DS1251W-120

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Clock/Timing – Real Time Clocks

DS1251W-120 is a “Real Time” (RTC) clock designed for applications that require accurate time and date information. The clock has a combination of advanced features, such as an enhanced menu of functions, an external battery backup supply and an up to 12-hour clock accuracy at 25°C. This particular device provides an easy to use 32-bit microcontroller based on the well-respected and reliable StrongARM processor architecture.

Application Field

The DS1251W-120 is designed for a variety of applications and can be used for industrial, residential, and commercial applications including time tracking, alarm systems, and timing devices. It is ideal for use in a variety of applications, from time keeping to monitoring and secure communications equipment.

DS1251W-120 RTCs can be used in any application requiring accurate clock/timer operations such as industrial automation, residential/commercial applications, and secure communications equipment. Its use in such applications provides a tight integration of time-critical tasks sealed in accurate sound capably.

The RTC can also be used in automobile industry, retail and hospitality services, smart home environments and many other applications, providing reliable timing and data management.

Working Principle

The DS1251W-120 uses a standard RTC ticking rate at 1 Hz with an accuracy of ±4.68 seconds per day, or ±11.20 minutes per month. It also has a very accurate 32 kHz frequency driven by a scaled-down temperature-dependent RC oscillator over the operating temperature range.

The device employs a modified binary-coded decimal (BCD) format, which provides for up to four years of date data. This format allows for up to 12 hour clock accuracy at 25°C, and also allows for single address accesses of the RTC counter values. The RTC also features an external battery backup supply input that allows the clock to continue to run even when the system power is removed, ensuring the clock will not lose its time setting.

The device includes an internal temperature-controlled oscillator (TCXO) to supplement the external clock signal. The temperature-compensated oscillator operates in the temperature range of 0 to 70°C. This allows the clock to maintain a reliable and high accuracy over the entire operating temperature range. Additionally, the RTC supports a wide range of oscillator frequencies and can be used for systems running at 5, 10 or 15MHz.

In addition, the DS1251W-120 clocks have an automatic time-zone adjust feature that allows the time to be automatically adjusted depending on the time zone in which the system is located. This feature allows users to use the device in any part of the world without having to manually adjust the time.

Conclusion

The DS1251W-120 is an ideal Real Time Clock for Accurate Time and Date Information for various applications such as time tracking, alarm systems, applications need accurate clock and timer operations, communication equipment, smart home, automotive and many more.

The device has advanced features such as an external battery back up supply, temperature-controlled oscillator and time-zone adjust, allowing the device to work in any part of the world with steady accuracy.

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