X1227S8I-2.7AT2

Interface:	I²C, 2-Wire Serial
Base Part Number:	X1227
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Current - Timekeeping (Max):	10µA ~ 20µA @ 2.7V ~ 5V
Voltage - Supply, Battery:	1.8 V ~ 5.5 V
Voltage - Supply:	2.7 V ~ 5.5 V
Series:	--
Date Format:	YY-MM-DD-dd
Time Format:	HH:MM:SS (12/24 hr)
Memory Size:	--
Features:	Alarm, Leap Year, Supervisor, Watchdog Timer
Type:	Clock/Calendar
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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• X1227S8I-2.7AT2 application field and working principle

Real-time clock (RTC) modules are electronic clocks that are used to measure and record the time of events in digital systems. They are also commonly used to maintain the date and time of day. RTC modules, such as the X1227S8I-2.7AT2, are readily available, highly reliable devices with low power consumption, making them ideal for many application fields. This article will discuss the application fields and working principle of the X1227S8I-2.7AT2 as well as outline the advantages and disadvantages of using an RTC module.The X1227S8I-2.7AT2 is a small, low-power, battery-backed real-time clock module, ideal for application fields such as:

• General-purpose timing and alarm applications.
• Data logging applications.
• Power-down time maintaining systems.
• Applications where calendar functions are needed.

The X1227S8I-2.7AT2 is a highly reliable device as it combines a 2.7V, low power, battery-backed RTC, a frequency-tuned 32kHz crystal oscillator, and an SRAM chip in a compact, easy-to-use package. This real-time clock module utilizes the Saffron PCF8563 real-time clock IC. It is a low-frequency and low-power clock with battery backup.The main components of the X1227S8I-2.7AT2 are the PCF8563 real-time clock, the power-failure detect circuit, the 32kHz crystal oscillator, the SRAM chip, and the Lithium Cell. The PCF8563 is an ultra-low power CMOS Real-Time Clock which combines the functions of a frequency-controlled oscillator, timer, and interrupt generator with an SRAM chip.This real-time clock runs at 12.5MHz and its battery can last up to a year on a single charge.The 32kHz crystal oscillator is used to provide a precise time reference for the RTC. This oscillator tunes and stabilizes the clock frequency to 32.768kHz and also has a maximum frequency tolerance of +/-20ppm. The SRAM chip in the X1227S8I-2.7AT2 is used for storing the time information, alarms, and flags like power-fail reset status. The X1227S8I-2.7AT2 is powered from a switchable battery supply circuit which is composed of a Lithium Cell, a voltage regulator, and a voltage monitor. The voltage regulator maintains the voltage supplied to the chip by reducing the Lithium Cell voltage to 3.0V. The voltage monitor monitors the voltage of the battery, and signals if the voltage of the battery is below the threshold.The working principle of the X1227S8I-2.7AT2 is quite simple. The PCF8563 runs at a frequency of 12.5MHz and keeps track of time. The 32kHz crystal oscillator provides a precise calibrated time reference for the RTC. The SRAM chip stores the various time and date information as well as the alarms, flags, and other data. The Li Ion Cell provides power to the chip and the voltage regulator ensures that the correct voltage is applied to the chip. The voltage monitor detects the battery voltage and signals if it drops below the threshold.The advantages of using the X1227S8I-2.7AT2 are that it is small, low power, and highly reliable. It also has a low frequency and low power consumption, and it has a long-lasting battery backup of up to a year. In addition, it combines the features of a timer, an oscillator, and interrupt generator making it ideal for data logging and general-purpose timing and alarm applications.The disadvantages of using the X1227S8I-2.7AT2 are that the real-time clock is a little expensive, the frequency tolerance is limited to +/-20ppm, and there is the possibility that the backup battery life could degrade over time.In conclusion, the X1227S8I-2.7AT2 is an ideal real-time clock module for a variety of applications. It is highly reliable with a battery backup of up to a year, low power and low-frequency characteristics, and a range of other features such as a frequency-controlled oscillator and SRAM chip. While it does have some disadvantages, such as limited frequency tolerance and a higher cost, it is ideal for data logging, general-purpose timing and alarm applications, and power-down time maintaining systems.

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