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MSP430F5529: Hardware Reset Problem

Andy Delle
Prodigy 230 points

Part Number: MSP430F5529

Tool/software:

I have successfully completed a prototype using the TI MSP430F5529 LaunchPad.

But before an initial PCB run I wanted to prototype the hardware exactly as will be implemented in the final design. 

As the LaunchPad has additional hardware, I wanted to be sure none of this is needed or influencing my final design.

So I built a new breadboard as pictured below. 

However I now have intermittent startup problems. I have read in the TI hardware guide that the RST pin is sensitive to stray capacitance. I am using the recommended 47K / 1000pf reset components with the Biwire programming interface.

Looking at my test board, do you experts think that is the problem here due to the excessive IC pin lead length? If so, I think I can ignore it as the final design is a tight layout?

  • 0
    TI__Mastermind 22787 points

    Hi, Andy

    Andy Delle said:
    However I now have intermittent startup problems.

    Do you mean that MSP430 will automatically reset during running?

    Andy Delle said:
    do you experts think that is the problem here due to the excessive IC pin lead length?

    It's depending on your test environment.

    Such as powering stability, High-power signals on nearby wires.

    If possible, you can use a oscilloscope to observe the Reset pin with a GPIO toggle at MSP430 init stage.

    To see, whether the random negative pules signal on reset pin cause the device reset during running.

    Regards,

    Helic

  • 0
    Guru 34813 points
    Andy Delle said:
    However I now have intermittent startup problems.

    What? If USB and external XT is not used, this setup should work. If you have problems during SBW debugging than use shorter (as possible) SBW lines on lowest clock.

  • +1 in reply to zrno soli
    Prodigy 230 points

    FOUND THE PROBLEM

    PUR was left floating. I added a 1meg resistor to ground as on the LaunchPad and now everything is good.

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