PCF2129
Overview
The PCF2129 is a CMOS1 Real Time Clock (RTC) and calendar with an integrated Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz crystal optimized for very high accuracy and very low power consumption. The PCF2129 has a selectable I2C-bus or SPI-bus, a backup battery switch-over circuit, a programmable watchdog function, a timestamp function, and many other features.
- UL Recognized Component (PCF2129AT and PCF2129T)
- Operating temperature range from -40 °C to +85 °C
- Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors
- Typical accuracy: - PCF2129AT: ±3 ppm from -15 °C to +60 °C - PCF2129T: ±3 ppm from -30 °C to +80 °C
- Integration of a 32.768 kHz quartz crystal and oscillator in the same package
- Provides year, month, day, weekday, hours, minutes, seconds, and leap year correction
- Timestamp function - with interrupt capability - detection of two different events on one multilevel input pin (for example, for tamper detection)
- Two line bidirectional 400 kHz Fast-mode I2C-bus interface
- Three line SPI-bus with separate data input and output (maximum speed 6.5 Mbit/s)
- Battery backup input pin and switch-over circuitry
