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AM620-Q1: The Definition of Power Of Hour For Automotive Grade

Gibbs Shih
Expert 5275 points
Part Number: AM620-Q1

Tool/software:

Hi, Dear Expert

I have similar problem with this thread, so I post the problem for double checking.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1061732/tda4vm-tda4vm-power-on-hour-poh-limits

Q1/A1 : Is junction temperature same as "die temperature"?

Can we measure it by internal temperature sensor  (HotSpots) in SoC? 

Q2/A2: What's the definition for time/temp ?(5%@-40°C, 65%@70°C, 20%@110°C,and 10%@125°C.)

Does it mean test duration as below,

5%@-40°C = 20K hours * 5% at -40°C

65%@70°C = 20K hours * 65% at 70°C

... and so on.

Q3/A3 : time/temp(%) can be any  combination between -40°C ~ 125°C  under 20K POH isn't?

Thank You.

Gibbs

  • 0
    TI__Guru**** 190519 points

    Hello Gibbs,

    Thank you for the query.

    I am assigning the query to the device expert to support.

    Regards,

    Sreenivasa

  • 0 in reply to Kallikuppa Sreenivasa
    TI__Guru 62895 points

    1. Yes, junction temperature is the same as die temperature. The AM62x device has an on-die temperature sensor that has an accuracy of +/-5 degrees Celsius from -40 degrees Celsius to 125 degrees Celsius. The next revision of the AM62x datasheet will have a new section titled "Temperature Sensor Characteristics" that defines these characteristics.

    2. and 3. The Automotive certified device can be operated with a junction temperature up to 125 degrees Celsius. However, the 20000 power on hour value is only valid when the device spends less than 5% of its time operating at -40 degrees Celsius, less than 65% of its time operating at 70 degrees Celsius, less than 20% if its time operating at 110 degrees Celsius, and less than 10% if its time operating at 125 degrees Celsius. The 20000 POH is not valid if any of these operating conditions are exceeded.

    Regards,
    Paul 

  • 0 in reply to peaves
    Intellectual 420 points

    hi  peaves"

                  In the 20,000 hours tested, AM62 ran at 125 degrees Celsius 10% of the time, whether it was running continuously at 125 degrees Celsius or at 125 degrees Celsius for a period of time, and running at other temperatures for a while

  • 0 in reply to xiao-an lei
    TI__Guru 62895 points

    The operating profile is not based on any test. It represents the operating profile assumptions that were applied to simulation models used to check long-term device reliability.

    Regards,
    Paul