NXP SEMICONDUCTORS PCF2131 NANO-POWER HIGHLY ACCURATE RTC

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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

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