PCF2127AT/2Y  Description

The PCF2127AT/2Y 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.

PCF2127AT/2Y Features

• UL Recognized Component

• Operating temperature range from -40 ℃ to +85 ℃

• Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors

• 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

• 512 bytes of general-purpose static RAM

• 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

• Extra power fail detection function with input and output pins

• Power-On Reset Override (PORO)

• Oscillator stop detection function

• Interrupt output (open-drain)

PCF2127AT/2Y Applications

• 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