Tiny Real-Time Clock/calendar with alarm function and I²C-bus

With clock operating voltage of 0.9V to 5.5V, 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.

Tiny Real-Time Clock:calendar with alarm function and I²C-bus

Block Diagram

Why Used

  • 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)
  • Provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal
  • 400 kHz two-line I²C-bus interface (at VDD = 1.8 V to 5.5 V)
  • Low current; typical 0.27 μA at VDD = 3.0 V and Tamb= 25 °C
  • Selectable integrated oscillator load capacitors for CL= 7 pF or CL = 12.5 pF

Where Used

  • Battery powered devices
  • Digital video camera
  • Digital still camera
  • Printers
  • Mobile equipment

 Read more…