AN893| Application Note
Maxim/Dallas > App Notes > MICROPROCESSOR SUPERVISOR CIRCUITS Keywords: switch debouncer, timer period, sleep mode, switch debounce IC, integrated circuits
Apr 12, 2002
APPLICATION NOTE 893
Switch-Debouncer IC Creates A Long-Period Timer
This application depicts how to reduce power in systems that only require the uP to be used periodically. By using a debounce IC circuit, the uP can be set to monitor over long timer periods, thus allowing it to enter lowpower mode for the remaining time. As a result, overall power is reduced. One major application for long-period timers is in remote weather-data stations. These stations measure environmental conditions at regular time intervals and transmit the results to a central collecting facility. Since these small weather stations are often located in remote areas that depend on solar-cell power during cloudy weather, power efficiency is an important factor in their design. Size and cost are also prominent considerations. A minimum-component configuration is possible for an all-surface-mount, low-power, long-period timer. This design can be implemented with two low-cost components and firmware that reduces power consumption by allowing the microcontroller (uC) to enter a "sleep mode." Later, the uC is
awakened to perform regulary scheduled measurements. The circuit shown in Figure 1 accomplishes this task by taking advantage of the extra section in a dual CMOS switch debouncer (U1).
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