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LM3710: LM3710 Watchdog timer 25.6S

Johnsin Tao
Intellectual 1625 points
Part Number: LM3710
Other Parts Discussed in Thread: TPS3851

Hi engineers:

     What is the difference  of the versions of of LM3710 ,   LM3710XKMM-463,  LM3710XQMM-308/NOPB,  LM3710YQMM-232/NOPB.

     How is get the  Watchdog timer 25.6S by LM3710 ?

     Thank you!

  • 0
    TI__Mastermind 35895 points

    Hi Johnsin,

    If you decided to order LM3710XQMM-308/NOPB, the part specs are:

    "X" - Totem-pole (push-pull output configuration)

    "Q" - 200ms Reset TImeout Period / 1600ms Watchdog Timeout Period

    '308' - Threshold Voltage (3.08V).

    If you decide to order LM3710YQMM-232/NOPB, the part specs are:

    "Y" - Open-Drain output

    "Q" - 200ms Reset TImeout Period / 1600ms Watchdog Timeout Period

    '232' - Threshold Voltage (2.32V).

    I hope this answers your question.

    Ben

  • 0 in reply to Ben C
    TI__Mastermind 35895 points

    Hi Johnsin,

    Here is additional information for you.  Below are the codes of reset and watch dog timers found in the electrical characteristic section and as follows:

    Only the devices listed in the packaging information, package option addendum found on page 1, are available for ordering.

    Currently those are: LM3710XKMM-463/NOPB, LM3710XQMM-308/NOPB, LM3710XQMMX-308/NOPB, LM3710YQMM-232/NOPB

    The devices with codes S, T, U or V, which would give 25.6sec nominal WDT, are no longer available. Please consider TPS3851 if such long watch dog timeout period is needed. With an external capacitor watch dog timeout period up to 77sec are possible.

    Please let me know if you have any additional questions.

    Ben