DS1682S

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Real-time clocks (RTCs) are low power clocks that keep the time even in the absence of a main power source. The reliable signal of an RTC allows for greater accuracy in controlling computers, smart devices, and industrial processes. DS1682S is a battery-backed, serial real-time clock (RTC) that provides year, calendar, and 12 or 24 hour timekeeping with millisecond multiplexed output. This device offers user programmable alarms and an internal 32.768 kHz oscillator that can be externally tuned.

DS1682S Overview

The DS1682S is a low-cost serial real-time clock available in three-wire (UART compatible) or four-wire SPI compatible formats. It provides year, date, hours, minutes, seconds, and milliseconds as an output. This RTC also has a user-programmable alarm, 32.768 kHz oscillator that can be tuned externally and battery backup for power-fail protection. Power for the clock is provided by a battery or through a 5V or 3V supply.

Features of the DS1682S

• Provides Date and Time information
• 3-wire UART/4-wire SPI Compatible serial interface
• Up to 1ms resolution of output
• Programmable Alarm Functions
• Individual control of each MSB
• User-programmable 32.768 kHz Oscillator
• Battery Backup and Power Fail Detection
• Two external interrupts
• 5V or 3V Supply Options

Applications

The DS1682S is a low-cost, battery-backed real-time clock with integrated alarm features, making it an ideal solution for a number of applications. The DS1682S is typically used in consumer electronics and industrial systems that require timing information and needs to run without the benefit of an external power supply, such as:

• Smart Appliances
• Medical Devices
• Point of Sale Systems
• Security & Access Control Systems
• Vehicle Tracking
• Home Automation
• Building Automation
• Manufacturing Processes

Working Principle

DS1682S is a low-cost serial real-time clock available in three-wire (UART compatible) or four-wire (SPI compatible) formats. This RTC has a built-in alarm function, battery backup for power-fail protection, and an internal 32.768 kHz oscillator that can be externally tuned. The DS1682S works by combining the output of the oscillator with a set of multiplying dividers connected to a 12 or 24 hour time keeping circuit. This provides year, month, and date information, along with the hours, minutes, seconds, and milliseconds as an output. When a programmed interval is reached, the RTC triggers an interrupt. The timekeeping circuit and oscillator are controlled by the same logic circuitry that is used to generate the output signals. This makes the device capable of supporting millisecond resolution output.

The DS1682S is designed to be used with a 3V lithium battery, while the maximum power supply range extends up to 5V. The user programmable alarm feature is provided by a soft-mask register which can be programmed to trigger the alarm at any given time. Additionally, the DS1682S has two external interrupts that can be used to trigger events. The five programmable bits offer further flexibility by allowing the user to control the most significant bit (MSB) of each register.

Conclusion

The DS1682S is a low cost real-time clock ideal for a number of applications that require timing information and need to run without external power. This device offers millisecond resolution output, a user-programmable alarm, 32.768 kHz oscillator that can be tuned externally, and battery-backup for power-fail protection. Additionally, the five programmable bits allow the user to control the most significant bit (MSB) of each register. The DS1682S is an optimal choice for applications that require low power, reliable time-keeping in the absence of a main power source.

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