DS1646-120+

DS1646-120+ application field and working principle

Real-time clock (RTC), also known as hardware clock, is used for accurate time measurement, including calendar and clock display, alarm, countdown/countup clock, automatic control and frequency domain system. DS1646-120+ is a real-time clock chip from Maxim Integrated Co. Ltd. It combines the functions of digital watch and count down / count up in a single chip. It features fast start-up, wide-range power supply, a wide range of temperature compensation and low power consumption.

Features

• Pins Name: DS1646-120+
• Power Supply: 2.5V ~ 6V
• High precision: 0.25% Error
• Data Protection: EEPROM Backup
• Real-Time Clock, Calendar, Countdown/Countup Clock, Alarm, and Frequency Domain System
• Ultra Low Power Consumption: 10uA

Working Principle

The DS1646-120+ is designed to provide both processor-interfacing real-time clocks and calendar timers. It could supply both real-time clock (RTC) and calendar functions such as time/date reminder, alarm setting, and frequency domain system. The operating principle of DS1646-120+ is based on digital measurement. The clock chip is able to store the digital information such as time and calendar information in its memory, and convert them into equivalent analog signals during time measurement and calendar calculation. The DS1646-120+ incorporates a 32kHz crystal oscillator for the time base and ultra-low power CMOS for its circuits. Its internal registers can be operated within a wide 7V to 3.3V supply range with microamperes current consumption.

The real-time clock can also be set using software, which is called setting-time. Setting-time operation is activated by providing a low pulse signal to the cycle control pin. Setting-time can be used for updating the century register, or for simple updating of the time/date registers. If setting-time is activated during a leap-year, the month and day registers will automatically be corrected.

Application Field

The DS1646-120+ overall is a sophisticated device with a wide range of application fields. It is widely used in communication and digital equipment, medical instruments, digital watches and other electrical devices. The application areas include:

• Time Setters
• Alarm Clocks
• Home Automation
• Temperature Data Loggers
• Frequency Domain System
• Embedded Systems
• Automated Controllers
• Automated Switches

Conclusion

The DS1646-120+ is a sophisticated real-time clock chip from Maxim Integrated Co. Ltd. It offers fast start-up, low power consumption, wide temperature compensation and real-time clock、calendar、countdown/countup clock, alarm and frequency domain system functions in a single chip. DS1646-120+ is widely used in communication and digital equipment, medical instruments, digital watches and other electrical devices.