DS1747W-120

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DS1747W-120 is an integrated circuit (IC) from Dallas Semiconductor, which is designated for real-time clock applications. In combination with certain external components, it can provide a digital or analog output, thus it is suitable for building various timing devices such as alarm clocks, timers, calendar clocks, and etc. In this article, we will discuss how it works and explain its application field.

Working Principle

DS1747W-120 contains an oscillator, a voltage regulator, and a hazard protection circuit. For oscillator, it uses an advanced CMOS RC oscillator to provide a stable and long-term timebase for the clock. The oscillator runs at 32.768 kHz, no matter if it is powered by battery or other permanent power sources, thus it is very accurate. On the other hand, for voltage regulator, it uses a low-dropout linear regulator to ensure the oscillator can have a constant operating frequency even if the input voltage changes. It is also equipped with a powerful Hazard Protection circuit, which can clamp the voltage ripple at supply rails and protect the system from hazards such as over-current, voltages surges, and transients.

Additionally, DS1747W-120 also integrates a 16-bit counter and a programmable digital-to-analog converter (DAC). The counter is generally used to count the elapsed time and the DAC provides an analog output, which can be adjusted according to the users’ needs. In general, the DAC output is usually between 0.25V to 4.95V, thus it can be easily connected to any voltage-controlled electronic devices.

Application Field

The DS1747W-120 has several practical applications in the field of timing and clock synchronization. For example, it can provide accurate time stamping and synchronization for security systems, CCTV systems, and wireless networks. Furthermore, it is also used to create accurate timekeeping systems for manufacturing processes, medical equipment, and industrial robots. For alarm clocks, it is particularly suitable for those that require multiple alarms and multiple wake-up modes.

Apart from that, the integrated DAC and Hazard Protection circuit make it ideal for projects with many analog timing and control requirements. With the DAC, it is possible to generate “low-voltage” pulse width modulation (PWM) signals, which can be used to control various motors and DC pumps. Meanwhile, with the Hazard Protection circuit, it is possible to integrate it with high-voltage devices without risking damage to the IC.

Conclusion

To summarize, DS1747W-120 is an integrated circuit from Dallas Semiconductor for building timing devices. It is equipped with an oscillator, voltage regulator, and hazard protection circuit, as well as a 16-bit counter and a DAC. It is especially suitable for alarm clocks, security systems, CCTV systems, industrial and medical equipment, and so on. Thus, it is a very useful and versatile IC for various real-time clock applications.

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