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DM816x, C6A816x & AM389x Errata: Timers May Lock Up if TCLKIN Pin is Tied High, Even When GPIO Module is Selected

MarcPyne
Mastermind 25055 points

DM816x, C6A816x & AM389x Timers May Lock Up if TCLKIN Pin is Tied High, Even When GPIO Module is Selected

Revisions Affected: 1.1, 1.0

Details: Timers may sometimes lock up if the TCLKIN pin is tied high, even when the GPIO module is selected. If the TCLKIN pin is tied high (is not toggling/does not come to 0), TIMERs may lock up and may not be usable. This happens even if the TCLKIN pin is not selected by the pin control registers. The locks may be seen randomly on power up; i.e., it may be observed that some timers lock up and some do not.

Workaround: The TCLKIN pin must be driven to 0 on the board.

This will be added into the device errata. This Forum post is to inform you in advance of the issue.

  • 0
    Prodigy 190 points

    Marc--if I read this correctly (No guarantee) the EVM board from Spectrum appears to be using this TCLKIN/GPO[3] for the voltage select function but a bias or pullup resistor is not populated so the line looks like it is being pulled low thru a 10K resistor to ground.  Is the case or am I reading the schematic wrong?

     

    If so, it appears the Spectrum EVM is OK here. I just want to make sure as I am using it as a reference design.  Bruce

     

    Thanks Marc for your help

  • 0 in reply to Bruce Kennedy
    TI__Mastermind 25055 points

    Bruce,

    Yes, you are correct. You can follow the example of the EVM, which does pull it to ground.

    Regards,
    Marc