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CCS/UCD3138: About Reset conditions

user5296461
Intellectual 360 points
Part Number: UCD3138

Tool/software: Code Composer Studio

We downloaded and use the PSFB program of this URL(www.ti.com/tool/ucd3138fw-psfb ).

 

In the normal operation (regulate_state), what is considered as a cause of PWM gate signal going off and self-resetting?

It is approximately 125 ms from gate off to on.

 

If we do not include high temperature anomalies, we think that we have not gone to Fault_State because the time from off to rise is short.

 

We think this behavior will occur under the following conditions.

 

/ RESET worked

WatchDog worked

 

I would like to know other conditions.

 

best regards,

  • 0
    TI__Genius 17090 points
    I suspect that noise is causing the UCD to reset. We have layout guidelines for correct layout here:

    www.ti.com/.../SLUA779

    To tell if it is a reset, load the program into flash without programming the checksum. That way, instead of restarting, it will stay in ROM mode.

    It might be possible that it is a low input voltage fault. That will cause the UCD to restart quickly. For example if there is a glitch that causes the ADC to see one low voltage signal on Vin. All the other faults look like they have a 1 second hiccup, or they latch off.

    If you have modified the program, it is always possible to have something like a pointer which runs wild and accesses illegal memory - that will also cause a reset.

    Our EVMs are susceptible to noise, especially at high load or at high transients. Their layout doesn't always follow the latest guidelines either.