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CC430F5137: CC430F5137 overheating

Ilshat Khasanshin
Prodigy 50 points

Part Number: CC430F5137
Other Parts Discussed in Thread: TPS560200, TPS62172, SIMPLICITI,


I am developing a project based on cc430f5137. This is a wireless network based on Simpliciti. The power supply of the microcontroller cc430f5137 is made from a pulse step-down converter TPS560200. However, some (not all) microcontrollers start to heat up very much and consume more than 300 mA. Activities that I have already done: 1. All "hanging in the air" outputs of the microcontroller tuned to the input with a pull-up to power. 2. I changed the converter (used to be TPS62172), everyone used to heat up, now some. 3. All the settings made by errata SLAZ094X. I measured the oscilloscope output TPS560200, nothing special. I can not understand what's the matter!

  • 0
    TI__Mastermind 49692 points

    Hello,

    A few things.

    Is LCDCAP/R33 used? If not, make sure it's connected to VSS.

    Is the VSS exposed die attach pad on the bottom of the package connected to a solid ground plane?

    Have you followed the recommended configuration for unused port pins described in Section 8.2.8 in the User's Guide? You mentioned that you're configuring the unused outputs to inputs with (assumed internal) pull-ups. This could be the issue. Also, Table 1-3 in the User's Guide has a nice table summarizing the recommended connections for unused pins.

    Another important resource is the PORT17 Guidance for CC430 app note. Specifically, read through Section 4 Causes for Latch-up and Prevention. You may need to add current-limiting 330 Ohm resistors to some used (not unused) connections.

    After following these recommendations and the current consumption doesn't decrease, try isolating the CC430F5137 from all other devices in your system and see if the current consumption drops. If it does, then focus on that interface because it may be causing a latch-up on those pins.

    I hope this helps.

    Regards,

    James

    MSP Customer Applications

  • 0 in reply to James Evans
    Prodigy 50 points


    Much that you wrote, I did not even know. This is already useful. LCDCAP / R33 is hanging in the air, maybe this is the problem. Now I'll try, when the result is, I'll write.

  • 0 in reply to James Evans
    Prodigy 50 points
    It worked, thanks for the help.
  • 0 in reply to Ilshat Khasanshin
    TI__Mastermind 49692 points
    Outstanding. Thanks for letting us know!

    Regards,

    James

    MSP Customer Applications

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