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The PCF8563S is a real-time clock (RTC) and calendar IC manufactured by NXP Semiconductors.

Specifications:

• Interface: I²C-bus (400 kHz)
• Operating Voltage: 1.0V to 5.5V
• Low Power Consumption: Typically 0.25 µA at 3V
• Clock Frequency: 32.768 kHz
• Timekeeping Accuracy: ±5 ppm at 25°C
• Alarm Function: Programmable alarm with interrupt output
• Timer Function: Countdown timer with interrupt
• Clock Output: Programmable clock output (32.768 kHz, 1.024 kHz, 32 Hz, 1 Hz)
• Temperature Range: -40°C to +85°C
• Package: SO8, TSSOP8

Descriptions:

• The PCF8563S is a low-power CMOS RTC optimized for battery-powered applications.
• It provides seconds, minutes, hours, day, date, month, year, and weekday information.
• Includes automatic leap-year correction and century recognition.
• Features a built-in oscillator circuit for the 32.768 kHz quartz crystal.

Features:

• Battery Backup Support: Maintains timekeeping during power loss.
• I²C Communication: Simple interfacing with microcontrollers.
• Low Voltage Operation: Suitable for portable and embedded systems.
• Programmable Alarm & Timer: Can trigger interrupts for system wake-up.
• Minimal External Components: Requires only a crystal and decoupling capacitor.

This IC is commonly used in consumer electronics, industrial systems, and IoT devices requiring accurate timekeeping.