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Home » NEWEST Products » New by Manufacturer » NXP Semiconductors » PCF2129T Accurate Real Time Clock - NXP
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NXP PCF2129T Accurate Real Time Clock

NXP PCF2129T Accurate Real Time Clock

NXP's PCF2129T Accurate Real Time Clock is a CMOS Real Time Clock (RTC) and calendar with an integrated Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768kHz quartz crystal optimized for very high accuracy and very low power consumption. The PCF2129T 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. Typical applications include electronic metering, precision timekeeping, and GPS equipment.

  • Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors
  • Typical accuracy: ±3ppm from -30ºC to +80ºC
  • Integration of a 32.768kHz 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 6.5Mbit/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)
  • Programmable 1 second or 1 minute interrupt
  • Programmable watchdog timer with interrupt
  • Programmable alarm function with interrupt capability
  • Programmable square output
  • Clock operating voltage: 1.8V to 4.2V
  • Low supply current: typical 0.70µA at VDD = 3.3V

  • 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
Block Diagram
Block Diagram
  • NXP Semiconductors
  • Semiconductors|Integrated Circuits|IC-Clock & Timer