that the device will run based on the PIOSC while in the ROM Boot Loader so the run current for the Flash Loop with all peripherals on (there is an Ethernet boot loader which is configured and waits for magic packet) which can be looked up on Table 32-75 Current Consumption. At 25 C, we'd expect 24.4 mA current draw per that table:

    Best Regards,

    Ralph Jacobi