DS1339U-3+T&R

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DS1339U-3+T&R is a real-time clock (RTC) device produced by Dallas Semiconductor. It is a low power, low voltage CMOS integrated circuit designed to provide an interface between a host processor and a calendar with time and date display. The device utilizes a precision oscillator, and contains a battery to provide continuous clock operation, independent of power supply interruptions.

The DS1339U-3+T&R has a wide variety of applications in many electronic devices, including embedded systems, where it can be used to provide time and date information. The device can be programmed to activate predetermined routines and processes at specified intervals, such as for security systems, temperature and environment control, vending machine operation and other embedded applications.

At its core, the DS1339U-3+T&R is a digital calendaring device. It features a real-time clock/calendar, a backup battery monitoring circuit, and dedicated lines which permit direct interfacing to a host processor. A host processor can access the device in either I2C or SPI format.

In its typical mode of operation, the real-time clock/calendar is designed to provide time and date information with a resolution of one second. The device contains a real-time clock/calendar circuit with an adjustable countdown timer, plus a backup battery monitoring circuit, a selectable clock/calendar mode, and an input/output port. The device can be set to operate in either 12 or 24 hour format, and the date and time are displayed in BCD format.

The backup battery monitoring circuit is designed to switch the device’s oscillator to the backup battery supply for continuous operation during power supply interruptions. The countdown timer of the device is used to trigger a predetermined action at the end of the countdown interval, such as the activation of an alarm or an output port. The selectable clock/calendar mode provides a means of setting the device to operate in either 12 or 24 hour format.

The DS1339U-3+T&R is a low cost, low power, and low voltage device and a great asset for embedded applications. It is a fairly simple device to program and set up, making it easy to use and incorporate into existing systems. Its ability to provide time and date information makes it a great choice for embedded systems where such information is critical, and its ability to trigger predetermined actions at specified intervals makes it an even more attractive option.

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