Interface:	Parallel
Base Part Number:	DS1685
Supplier Device Package:	24-TSSOP
Package / Case:	24-TSSOP (0.173", 4.40mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C
Current - Timekeeping (Max):	3mA @ 5V
Voltage - Supply, Battery:	2.5 V ~ 3.7 V
Voltage - Supply:	4.5 V ~ 5.5 V
Series:	--
Date Format:	YY-MM-DD-dd
Time Format:	HH:MM:SS (12/24 hr)
Memory Size:	242B
Features:	Alarm, NVSRAM, Square Wave Output, Y2K
Type:	Clock/Calendar
Part Status:	Active
Packaging:	Tube

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DS1685E-5+ Application Field and Working Principle

Introduction

The DS1685E-5+ is a Real-Time Clock (RTC) that delivers accurate timekeeping and long-term timekeeping performance in a low-power, space-saving TSSOP package. This family of RTCs has multiple features and clocks, including UTC hour and second alarms, a temperature output, leap year compensation, and pulsed square wave output. The integrated voltage regulator provides a stable 5V supply, allowing wider temperature range and higher accuracy in a wide variety of applications.

Features

* Low power CMOS RTC* Fully integrated 512-byte battery backed memory* Sixteen 32 bit registers with calendar and alarm capabilities* High accuracy of less than 1ppm (0.01%)* Integrated voltage regulator* Easy communication interface* Leap year compensation* Temperature output* UTC time second and hour alarm* Pulsed square wave output

Application Fields

The DS1685E-5+ is a versatile device that can be used in a variety of applications. These applications can be found for industrial, consumer, and automotive applications. Examples include:* Automotive – The DS1685E-5+ can be used in automotive applications such as controlling power windows, sunroof, and interior lighting.* Industrial – The DS1685E-5+ can be used in industrial applications, such as controlling motors, HVAC systems, and monitoring processes.* Environment Control – The DS1685E-5+ can be used in environmental systems, such as thermostats and security systems.* Consumer – The DS1685E-5+ can be used in consumer applications, such as timers, alarms, and clocks.

Working Principle

The DS1685E-5+ is driven by a crystal oscillator that provides high accuracy with little drift. The device has a 512-byte SRAM battery-backed memory that stores Calendar and Alarm registers, multiple alarms, a temperature register, and a set of user-programmable registers. The device also has a temperature output and an RTC drive signal which provides a pulsed square wave output.In order to keep the device synchronized to an absolute time standard, the DS1685E-5+ provides an algorithm for calculating leap years and calculates UTC time continuously. The device also supports backup power supplies for both the main crystal oscillator and the battery backed memory.

Conclusion

The DS1685E-5+ is a powerful and versatile real-time clock that is suitable for a variety of applications. The device provides accurate timekeeping performance with low power consumption and a number of features including UTC time second and hour alarms, leap year compensation, and a temperature output. The integrated voltage regulator provides a stable 5V supply, allowing the device to be used in a wider variety of applications.

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