DS17887-3IND+

Interface:	Parallel
Base Part Number:	DS17887
Supplier Device Package:	24-EDIP
Package / Case:	24-DIP Module (0.600", 15.24mm)
Mounting Type:	Through Hole
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:	8KB
Features:	Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output
Type:	Clock/Calendar
Part Status:	Active
Packaging:	Tube

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DS17887-3IND+ Real Time Clock

The DS17887-3IND+ is a real time clock with integrated calendar and battery-backed RAM. It also offers a range of alarm and timer functions suitable for sophisticated applications. With its integrated calendar and RAM, the DS17887-3IND+ allows for highly accurate and automated timekeeping, which is an essential component for many embedded projects.

Application Field

The DS17887-3IND+ is a versatile real time clock with a broad range of applications. For example, it can be used for:1. Automated data logging for machine or building automation such as temperature, view or sound recording.2. Time-dependent lighting or climate control in buildings.3. Accurate time calculation for network protocols such as DHCP or NTP.4. Alarm and timer functions – set alarms and timers based on any date and time. It can also be used as a watchdog timer to monitor system health.5. Embedded HMI applications – display time accurately, generate time-dependent messages, or log events like touch or button presses in time-based intervals.6. Timekeeping and control in industrial devices like PLCs and HMIs.7. Automated monitoring and logging of digital measurements in data acquisition products.The DS17887-3IND+ also has potential applications in radio network-based devices such as GSM phones and cab radios, as well as various embedded systems.

Working Principle

The DS17887-3IND+ is based on the I 2 C-bus protocol for communication and control. It integrates the common integrated realtime clock (RTC) and RAM controller features, including calendar and alarm functions.The device includes a 32 kHz crystal oscillator, which is used for timing accuracy. Its highly accurate timing allows for time synchronization on the I 2 C-bus, even when the processor is in idle mode. The oscillator can be set at 32.768 kHz or 32 kHz.The device can be set to generate an interrupt pulse in order to communicate with the processor. This can be used to trigger timers and alarms. It also has an individual temperature-compensated oscillator (TCXO) that ensures accuracy and clock stability across a wide temperature range.The DS17887-3IND+ also consists of a 32-byte RAM with battery-backed memory. The battery-backed RAM can store necessary data to maintain time and date information while the system is powered off, allowing time and date to remain accurate even during system power cycles, or when the main processor has failed.The device also supports several internal alarms and timers for operations such as periodic interrupt generation. An adjustable 1% current-source is also included to maintain accurate timekeeping by providing power to an external back-up battery when the device is powered off.The DS17887-3IND+ also supports a wide input range, from 2.3V to 5.25V, which allows for compatibility with a broad range of embedded systems.

Conclusion

The DS17887-3IND+ is an excellent real time clock for many embedded applications, offering features like battery-backed RAM, alarms and timers functions, and high accuracy timekeeping. It is well suited for applications such as automated data logging, time-dependent lighting and climate control, and timekeeping in industrial devices. With its I 2 C-bus communication, adjustable oscillator, and wide voltage range, the DS17887-3IND+ is an ideal choice for many applications.

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