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May it cause problem?

Hyunkweon Jung
Prodigy 20 points

Hi,

The following picture shows the input power for DSP. The bottom is for 1.2V, center for 3.3V. I believe the noise is induced from BLDC motor which the DSP controls and it looks quite big but very short time less than 400ns.

Generally the system works fine however, sometimes(very rare) the system is halted or reset. So, my question is that the problem is caused by the unstable power or another thing? Some say it is OK because of very short time and others not.

Thanks in advence!!

 

H.K. Jung

 

 

  • 0
    TI__Mastermind 35645 points
    Hi,

    We are working on your request and will get back to you shortly.

    Thanks & regards,
    Sivaraj K
  • 0
    TI__Mastermind 43660 points
    Hyunkweon,

    This noise for less than 400ns might have a potential to disturb the device functionality. So it is recommended to minimize this noise using proper filter components.

    Regards,
    Senthil
  • 0
    TI__Guru* 84110 points
    H.K.,

    Which processor are you using?

    What is the top trace?

    What are the vertical scales for the three signals.

    To expand on what Senthil has said, if any of the supply voltages go outside the specification stated in the Datasheet for your device, for any duration of time, we cannot guarantee proper behavior of the device.

    Unless the vertical scale is very small per division, this picture shows improper power supply behavior and you will expect to have problems some of the time or all of the time.

    400ns is a long time for many of our DSPs.

    Regards,
    RandyP
  • 0 in reply to RandyP
    Prodigy 20 points
    RandyP,

    Answering your question, the processor is 6713 and the top trace is for the input voltage(5.5V) of regulators supply 1.2V, 3.3V respectively. All the vertical scale is 2.0V/div. So, the 3.3V fluctuates between 1.1~6.0V and 1.2V between 0.7~1.8V which is outside the specification.

    Thanks a lot!!

    Regards,
    H.K. Jung
  • 0 in reply to Hyunkweon Jung
    TI__Mastermind 43660 points
    H.K. Jung,

    When you say the voltage fluctuates out of the specification, it would definitely create issues in the system. So please try to minimize it within the limits.

    Regards,
    Senthil