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Original question:

TMS320F28379D: Where is the X1/X2 pin on C2000 LaunchPad TMS320F28379D？

LMK61E2EVM: How to reset LMK61E2EVM?

LeoLeoHu
Prodigy 110 points

Part Number: LMK61E2EVM
Other Parts Discussed in Thread: CODELOADER

Last night, after choosing some parameters in the Code Loader 4 and clicking Program EEPROM, the corresponding signals showed up on my oscilloscope,

which means the LMK61E2EVM works fine, I think.

But this morning, no signal showed up on the oscilloscope after clicking Program EEPROM.

And, when I clicked the Find I2C Address and Generate Configuration, the orange LED blinked as usual. And I2C address can be scanned successfully.

Emmm, I believe some misoperation of mine causes this.

So my questions are:

How to judge whether my LMK61E2EVM is broken down?

And is there any way to RESET it?

  • 0
    TI__Genius 16845 points
    Hello,

    One quick thing that you can check is to check the J5 header and make sure that OE is pulled to VDD in order to enable the output.

    Another thing to check is the output format. The default EVM has 150-ohm to ground terminations on OUTP/N to properly terminate for LVPECL signaling. If you need an LVDS output, make sure that you populate 0-ohm resistors for R27 ad R30. The proper termination for HCSL is to replace R26 and R29 with 50-ohm resistors.

    It is possible that you are facing some software issues with CodeLoader. Instead of CodeLoader, I recommend to use either the TICS Pro GUI or the LMK61xx Oscillator Programming Tool to program the device. These are newer software tools that were developed for evaluation clocking EVMs; I would typically use either of these tools to program LMK61E2EVM, and not CodeLoader.

    LMK61xx Oscillator Programming Tool: www.ti.com/.../snac074
    TICS Pro: www.ti.com/.../TICSPRO-SW

    Kind regards,
    Lane
  • 0 in reply to Lane Boyd
    Prodigy 110 points

    Hello, Lane:

    Thanks for your help. But it still doesn't work.

    I rechecked the jumper connection. Actually, nobody ever changed the jumper connection since the last time it worked fine.

    And I'm not clear about the resistors you mentioned, I guess you are not suggesting me desoldering R27 and R30 and replacing them with other resistors?

    And I have also tried the software you mentioned.

    In the LMK61xx Oscillator Programming Tool, it shows me the information

    "Device found at 0x7e",

    "Address will be updated",

    "Wrote Register R0x1E as 0x1E00",

    ...

    "Done Updating Frequency Plan",

    "Writing all registers"

    "Done writing all registers, about to commit registers to EEPROM",

    ...

    "EEPROM Programmed",

    after clicking "Find I2C Address", "Generate Configuration" and "Program EEPROM".

    But there is still no corresponding signal out.

    So is it broken, and how to fix my LMK61E2EVM?

    Thank you. Please help me.

  • 0 in reply to LeoLeoHu
    TI__Mastermind 28031 points
    LeoLeoHu,

    Is there some other check you can do other than just looking for a signal out? For instance, if the output enable is set to low, there is no output, but the PLL is locked. I'm not sure if there is a lock detect light on this, but it might be useful. Also, is there some way to check the current consumption to see if this is within expectations (i.e. device or output not powered down)?

    Regards,
    Dean