DS1391U-3+

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The DS1391U-3+ is an ultra-low-power, real-time clock (RTC) that monitors seconds, minutes, hours, day, date, month, and year information based on a 32.768kHz output from a quartz crystal. The device also includes an industry-standard I2C-based Serial Interface and a variety of output and input functions, providing a great solution for tracking the time, no matter what application. Herein, we will discuss the application fields and working principles of this device.

Application Fields

The DS1391U-3+ is designed to accurately track and display time in a range of applications. It is commonly used in computers and servers, personal desktop and laptop systems, PDAs, embedded systems and embedded controllers, automotive control systems, home-automation and building-automation systems, security systems, and so on. Additionally, the DS1391U-3+ boasts an extremely low-power consumption, and offers the ability to back-up information with a battery backup.

Working Principle

The DS1391U-3+ is based on a quartz crystal oscillator, featuring a 32.768 kHz output. This crystal is used to set the clock’s counter and to control the accuracy of the oscillator. This output is then sent to a CMOS oscillator circuit, made up of resistors and capacitors. The CMOS oscillator circuit is clocked at 32.768 kHz and the signal is sent to a prescaler circuit, which divides the signal by 65,536 to generate a frequency of 1 Hz (one pulse per second). This signal is then further divided by counters to generate signals for the minutes, hours, days, etc., and finally output to either an on-chip or external LCD display.

The DS1391U-3+ then processes the output of the quartz crystal to calculate the time and date, according to the day of the year or the day of the week. This data can then be stored in a user-configurable section of memory, which will maintain the time and date even when power is removed from the chip. Additionally, this device includes an I2C-based serial interface that allows users to access the clock and retrieve time and date information as well as set up and configure the device.

Conclusion

In conclusion, the DS1391U-3+ is an ultra-low-power, real-time clock that can be used in a wide range of applications to accurately track and display time. It is based on a quartz crystal oscillator and its output is used to generate signals for the minutes, hours, days, etc. Additionally, its I2C-based serial interface enables users to access the time and date information as well as to configure the device. All these factors make the DS1391U-3+ a great solution for tracking time in any application.

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