Smarter wake up timer from Linear Tech

You want a timer IC which wakes up a device or system with wake up period range of 250 milli seconds to 39 days. Well there are plenty of 555 timer circuits and 8 bit microcontroller based RTC based chips but the problem with 555 timer is power consumption, lot of external components and also range of control. Where as the problem with microcontroller circuit is you need to write a code and also consume more power . The new wake-up timer with pushbutton control IC LTC2956 from Linear Technology operating from 1.5V to 36V while “sleeping” consumes only 800nA of quiescent current from a battery or rail. LTC2956 ca be used to perform routine tasks, such as monitoring human body temperature, monitoring strain in a bridge, or capturing images, benefit from adjustable timing options without the need to program devices or upgrade firmware. The LTC2956 periodically “wakes up” and turns on a system to perform these tasks, then turns the system off to conserve power. The wake-up period is resistor-adjustable from 250ms to 39 days, requires no code, and enables users to easily set device countdown timers via jumpers or switches. LTC2956 are ideal for single-cell, multicell and high voltage devices, including intervalometers, which are used in time-lapse photography or military countermeasure applications, as well as “heartbeat” timers. A ±25kV ESD protected pushbutton inpu...