DS17285S-3NT

Interface:	Parallel
Base Part Number:	DS17285
Supplier Device Package:	24-SOIC
Package / Case:	24-SOIC (0.295", 7.50mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Current - Timekeeping (Max):	2mA @ 2.7V ~ 3.7V
Voltage - Supply, Battery:	2.5 V ~ 3.7 V
Voltage - Supply:	2.7 V ~ 3.7 V
Series:	--
Date Format:	YY-MM-DD-dd
Time Format:	HH:MM:SS (12/24 hr)
Memory Size:	2KB
Features:	Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output
Type:	Clock/Calendar
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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DS17285S-3NT Real Time Clock

The DS17285S-3NT is a high-end real-time clock for use in a variety of applications. The DS17285S-3NT is a programmable RTC with a 56-bit time-keeping register that provides a count of seconds, minutes, hours, days, weeks, months, and years. The DS17285S-3NT also comes equipped with advanced features like wide temperature range, extended power supply options, and auto-calibration, making it one of the best real-time clocks on the market.

Application Field

The DS17285S-3NT is a versatile RTC that can be used in numerous applications. It is especially suited for systems that need to keep track of time without battery assistance, such as medical equipment, automotive applications, and telecommunications systems. It is also ideal for use in industrial controllers, embedded systems, distributed measurement systems, and energy management systems.

Working Principle

The DS17285S-3NT is a digital device that utilizes a count sequence commencing from zero at 00:00:00 and increments for every second. It is programmed with a time resolution range from 1 minute to 59 seconds and has a time validity range from 00:00:00 to 11:59:59 each day, 12 or 24-hour format selectable with different accuracy values and temperature ranges. The DS17285S-3NT contains a dedicated time-keeping register to keep time even in complete power loss. When power is restored, the RTC resumes time keeping and continues to count as previously programmed. It is also able to auto calibrate every 64 years without user intervention, ensuring accurate time clues.The accuracy of the Real Time Clock depends on the selected temperature range, external crystal type and size, and the power supply design.

Power Supply

The DS17285S-3NT is designed to be powered conventionally by a 3.3V lithium cell or externally by an external battery, as well as off-the-shelf batteries. To maximize power efficiency, the Real Time Clock can be powered by low power consumption schemes such as battery-backed SRAM, LDO regulators, and low drop-outs (LDO).

Accuracy and Temperature Range

The DS17285S-3NT can operate in environments with temperatures ranging from -40°C to +85°C, providing tight timekeeping under a wide range of temperatures. It comes with +/-3% accuracy at 25°C and better than +/- 5% accuracy at full temperature range.

Conclusion

The DS17285S-3NT is a versatile high-end real-time clock for use in a variety of applications to keep time without battery assistance. It is capable of operating in a wide range of temperatures and has an accuracy of +/-3% at 25°C and better than +/- 5% accuracy at full temperature range. The RTC also has an automatic calibration feature that allows it to adjust itself to keep time accurately and endure a complete power loss.

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