DS17285SN-5

Real Time Clocks are used to store the current time as a number, usually encoded as the number of seconds elapsed since midnight on January 1, 1970. The DS17285SN-5 is a low-power, 32-bit real time clock and calendar IC from Dallas Semiconductor. It offers numerous features such as built-in temperature compensation, alarms, accurate timekeeping and multiplexing. This article will discuss the application field and working principle of the DS17285SN-5.

Application Field

The DS17285SN-5 is intended to serve a wide variety of applications, including automotive, industrial, commercial, telecom, home and consumer electronics. It can be used to synchronize events and provide time-stamping for various systems. In automotive applications, the DS17285SN-5 can be used to control engine management activities, manage access control systems and maintain time & date logs. In industrial applications, it can be used to control sensors and actuators, manage time & date stamps and monitor production processes. It can also be used in telecom applications to provide time-stamping for events, manage alarms and reset systems.

The DS17285SN-5 is ideal for real-time clocks, calendar applications and non-volatile memory applications in home and consumer electronics. It can be used to store and recall time & date settings, control refresh rates in LCDs and manage alarms in mobile devices. It is also suitable for medical and life safety applications such as pacemakers, defibrillators and life-support systems, where accurate time-stamping is necessary to monitor and report the progress of vital functions.

Working Principle

The DS17285SN-5 is a hybrid real time clock with a 32-bit binary-coded hexadecimal counter and a 12-bit binary-coded hexadecimal calendar. The clock provides a time resolution of 1 second a day and is capable of automatically correcting for leap years. The time is set using synchronized input signals from an external source, such as a processor, a network or a clock generator. The clock has several outputs, including a variable frequency CPU clock and the PWRFAIL signal, which is activated when the power fails.

The DS17285SN-5 also features an internal oscillator, which provides a base frequency of 32.768 kHz. This oscillator is temperature compensated, which ensures its accuracy over a wide range of temperatures and provides minimal frequency drift. The oscillator can be disabled when in power-saving mode, providing considerable power savings. The clock runs on 3V or less and offers low power consumption of around 1µA in standby mode and between 0.2mA and 3mA in operating mode.

The real time clock also offers several special features. It has two alarms, with each alarm capable of generating an interrupt signal or an output signal. It also offers multiplexing capabilities, which allow it to be used in systems where more than one timekeeping source is required. This can be useful when monitoring events in distributed systems, such as monitoring the speed of various motors in an automated production line.

The DS17285SN-5 is a highly capable real time clock and calendar IC, providing precision timing for a variety of applications. It offers a wide range of features such as alarms, temperature compensation, variable CPU clock and power-saving capabilities. Its multiplexing capabilities make it ideal for applications where multiple timekeeping sources are required.