NXP PCF8563TS/5,118

PCF8563 is a low-power CMOS real-time clock/calendar IC featuring programmable clock output, interrupt output, and low-voltage detection. All addresses and data are transferred serially via a two-wire bidirectional I2C bus at a maximum rate of 400 kbps. The register address auto-increments after each read/write data byte.

• Year, month, day, day-of-week, hour, minute, and second timekeeping based on 32.768kHz crystal
• Century flag
• Clock operating voltage: 1.0 - 5.5V (room temperature)
• Low standby current; typical 0.25μA (VDD = 3.0V, Tamb = 25°C)
• 400kHz two-wire I2C bus interface (VDD = 1.8 - 5.5V)
• Programmable clock output (32.768kHz, 1.024kHz, 32Hz, and 1Hz)
• Alarm and timer functions
• Integrated crystal capacitors
• Internal power-on reset (POR)
• I2C bus slave address: read: A3h; write: A2h
• Open-drain interrupt pin