NXP Semiconductors PCF2127
The PCF2127 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 PCF2127 has 512 bytes of general-purpose static RAM, a selectable I2C-bus or SPI-bus, a backup battery switch-over circuit, a programmable watchdog function, a timestamp function, and many other features. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 21.| Part No. | PCF2127 |
|---|---|
| Datasheet | PCF2127 Download |
| Manufacturer |  NXP Semiconductors |
| Description | Accurate RTC |
| Buy | Stock & Price |
FEATURES AND BENEFITS
● UL Recognized Component● Operating temperature range from 40 C to +85 C
● Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors
● Typical accuracy:
● PCF2127AT: 3 ppm from 15 C to +60 C
● PCF2127T: 3 ppm from 30 C to +80 C
● 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
● 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
● Extra power fail detection function with input and output pins
● Power-On Reset Override (PORO)
● Oscillator stop detection function
● Interrupt output (open-drain) 1.
