General description
The PCF8563 is a CMOS1 Real-Time Clock (RTC) and calendar optimized for low power consumption. A programmable clock output, interrupt output, and voltage-low detector are also provided. All addresses and data are transferred serially via a two-line bidirectional I2C-bus. Maximum bus speed is 400 kbit/s. The register address is incremented automatically after each written or read data byte.

Features and benefits
■ Provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal
■ Century flag
■ Clock operating voltage: 1.0 V to 5.5 V at room temperature
■ Low backup current; typical 0.25 μA at VDD = 3.0 V and Tamb = 25 °C
■ 400 kHz two-wire I2C-bus interface (at VDD = 1.8 V to 5.5 V)
■ Programmable clock output for peripheral devices (32.768 kHz, 1.024 kHz, 32 Hz, and 1 Hz)
■ Alarm and timer functions
■ Integrated oscillator capacitor
■ Internal Power-On Reset (POR)
■ I2C-bus slave address: read A3h and write A2h
■ Open-drain interrupt pin

Applications
■ Mobile telephones
■ Portable instruments
■ Electronic metering
■ Battery powered products