DS1315N-5+

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The DS1315N-5+ is Real Time Clock (RTC) providing timekeeping, timing, and calendar functions. It serves most timekeeping needs and is versatile and highly integrated to simplify your application design. This Real Time Clock uses CMOS technology to provide a low-power, nonvolatile timekeeping device. In this article, we will discuss the application fields and working principles of this Real Time Clock.

Application Field

The DS1315N-5+ Real Time Clock is primarily used in automotive systems, mobile phones, PDAs and cell phones, computers and microprocessor systems, security systems, process controllers, and medical instruments. In automotive systems, the Real Time Clock ensures accuracy and consistency of times and date information that is used for system operation and calibration. In computers and microprocessor systems, it performs low-power timekeeping for real-time operating systems and simplifies the implementation of functionality such as sleep or hibernate modes for laptops, notebooks, and handheld devices. In security systems, the Real Time Clock provides a secure time reference for intruder alarms and helps make verification systems more robust. In process controllers, the Real Time Clock is used to monitor and control operations and in medical instruments, it is used to ensure accurate and timely patient health records.

Features

The DS1315N-5+ features include its calendar clock and periodic interrupt timer with programmable period and duty cycle. The Real Time Clock runs in a precision timekeeping mode up to a frequency of 32.768kHz. It also has an integrated 32-bit counter and two alarm control outputs for controlling an alarm or a wake-up condition. Furthermore, the Real Time Clock holds a 56-bit write cycle register and 256 bytes of user-defined NVRAM. This allows for long-term data storage. Lastly, the Real Time Clock incorporates watch circuitry with an internal lithium battery to maintain timekeeping when no power is applied to the device.

Working Principle

The DS1315N-5+ Real Time Clock is powered by its lithium battery and regulated external power supply. The device works in unison with a clock crystal, frequency reference, and several logic and interface components to control a precision timekeeping function. The clock crystal-driven active oscillator maintains a precision rate. The internal circuitry then converts the frequency output to digital form. This digital form is then used as the basis for all timekeeping operations. The precision timekeeping rate is kept track of by a 32-bit free-running counter (seconds). A 56-bit write cycle register stores the timekeeping data for long-term storage.

In periodic interrupt timer mode, the DS1315N-5+ will generate a continuous or single interrupt at a user-defined period and duty cycle. This mode can be used in automotive applications such as Real Time Clock synchronization for engine control systems and for controlling a sleep or hibernate condition on computer and microprocessor systems. The Real Time Clock will also monitor two expanding alarm outputs and a single alarm control output. The alarm outputs can be used to drive external circuitry or to trigger external events.

In summary, the DS1315N-5+ is a robust and versatile Real Time Clock. It features a precision timekeeping mode, periodic interrupt timer, 32-bit counter, and alarm control outputs. It is mainly used in automotive systems, mobile phones, PDAs and cell phones, computers and microprocessor systems, security systems, process controllers, and medical instruments. The Real Time Clock is powered by its lithium battery and regulated external power supply with a precision clock crystal-driven active oscillator for timekeeping accuracy. With these features, the DS1315N-5+ can provide accurate timekeeping and a variety of control functions.

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