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Intepretation of Power On Hours for DM3730

Eli az
Intellectual 720 points
Other Parts Discussed in Thread: DM3730

Hi,

I'm looking at table 3.3 in the DM3730's datasheet and I'm having trouble understanding the data.

1 ) What does the total device lifetime column represnt? to what conditions does it refer?

2)  Is the total life time column for OPP100 and sleep?

3) how do I actually use the table, do I divide my operating profile into percentages in each mode and make sure that I don't operate more than the amount of time specified? i.e. not more than 45K hours at OPP130?

 

Thanks in advance,

Eli

 

 

  • 0
    TI__Guru 65405 points

    Hi Eli,

    When you are looking at table 3.3 in the DM3730's datasheet you must take into consideration the first column which represents the junction temperature and after most of the value is added POH (power on hours). When the system going to sleep for more then a few minutes the junction temperature decrease to value very closer to the ambient temperature ( << 75 C in the general case). In this case the total device lifetime is longer then 100K hours.

    The lifetime values in the table represents to permanents work for 45K hours which is more the 5 years without any power management, dynamic frequency change and sleeping. Most of the mobile devices very seldom works at these conditions but if your device will work in such conditions you should think about some heat slick during devices designing.

    BR

    Tsvetolin Shulev

  • 0 in reply to Cvetolin Shulev-XID
    Intellectual 720 points

    Hi,

    Thank you for your answer.

    what I still don't understand is the total device lifetime column, it doesn't specify a mode, does it refer to the OPP100 and standby modes? (assuming standby at ambient temperature of the first column so that the temperature stays true).

    assuming junction temperature of 90degrees for both scenarios, which of the following is true:

    1) I can operate my device at OPP1G for 25K + OPP130 for 45K + 30K (100K-70K I've already "used") for a total of 100K?

    2) I can operate my device at OPP1G for 25K + OPP130 for 45K + OPP100 or standby (90degrees ambient for standby) for 100K?

    Thanks in advance,

    Eli

  • 0 in reply to Eli az
    TI__Guru 65405 points

    Hi Eli,

    The table should be interpreted as - you can operate your device at least at OPP1G for 25K or OPP130 for 45K or (OPP100 or standby) for 100K at 90 degrees Celsius junction (not ambient) temperature. But you should pay attention that at standby the junction temperature decreases to closer to the ambient temperature for a few minutes.

    BR

    Tsvetolin Shulev