PCF2129AT/2,518

Interface:	I²C, 2-Wire Serial
Base Part Number:	PCF2129
Supplier Device Package:	20-SO
Package / Case:	20-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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PCF2129AT/2518 Application Field and Working PrincipleReal Time Clocks are an essential part of any computer system and must be working accurately in order to ensure a smooth operation. A Real Time Clock (RTC) is a circuit that keeps track of the current time and date even when there is no power to the computer. The goal is to keep the time updated even when all other computer components are off. This is important for example for data loggers as correct time and date needs to be provided for keeping records.The PCF2129AT/2518 is such a Real Time Clock IC from NXP Semiconductors, previously from Philips Semiconductors. PCF2129AT/2518 is a highly accurate clock/calendar circuit. It receives and stores time from an external 32.768 kHz crystal and provides a variety of highly accurate timing features.

Features:

The PCF2129AT/2518 has several features that make it a great choice as an RTC:• Data Retention: The clock has very low power consumption and can store data even when the power is off.• Crystal Accuracy: The external crystal is tuned to maintain accuracy of 2.2 PPM over the full operating temperature range of -40°C to +85°C.• Different Mode Options: The RTC can be used in 4 different modes: stand-alone real-time clock, battery-backed clock, alarm clock and timer, or calendar.• Time Tracking: The clock can track time in hours, minutes and seconds. It also has a 24-hour format option and a daylight saving time option. • Programmability: It is fully programmable and can be programed in software or by external hardware for specific applications.• Battery Powered: It can be powered by an internal battery, which is an optional feature.

Application:

The PCF2129AT/2518 is a highly accurate real-time clock IC, which makes it the perfect choice for any application where precise timekeeping is required. It is used in industrial, automotive and consumer products, including data loggers, smart meters, security systems, automotive instrumentation, gaming systems, and more.

Working Principle:

The RTC works by receiving and storing time from an external 32.768 kHz crystal. The crystal oscillates at this frequency and is used to synchronize the timing of the RTC. This synchronization is used to keep track of the current time and date.The RTC is powered by an internal battery and can optionally be powered by an external battery. This allows the RTC to continue operating even when main power is lost. This ensures that time and date is tracked accurately, even if the main power supply is disrupted.The RTC has a variety of different features and settings. These can be programmed in software, or by external hardware for specific applications. It can track time in hours, minutes and seconds, as well as provide calendar functions such as date and day of the week. It can also be used in alarm and timer mode, with a programmable alarm for specific alert purposes.

Conclusion:

The PCF2129AT/2518 real-time clock is an essential tool for any application that requires accurate timekeeping and data retention. It is a highly accurate, low power consumption device that can be used in a variety of different modes and settings. This makes it an ideal choice for applications such as data loggers, smart meters, gaming systems and more.

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