PCF8563 Real Time Clock (RTC) IC SOP-8

PCF8563 Real Time Clock (RTC) IC SOP-8 is a highly efficient, ultra-low power consumption clock/calendar chip that provides accurate timekeeping for various embedded systems. Its primary function is to keep track of the current date and time—including years, months, days, weekdays, hours, minutes, and seconds—regardless of whether the main system power is on or off. The PCF8563 operates using a minimal power source, often a small coin cell battery, which enables it to maintain time for years. Engineers and developers value this IC for its reliable accuracy, simple two-wire I²C bus interface, and essential features like programmable alarm and timer functions, making it a crucial component for data logging, scheduling, and power management applications.

Key Features:

• Ultra-Low Power Consumption: It requires minimal current draw from a backup battery, extending the device’s operational life during power outages.
• I²C Bus Interface: Communicates easily with any microcontroller using a standard two-wire interface (SDA and SCL) for simple integration.
• Built-in 32.768 kHz Oscillator: Uses an external quartz crystal (not included) to provide highly accurate time base with minimal drift.
• Alarm and Timer Functions: You can program the chip to generate an interrupt at a specific time (alarm) or after a set duration (timer).
• Clock/Calendar Function: Keeps track of all time elements, including the century and automatic leap year compensation.
• Clock Output Pin: A programmable square-wave output (32 Hz to 512 Hz) is available for driving other devices or synchronization.

Technical Specifications:

• Operating Voltage: 1.0 V to 5.5 V (Wide range)
• Interface: I²C (Two-Wire) Bus Protocol
• Frequency: Requires external 32.768 kHz quartz crystal
• Output Current: 0.1 μA at V_DD = 3.0 V (Typical at T = 25°C)
• Timer Function: Countdown timer with interrupt output
• Package: SOP-8 (Surface Mount)

Mechanical Specifications:

• Pin Count: 8 Pins
• Mounting: Surface Mount Device (SMD)
• Material: Molded plastic package.

Dimensions (SOP-8):

• Body Length: ~4.9 mm
• Body Width: ~3.9 mm
• Pitch (Pin Spacing): 1.27 mm (0.05 in)

Pinout and Wiring:

• Pin 1 (CLKOUT/INT): Programmable clock output or interrupt signal for alarm/timer.
• Pin 2 (V_SS): Ground reference.
• Pin 3 (SDA): Serial Data line for the I²C bus.
• Pin 4 (SCL): Serial Clock line for the I²C bus.
• Pin 5 (CLKIN): Input for the external 32.768 kHz crystal.
• Pin 6 (V_BAT): Backup battery input (connects to a coin cell).
• Pin 7 (NC): No Connection (must be left floating).
• Pin 8 (V_DD): Main power supply input (1.0 V to 5.5 V).
• Wiring Note: Connect SDA and SCL to the microcontroller’s I²C bus. You must connect a 32.768 kHz crystal across CLKIN and V_SS.

Datasheet Reference:

• Download Datasheet

Commonly Used in:

• Data Logging Systems: Timestamping data collected from sensors or industrial processes.
• Utility Metering: Providing reliable time reference for smart meters and power control systems.
• IoT & Automation: Scheduling tasks, sleep modes, and activation times for battery-powered smart devices.

Applications:

• Digital Clocks and Calendars: Providing the primary time source for displays and interfaces.
• Alarm Functions: Implementing wake-up timers or event-triggered actions in embedded devices.
• Power Cycling: Programming system shutdowns and restarts to optimize battery life.
• Camera Time-Lapse: Accurately spacing photo captures over long periods.

Equivalent Models:

• DS1307: A very popular, simple RTC chip with I²C interface, but typically requires 5V logic.
• DS3231: A highly accurate, temperature-compensated RTC with I²C interface, often chosen when precision timing is critical.

Package Includes:

• 1 x PCF8563 Real Time Clock (RTC) IC SOP-8