DS1687-5

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Real-time clocks, or RTCs, are devices that track the passage of time and keep track of the day, date, and time. The DS1687-5 is a real-time clock and calendar (RTCC) device manufactured by Dallas Semiconductor Corporation. It is one of the most widely used RTCC devices and is considered to be reliable and high-performing.

The DS1687-5 offers an array of features that make it useful for many different applications. It includes a programmable calendar/alarm capability that can be used to trigger system events at specific dates and times. The device can be programmed to generate interrupt signals at regular intervals, allowing it to be used as a time reference for other system components. It also features RAM, which can be used to store system data and settings.

The DS1687-5 is designed to provide accurate time keeping capability and is suitable for use in applications such as digital data logging systems, multi-sensor networks, and industrial automation systems. Its programmable alarms and interrupt generation make it ideal for use in industrial controllers and embedded systems, as well as for synchronization of data networks.

The DS1687-5 is built with a 32-bit counter that provides a highly accurate time-keeping capability with a resolution of one second. The device is powered by an external battery, which allows the contents of the counter to remain unchanged even when the main power source fails. The device is also equipped with an integrated analog-to-digital converter (ADC), which can be used to measure temperature or other environmental variables.

The DS1687-5 is based on a two-wire serial bus, which enables direct bus communication with the host system for configuration, data retrieval, and status readback. The host system is typically responsible for setting the time, setting the alarms, and reading the date and time from the RTC. The device allows various I/O configurations and can be configured to read an external pulse signal, such as an atomic clock signal, to provide a more accurate time source.

The device includes a self-calibration capability, which ensures high accuracy even under varying temperatures and power supplies. The DS1687-5 also includes a watchdog timer, which can be used to detect system malfunctions and reset the system. The device is open-source, allowing users to customize the code to their specific applications and needs.

The DS1687-5 is a multi-functional RTCC device that is well suited for use in a wide range of applications. Its features and capabilities make it a reliable and high-performing clock/calendar device for industrial, embedded, and data-logging systems.

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