Real-Time Clock/Calendar

PCF8563

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The PCF8563 is a CMOS 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.

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Block Diagram

Block diagram: PCF8563BS, PCF8563P, PCF8563T, PCF8563TS, PCF8564ACX9, PCF8564AU

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Features

  • 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 target address: read A3h and write A2h
  • Open-drain interrupt pin

Target Applications

  • Mobile telephones
  • Portable instruments
  • Electronic metering
  • Battery powered products

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