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The LTC2956 is compatible with both passive and active systems. In a passive system, where a microcontroller or FPGA may not be available to manage the LTC2956’s SLEEP pin, the adjustable ONMAX timer determines the awake time, which should obviously be set longer than the maximum expected time the system takes to complete its periodic task. The chart on this slide shows the timing diagram of a passive system using the LTC2956. When the adjustable wake-up time (tPERIOD) is reached, the LTC2956 enters the Awake state and pulls the EN output high to turn on the system. In addition, the wake-up timer restarts and the ONMAX timer (tONMAX) starts running. Once the ONMAX timer expires, the LTC2956 re-enters the Sleep state and pulls the EN output low.
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