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OMAP4430 Power On Hour Limits

Zach
Prodigy 195 points

Other Parts Discussed in Thread: 4460, 4430

I have an OMAP4430 in a design for a device and need to understand the lifetime of the part.  Table 3-4 lists Power On Hour Limits for the device, with the vast majority of the time being in a retention state, presumably analogous to a smart phone in standby.  Note 1 on the table indicates that TI should be contacted for use cases different than this.

Our device may have the display running the majority, or conservatively all of the time, and need to understand how this may impact lifetime of the part.  Will this part be able to support continually running a display, and if so does it change the 5 year life time?

I have also considered transitioning to the 4460 or 4470, would this impact the part's life time?  This may be an option but it seams the parts are not pin compatible so staying with the 4430 is preferable.

  • 0
    TI__Genius 10965 points

    Using the table below is possible to calculate the average time that the chip could sustain in the desired state.

    What is your exact application that you are considering for a long time run?

    Regards,

    Boyko

  • 0 in reply to Boyko Kazakov
    Prodigy 195 points

    Thanks Boyko, I did see that example in table 3-4 of the data sheet, but it was unclear how to apply it to different use cases, and also note 1 indicates TI would need to evaluate other use cases to determine if they can be supported.

    I'm not 100% sure of the final use case, but I am sure we will have the display running the majority of the time. If for example the last entry of the table labeled "RETENTION" actually required processor frequencies of the line above (98/133/200 MHz) how could we determine the Power On Hour Limit for that line? Would it still be 31945 hours or would it be reduced? Are there documents or formulas we can refer to to determine the POH limit based on our application?

    Also, does duty cycle matter? For example, in the use case described in Table 3-4 is the 5 year life of the part applicable if you operate at the OPPNT voltage level causing a Tj of 93C for a full 2641 hours straight and then reduce voltage or would you need to operate at that level for a shorter period and then reduce the voltage to a lower level to allow cool down?