DS1685SN-3

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Despite the continuous evolution of technology, time management is still a challenge in many application fields. This is especially true for the development of electronic devices. This is why the use of a secure, reliable and accurate timing reference is essential for modern processors and controllers. The DS1685SN-3 from Maxim Integrated is such a timing device offering reliable timekeeping for real-time tasks. This article provides an overview of the application fields of the DS1685SN-3 and its inner working principle.

The DS1685SN-3 is a real-time clock optimized for low-power applications. It combines a compatible PCF8563 Real Time Clock/Calendar (RTC) with an integrated timer and a PIN-programmable selectable power supply voltage between 1.6 and 5.5V. The device is ideal for battery-powered products, due to its small foot-print and low power consumption. In order to minimize power consumption, the DS1685SN-3 actively shutdowns parts of the device when clock and calendar information do not need to be tracked. In addition, the device has a backup supervisor to detect and signal when power fails, extended read and write capability and a programmable alarm.

The DS1685SN-3 is designed for systems that depend on a secure and reliable timekeeping functionality and is readily compatible with Maxim’s Static Logic for reset and watchdog operation. This makes the DS1685SN-3 an ideal choice for applications such as home appliances, healthcare, automotive and industrial control, portable consumer and communications products.

The core of the DS1685SN-3 is its oscillator, whose stability serves as the basis for high accuracy timestamps. The oscillator uses a valved quartz crystal resonator technology to reduce temperature variability. The system clock rate is 32.768 kHz and a crystal suitable for 10 ppm accuracy. For high temperature environments, the DS1685SN-3 offers an optional ESD crystal package.

In terms of functionality, the DS1685SN-3 includes the PCF8563 RTC, an 8-byte battery-backed static RAM (SRAM), an integrated timer and a programmable alarm. The PCF8563 RTC module, programmed by the user, reports time and date information in ANSI C time format, and can be controlled through an I2C bus or via an I/O bus interface. The integrated timer allows for power-fail/wake-up functions, programmable timer/counter for real-time events, and operation of the device without the need for an I2C bus.

The integrated programmable alarm can be used to generate digital interrupts and can take periodic measurement of environmental conditions, such as temperature and humidity. Additionally, the SRAM module can be used to capture data, such as program routine execution inputs, enabling further evaluation and analysis of logged data points. This SRAM is self clocking, allowing the user to select an appropriate read/write duty cycle.

The DS1685SN-3 device has also up to 7 autonomous software components to support the hardware-based clock and calendar functions; the power-fail/wake-up timer and the programmable RTC alarm. This provides a real-time clock advantage, in that the user can program the system to wake up at certain times and times and on certain alarms, enabling real-time scheduling for energy efficient systems.

In conclusion, the DS1685SN-3 is an ideal clock/timing device for applications needing a secure and reliable timing reference, avoiding the development of custom components for such an application. With its low-power consumption and extended capability, it is the preferred choice for low-power applications requiring secure timekeeping. Its integrated timer and alarm clock make it suitable for a variety of time management tasks, giving the user confidence in the clock accuracy and reliability.

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