1 General description

The PCF85063A is a CMOS1 Real-Time Clock (RTC) and calendar optimized for low power consumption. An

offset register allows fine-tuning of the clock. All addresses and data are transferred serially via the two-line

bidirectional I2C-bus. Maximum data rate is 400 kbit/s. The register address is incremented automatically after

each written or read data byte.

2 Features and benefits

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

? Clock operating voltage: 0.9 V to 5.5 V

? Low current; typical 0.22 μA at VDD = 3.3 V and Tamb = 25 °C

? 400 kHz two-line I2C-bus interface (at VDD = 1.8 V to 5.5 V)

? Programmable clock output for peripheral devices (32.768 kHz, 16.384 kHz, 8.192 kHz, 4.096 kHz, 2.048

kHz, 1.024 kHz, and 1 Hz)

? Selectable integrated oscillator load capacitors for CL = 7 pF or CL = 12.5 pF

? Alarm function

? Countdown timer

? Minute and half minute interrupt

? Oscillator stop detection function

? Internal Power-On Reset (POR)

? Programmable offset register for frequency adjustment

3 Applications

? Digital still camera

? Digital video camera

? Printers

? Copy machines

? Mobile equipment

? Battery powered devices