PCF2129T/2,518

Interface:	I²C, 2-Wire Serial
Base Part Number:	PCF2129
Supplier Device Package:	16-SO
Package / Case:	16-SOIC (0.295", 7.50mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Current - Timekeeping (Max):	1.5µA @ 3.3V
Voltage - Supply, Battery:	1.8 V ~ 4.2 V
Voltage - Supply:	1.8 V ~ 4.2 V
Series:	--
Date Format:	YY-MM-DD-dd
Time Format:	HH:MM:SS (12/24 hr)
Memory Size:	--
Features:	Alarm, Leap Year, Square Wave Output, TCXO/Crystal, Watchdog Timer
Type:	Clock/Calendar
Part Status:	Active
Packaging:	Tape & Reel (TR)

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PCF2129T/2,518 Application Field and Working PrincipleThe PCF2129T is a Real Time Clock (RTC) designed by NXP Semiconductor. It is designed to be used in applications that require accurate time and date information such as factory automation, home automation, sensitive industrial and medical equipment, or internet of things products. The PCF2129T is a combination of a low-power (0.2µW) 32kHz oscillator and an IC, with a built-in 32kHz crystal, a battery backup and optional I/O pins. The combination of the low power and the tight integration of the components enables reliable, competitively priced time-keeping applications. This paper will discuss the application fields and working principles of the device in more detail. ApplicationsThe PCF2129T is used in a wide variety of applications. For instance, in factory automation, the device\'s accurate time keeping information facilitates the scheduling of machines and processes. Home automation is another major application of the PCF2129T. It allows for the convenient and efficient control of home appliances. Additionally, the device is used in sensitive industrial and medical equipment, as well as in internet of things products. The PCF2129T\'s low power operation allows it to be integrated in battery operated applications, in order to benefit from the device\'s accurate time keeping capabilities while conserving power. This makes the device a perfect choice for medical applications such as monitors, beds and infusion pumps that require constant time-keeping accuracy.Working PrincipleThe PCF2129T works by keeping track of date and time, without any additional external components. The device consists of an oscillator and an integrated circuit that are connected to a 32 kHz crystal. The oscillator drives the crystal for reference time-keeping. The integrated circuit includes a 32kHz oscillator, a battery backup and optional I/O pins that may be used to pass data from one device to another.The oscillator\'s job is to accurately maintain the frequency of the 32kHz crystal oscillator. The IC continuously monitors the crystal frequency to ensure it doesn\'t drift. The integrated circuit also reads the real time information such as date, time and day of the week, as well as a list of alarms and events. The built-in battery backup ensures that the device\'s time-keeping functions continue even when the device is powered down. The optional I/O pins allow for communication with other devices, and can be used to set the time-keeping parameters from another device.ConclusionThe PCF2129T is an advanced RTC that provides low-power, accurate time-keeping information. The device is used in a variety of applications, from factory automation to home automation and beyond. Its combination of a low-power oscillator and an integrated circuit with a 32kHz crystal and on-board battery backup make it a reliable choice for time-keeping applications.

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