PCF2127 데이터 시트보기 (PDF) - NXP Semiconductors.
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PCF2127 Datasheet PDF : 101 Pages
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PCF2127
Accurate RTC with integrated quartz crystal for industrial
applications
Rev. 8 — 19 December 2014
Product data sheet
1. General description
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.
For a selection of NXP Real-Time Clocks, see Table 94 on page 89
2. 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. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 21.
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