NXP PCA2129T/Q900/2,51

The PCA2129 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 PCA2129 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 (PCA2129T/Q900/2)
• AEC-Q100 compliant for automotive applications
• Operating temperature range from -40 ℃ to +85 ℃
• Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors
• Typical accuracy: ±3 ppm from -30 ℃ to +80 ℃
• 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
• 3 line SPI-bus with separate data input and output (maximum speed 6.5 Mbit/s)
• Battery backup input pin and switch-over circuitry
• Battery backed output voltage
• Battery low detection function
• Power-On Reset Override (PORO)
• Oscillator stop detection function
• Interrupt output (open-drain)
• Programmable 1 second or 1 minute interrupt
• Programmable watchdog timer with interrupt
• Programmable alarm function with interrupt capability
• Programmable square output
• Clock operating voltage: 1.8 V to 4.2 V
• Low supply current: typical 0.70 μA at VDD = 3.3 V

• Electronic metering for electricity, water, and gas
• Precision timekeeping
• Access to accurate time of the day
• GPS equipment to reduce time to first fix
• Applications that require an accurate process timing
• Products with long automated unattended operation time