NXP Semiconductors PCF2131 Nano-Power Highly Accurate RTC

NXP Semiconductors PCF2131 Nano-Power Highly Accurate Real-Time Clock (RTC) features an integrated Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768kHz quartz crystal. The PCF2131 is optimized for very high accuracy and ultra-low power consumption. The PCF2131 offers a selectable I²C-bus or SPI-bus, a backup battery switch-over circuit, a programmable watchdog function, four timestamps function, and many other features.

The NXP PCF2131 Nano-Power Highly Accurate RTC has an operating temperature range from -40°C to +85°C in an HLSON 16 package.

Features

• Operating temperature range from -40°C to +85°C
• Temperature Compensated Crystal Oscillator (TCXO) with trimmed integrated capacitors
• Ultra-low supply current of typical 64nA at V_DD = 3.3V
• Temperature-compensated RTC, typical accuracy ±3ppm from -40°C to +85°C
• Integration of a 32.768kHz quartz crystal and oscillator in the same package
• Provides year, month, day, weekday, hours, minutes, seconds, and 1/100 seconds
• Provides leap year correction
• Timestamp function
  • With interrupt capability
  • Detection of four different events on four input pins (for example, for tamper detection)
• 2-line bidirectional 400kHz Fast-mode I²C-bus interface
• 4-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
• Power-On Reset (POR)
• Power-On Reset Override (PORO) function
• Software reset function
• Two interrupt outputs (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 of 1.2V to 5.5V

more information: https://www.nxp.com/products/peripherals-and-logic/signal-chain/real-time-clocks/rtcs-with-temperature-compensation/nano-power-highly-accurate-rtc-with-integrated-quartz-crystal:PCF2131