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Using PWRGOOD signal to reset the DLPC900

nathan klein
Intellectual 345 points
Other Parts Discussed in Thread: DLPC900

Hi,

We would like to use PWRGOOD signal in order to reset the DLPC900 , is there a minimum time the signal should be LOW in order for the reset to happen?

is there a mechanism to protect against signal spikes ?

Thanks,

Nathan.

  • 0
    TI__Mastermind 43125 points

    Hello Nathan,

    We are looking into this.  We believe that it is acceptable, but want to give you correct information.

    Fizix

  • 0
    TI__Mastermind 43125 points

    Hello Nathan,

    Based on the information in the DLPC900 data sheet [ http://www.ti.com/lit/gpn/dlpc900 ] on page 29, this is not a recommended mode of resetting the controller.  On the EVM there is no mechanism to protect against "signal" spikes.  We assume you mean spikes in the power input.  A good DC power supply should filter such spikes out.

    I hope this helps.

    Fizix

  • 0 in reply to Fizix
    Intellectual 345 points

    Hi Fizix,

    Thanks for the reply, just one more question, how would you recommend doing hardware reset ? the spikes I am talking about are on the signal itself but not due to power supply noise but external noise (EMC ...).

    Thanks,

    Nathan.

  • 0 in reply to nathan klein
    TI__Mastermind 43125 points

    Nathan,

    Sorry for the delay.  We are still looking at this to determine a recommendation.

    Fizix

  • 0 in reply to Fizix
    TI__Mastermind 43125 points

    Hello again Nathan,

    I have talked further with the team that designed the EVM.  The lead engineer indicates that it is possible to use PWRGOOD provided you send a StandBy command to the system and wait the time prescribed in the controller data sheet before you take PWRGOOD low.  You must then also wait the prescribed time after taking PWRGOOD low to allow the micromirrors to finish parking before reasserting PWRGOOD.

    This will be equivalent to removing power and the system will go through a full initialization again.

    Fizix