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TMS570 current on original power-up

Alan Day
Intellectual 920 points
Other Parts Discussed in Thread: TMS570LS3137

Hi,

I see in the TRM that the normal current consumption of the TMS570LS3137 is around 200mA for the core and possibly up to another 100mA in my configuration.

This is the first time I have powered up the board containing the TMS570 and the TMS570 seems to be wanting to draw a current greater than 300mA in its unconfigured state.

My question is what current draw is expected with JTAG (XDS100) attached?

Cheers,

Alan

  • 0
    TI__Guru 59540 points

    Hello Alan,

    I have forwarded you question to one of our TMS570LS3137 experts. They should be able to give you some typical current draw numbers for this device on an HDK "out of the box."

  • 0 in reply to Chuck Davenport
    Intellectual 920 points

    Hi,

    Has anyone had a chance to look into this for me, its very important to know this when debugging.

    Cheers,

    Alan

  • 0
    TI__Mastermind 49120 points

    Hi Alan,

    The 200mA number in the datasheet is what we expect for a typical part (nominal process) under typical voltage and temperature conditions. The specific part that you are using could be from a batch that was running "hotter" (faster switching, higher current) and could result in the increase you are observing.

    A part in an unconfigured state still executes code from the flash when it powers up. This is a bunch of NOPs (effectively) for an erased part.

    Does the current draw go down when you halt the CPU using the debugger connected via the xds100?

    Regards, Sunil