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Where are the I2C pins on the TMS570LS3137?

Marlin Arnall
Prodigy 20 points
Other Parts Discussed in Thread: TMS570LS3137

Hello

I am trying to get the I2C communication working but I am unable to find the pins on the board. In the Datasheet for the TMS570LS3137, under the section "ZWT Inter-Integrated Circuit Interface Module", it is labeled as:

MIBSPI3NCS[2]/I2C_SDA/N2HET1[27]    -   I2C serial data or GPIO

MIBSPI3NCS[3]/I2C_SCL/N2HET1[29]    -    I2C serial clock or GPIO

But I can't find anything close to this on the physical board.

Martin

  • 0
    TI__Guru 68920 points

    Martin,

    Do you have the schematic for the board you're using?  Normally you would just trace from the ball or pin # to some place on your board schematic.  Are you using one of the HDKs?  If so these schematics are available in the HDK product folder.  Or you could look for one of the other names like MibSPI3NCS[3] or N2HET1[29]... on the HDK board schematics there isn't room to put the whole long name w. all the functions.

    -Anthony

  • 0 in reply to Anthony F. Seely
    Prodigy 20 points

    Hello Anthony, thank you for your reply

    Yes, I am using one of the HDK boards. Unfortunately any pin label matches that I can find are off by one letter. There is an MibSPI3CS[3] (not MibSPI3NCS[3] as it is on the other data sheet) and there is a number of NHET1[29]'s but no N2HET1[29].

    Do you know if they are interchangeable in this case?

    Thanks,

    Martin

  • 0 in reply to Marlin Arnall
    TI__Guru 68920 points

    Hi Martin,

    Yes, you'll have to ignore these and write them off as 'abbreviations' due to limited space.  At least I can tell you the font got really small before those abbreviatons were made :) -  Those are the pins you want.

    You may still want to check the schematic for the HDK.  Some pins go through 'switches' controlled by S2, and if the position of S2 is wrong you won't see the pin wiggle on the HDK connector because it's routed somewhere else.  I don't think in this case you will have that problem since these I2C pins are not multiplexed with USB or Ethernet which is mainly what S2 is for.  But in the future if you are sure you're wiggling a pin and if you think you are probing the right pin on the HDK's connectors but don't see what you expect - the settings of S2 are the next thing to check.

    Best Regards,

    Anthony