application notes title: em61 wake-up time notes number : ap-EM61-0007E-V1 revision date : 5 september 2002 revision version : 1.0 affected chips : all em61 series chips the em61 series chips wake-up time is wdt time based. as the wdt timer utilizes internal rc mode for oscillation, fl uctuation of the vcc relative to wake-up time is apparent. hence, when vcc is low, wake-up time is longer. this condition is illustrated in the following chart: wake-up time v.s.vcc 0 10 20 30 40 50 60 70 80 90 100 1.522.533.544.555.56 em61002 em61001 when working with em61 series chip at lo w vcc, do take into account the expected change in the length of wake-up time. elan has established that the wake-up time length should be ? 120 ms (max.) at vcc=2.4v. elan guarantees that this wake-up timing specification will be implemented to all future releases of the em61 series chips.
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