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nERROR pin pullup resistor

Mark Squires
Prodigy 10 points
Other Parts Discussed in Thread: TMS570LS3137

Hi,

We are using the TMS570LS3137 for an aerospace application. The nERROR pin drives one input of a two input AND gate (MC74VHC1GT08), the other input is driven by an external reset signal (active low). I have to use a pull up resistor (to 3.3V) on the output of nERROR to ensure it drives the input of the AND gate correctly. Without the pull up the nERROR will not go high , it just stays low.

Is this correct operation i.e., does this pin require a pull up? Also, what type of output is nERROR? Is it a push pull , this is not clear in the data sheet?

Many thanks.

Mark Squires  

  • 0
    TI__Mastermind 49120 points

    Hi Mark,

    nERROR is a push-pull output and is normally driven High. The Error Signaling Module (ESM) drives this pin low to indicate any group2 and group3 error condition. Also, you can configure the ESM to drive this pin low on any group1 error condition.

    When the nERROR pin gets driven low on an error condition the error flag must be cleared and then 0x5 written to the ESMKEY register in order for the nERROR pin to go High after the programmed duration has expired.

    Can you please check if there are any ESM errors in the condition when the pin is held low?

    Regards, Sunil