PCF8523 Description
The PCF8523 is a CMOS1 Real-Time Clock (RTC) and calendar optimized for low power consumption. Data is transferred serially via the I2C-bus with a maximum data rate of 1000 kbit/s. Alarm and timer functions are available with the possibility to generate a wake-up signal on an interrupt pin.
PCF8523 Key Features
- Provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal
- Resolution: seconds to years
- Clock operating voltage: 1.0 V to 5.5 V
- Low backup current: typical 150 nA at VDD = 3.0 V and Tamb = 25 C
- 2 line bidirectional 1 MHz Fast-mode Plus (Fm+) I2C interface, read D1h, write D0h2
- Battery backup input pin and switch-over circuit
- Freely programmable timer and alarm with interrupt capability
- Selectable integrated oscillator load capacitors for CL = 7 pF or CL = 12.5 pF
- Oscillator stop detection function
- Internal Power-On Reset (POR)