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The LTC2956 is suitable for a wide variety of applications, including devices with heartbeat timers and intervalometers. This figure shows how the LTC2956 is implemented in a photographic intervalometer application. A passive model is assumed, so the SLEEP pin is disabled by tying it to ground, while a 10nF capacitor on the ONMAX pin sets the maximum on time of the intervalometer to 133ms, ample time to snap a photo. Meanwhile, different valued resistors are paralleled on the RANGE pin, each equating to how long the intervalometer must “sleep” for before “waking up” and taking the next photo. Users can then turn a rotary switch on the intervalometer to select the desired period, and press a pushbutton switch (which would be ±25kV ESD-protected) to turn on/off the intervalometer.
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