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