DS1339AD+T

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DS1339AD+T is a real time clock and calendar device that is used to provide time and date information for applications such as timekeeping, logging and scheduling. The device features low power consumption, automatic correction for leap year and daylight savings time, and includes an internal oscillator and clock calendar.

Application Field:

The DS1339AD+T is suitable for applications where clock accuracy is important, such as handheld computers, personal digital assistants (PDAs), global positioning systems (GPSs), test equipment, security systems, and other electronic systems. It is also suitable for applications such as timekeeping, logging, and scheduling, including calculators, income tax preparation software, and domestic and business scheduling.

Working Principle:

The DS1339AD+T works by combining a clock calendar, a clock oscillator, a real time clock, and a digital logic circuit. The clock calendar keeps track of the day of the week, the month, the year, and other parameters, such as leap year and daylight savings time. The clock oscillator provides long-term time accuracy, with a quartz crystal oscillator providing an accurate clock frequency. The real time clock outputs accurate second and minute values with a low current consumption. Finally, the digital logic circuit performs the necessary calculations to provide the time and date information to the application.

The time is set by writing a time value to the clock calendar, and the date is set by writing a date value to the clock calendar. The time value is a two-byte record that contains the seconds, minutes, hours, day of the week, and day of the year. The date value is a three-byte value that contains the month, day, and year. The device also supports an alarm mode, in which the time and date can be set to trigger an interrupt when a specific time and date value is reached.

The DS21339AD+T also supports a "watchdog" mode where the device will issue a reset signal if it does not receive a valid data set in a certain period of time. This ensures that if an application is running for too long, the device will reset the system and start from a known state.

The device includes an on-chip battery, allowing it to retain its time and date information even when disconnected from the power supply. This ensures that the device will always have the correct time and date information, even when power is cycled or when the device is in standby mode.

In summary, the DS1339AD+T real time clock is a powerful and accurate device for applications that require time and date information. The device offers low power consumption, automatic correction for leap year and daylight savings time, and an internal oscillator and clock calendar with high accuracy. The device also features an on-chip battery, allowing it to retain time and date even when disconnected from the power supply.

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