PCF8563

A low-power CMOS real-time clock/calendar chip featuring a programmable clock output, an interrupt output, and a power-fail detector. All addresses and data are transferred serially via the I²C bus interface. The maximum bus speed is 400Kbits/s, and the embedded word address register auto-increments after each read/write operation.

Applications

• Portable media players
• Mobile phones
• Multi-rate electricity meters, IC card water meters, IC card gas meters
• Fax machines
• Security electronics

Key features

• Timekeeping in seconds, minutes, hours, day of week, date, month, and year based on 32.768kHz crystal
• Century indicator
• Wide operating voltage range: 1.8~5.5V
• Low standby current: typical 0.25μA (ΔVDD = 3.0V, TA = 25°C)
• I²C bus slave address: read, 0A3H; write, 0A2H
• Programmable clock output frequencies: 32.768kHz, 1024Hz, 32Hz, 1Hz
• Alarm and timer
• Power-down detector
• Integrated internal oscillator capacitors
• Open-drain interrupt pin
• Fully compatible with PCF8563