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OPP1G and SmartReflex

Jose42383
Prodigy 250 points

Hello,

 

I am using the DaVinci Video processor and I want to operate it at in the OPP1G regime. the datasheet says the following:

"

(5) OPP1G is a high performance operating point which has following requirements:

–ABB LDO must be set to FBB (Forward Body Bias) mode when switching to this OPP. It requires having a 1μF capacitor connected to cap_vdd_bb_mpu_iva.

–AVS (Adaptive Voltage Scaling) power technique must be used to achieve optimum operating voltage.

"

I was wandering whether I can use the OPP1G without enabling the SmartReflex feature and insted just set the core voltgae to be a constant 1.38V. To be more exact I want to know what are the ramifications of working this way (since I have done that and for now it works).

It is important for me to note that I don't mind working at a non-optimum operating voltage if the only implication of this is that I waste more power. Are there any others, say in term of shortening the life span of the processor?

 

Thanks in advance,

Nimni.

  • 0
    Prodigy 250 points

    Can someone please respond?

  • 0 in reply to Jose42383
    TI__Guru*** 125430 points

    You need to use smart reflex or you will reduce the device lifetime.  The amount by which the lifetime is reduced will vary from device to device.

  • 0 in reply to Brad Griffis
    Prodigy 250 points

    Hi Brad.

    Thank you so much for your answer.

    Do you happen to have some numbers on the lifetime reduction? I know it vary from device to device, but a general estimation will do..

    If I use lower Junction temperature for the device, will it help me extend the lifetime of the device (while working without smartreflex)? Lets say, If I work in Junction-temp of 65C, without SR, in OPP1G, what will is the expected lifetime?

     

    Thanks again,

    Jose

     

  • 0 in reply to Jose42383
    TI__Guru*** 125430 points

    I'm sorry but I won't be able to provide a concrete answer in terms of power-on hours.  It is a very complex issue to do this analysis.  I don't have the tools to do it myself, and it can take weeks of work to do this sort of thing.

    Voltage and heat are two of the primary factors that will affect the lifetime of the device, so it will surely extend the lifetime if you can reduce heat.  Unfortunately I will not be able to tell you by how much!