AN3283| Application Note
Maxim/Dallas > App Notes > CIRCUIT PROTECTION
MICROPROCESSOR SUPERVISOR CIRCUITS
Keywords: microprocessor, LDO regulator, microprocessor reset
Jul 19, 2004
APPLICATION NOTE 3283
One Button Turns Microprocessor On and Off
Combining a low-dropout (LDO) linear regulator with an OR gate produces a circuit that allows a single pushbutton to turn a microprocessor-based portable system on and off. When placing a microprocessor-based portable device in your desk drawer for weeks or months, you should, of course, turn it off to save battery capacity (unless it requires power to maintain storage of volatile data or to keep a real-time-clock running). To save as much power as possible, it's usually best to turn off the processor, its peripherals, and all power-supply components. A simple circuit (Figure 1) enables a single pushbutton to turn the power off and on. It includes a single OR gate (IC1) and a second device (IC2) that combines a low-dropout linear regulator with microprocessor-reset circuit in a SOT23, QFN, or ultra-chip-scale package.
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