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IWR1443: Power-on hours (POH) rating

Francois Charlot
Mastermind 28287 points
Part Number: IWR1443
Other Parts Discussed in Thread: AWR1443, IWR1642, AWR1642

Hello,

The IWR1443 datasheet includes a table for the power-on hours rating, but the figures are tbd. The AWR1443 datasheet contains some figures, but I could not make sense of them: they seem to correspond to a temperature profile that adds to 10,000 hours in total when one would expect a longer rating.

For the IWR1443 which is my real concern: do we guarantee 100,000 POH at 105 degC? Something else?

For the AWR1443: could the meaning of the figures in the datasheet be clarified?

Thank you,
François.

  • 0
    TI__Guru 58035 points
    Hello Francois,
    We are checking with the experts on this specific aspect. They would get back to you with the details.

    Regards,
    Vivek
  • 0 in reply to Vivek Dham
    TI__Mastermind 37500 points

    Hello,

    The Power on Hours require a specific assessment of device operation, die temperature, to estimate the expected-lifetime of the device.   These calculations are not yet available for IWR1443 or IWR1642.   The calculation is discussed for TI Embedded Processors in sprabx4.   In Figure 2 Electro-Migration failures are related to device Junction temperature.   The document suggests that with modeling of the electronics power dissipation, the heat extraction, and device power, the Theta temperature parameters, and customer environment can be designed to lower the junction temperature to 105C.  

     

    The AWR1x43(IWR1443) and AWR1642(IWR1642) have the same device functions, same pinout and package.  Using the power estimation spreadsheet, and using the thetaJ heat transfer tables, a  Die temperature is estimated.   For now, you could use the AWR device Power On Hours as an estimate, knowing your Tj, until the IWR device calculations are complete.

     

      Although the industrial processors, are expected to be operated in a less severe environment than automotive.  This document describes the Power On Hours accelerating factor (section 4.1).   Table 5.3 in the AWR1443 datasheet, as a reference.   If this follows the application note section 4.1, 4.2

    Junction temperature Tj

    Acceleration

    factor

    Appnote

    reference

    Datasheet value POH

    Appnote estimate

    POH 

      125C

    .2

    Table 4-1

    900

    900 (*)

      115C

    .4

    Table 4-1

    --

    1800

      105C

    1.0

    Table 4-1

    --

    4500

      95C

    1.79

    Figure 4

    6500

    8100

                          

       (*) point used to extrapolate POH

     

    Regards,

    Joe Quintal

  • 0
    TI__Intellectual 1360 points

    Hi Francois,


    You are absolutely correct that there is significant difference in temperature profiles between automotive and industrial.  The automotive profile has been completed and is available through the datasheet.


    The IWR1443 and IWR1642 POH characterization is on going and we will update the datasheet as soon as it is available.  At the moment, we do not provide specific POH guarantee until characterization is completed.

    Thanks,

    --Artem

  • 0 in reply to Radio-Joe
    TI__Mastermind 28287 points

    Hi Joe,

    Thank you. I believe table 5.3 of the AWR1443 datasheet is incorrect. It does show the same POH ratings as above for temperatures of 125 and 95 degC, but it shows POH ratings at 75 and -40 degC lower than at 95 degC. This should not be. Starting from a POH of 6500 hours at 95 degC and given the acceleration factor of the sprabx4 application report, the POH rating at 75 degC should be 6500 x 6.38 ≈ 41,000 hours and well above at -40 degC.


    Regards,
    François Charlot.

  • 0 in reply to Francois Charlot
    TI__Mastermind 37500 points
    Hello Francois,
    Based on the Electro-migration method of failure with junction temperature, the POH hours should increase at lower ambient temperatures. There will be a difference in the mission profile of automotive and industrial sensors. It is possible to have other failure modes, at lower temperatures.
    As an example, if we propose to sample 1 to 4 Hz for sensor applications, with aggressive software power scaling (ie turning on and off sections of the device) the On-time is reduced in these industrial applications, reducing the device power, which reduces the junction temperature. I have proposed that we need multiple POH tables for industrial applications. This work is not yet completed. It should be in a future IWR1443, IWR1642 datasheet revision.
    Regards,
    Joe Quintal