General description

The PCF8563 is a CMOS real-time clock/calendar optimized for low power

consumption. A programmable clock output, interrupt output and voltage-low detector

are also provided. All address and data are transferred serially via a two-line

bidirectional I2C-bus. Maximum bus speed is 400 kbits/s. The built-in word address

register is incremented automatically after each written or read data byte.

Features

■ Provides year, month, day, weekday, hours, minutes and seconds based on 32.768 kHz quartz crystal

■ Century flag

■ Wide operating supply voltage range: 1.0 to 5.5 V

■ Low back-up 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 to 5.5 V)

■ Programmable clock output for peripheral devices: 32.768 kHz, 1024 Hz, 32 Hz and 1 Hz

■ Alarm and timer functions

■ Voltage-low detector

■ Integrated oscillator capacitor

■ Internal power-on reset

■ I2C-bus slave address: read A3H; write A2H

■ Open drain interrupt pin.

Applications

■ Mobile telephones

■ Portable instruments

■ Fax machines

■ Battery powered products.