NXP Semiconductors PCF8523 Real-Time Clock (RTC) & Calendar
NXP Semiconductors PCF8523 Real-Time Clock (RTC) and Calendar is optimized for low power consumption, with automatic switching to battery on main power loss. Data is transferred serially via an I
2C-bus with a maximum data rate of 1000kbit/s. Alarm and timer functions are available with the possibility to generate a wake-up signal on an interrupt pin. An offset register allows fine-tuning of the clock.
Features
- Provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768kHz quartz crystal
- Resolution: seconds to years
- Clock operating voltage: 1.0V to 5.5V
- Low backup current: typical 150nA at VDD = 3.0V and Tamb = 25°C
- 2 line bidirectional 1MHz Fast-mode Plus (Fm+) I2C interface, read D1h, write D0h
- Battery backup input pin and switch-over circuit
- Freely programmable timer and alarm with interrupt capability
- Selectable integrated oscillator load capacitors for CL = 7pF or CL = 12.5pF
- Internal Power-On Reset (POR)
- Open-drain interrupt or clock output pins
- Programmable offset register for frequency adjustment
Applications
- Time keeping application
- Battery powered devices
- Metering
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