PCF2129T 데이터 시트보기 (PDF) - NXP Semiconductors.
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PCF2129T Datasheet PDF : 73 Pages
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PCF2129T
Accurate RTC with integrated quartz crystal for industrial
Rev. 3 — 12 February 2013
Product data sheet
1. General description
The PCF2129T 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 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.
2. Features and benefits
Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors
Typical accuracy: 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
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)
Programmable 1 second or 1 minute interrupt
Programmable watchdog timer with interrupt
Programmable alarm function with interrupt capability
Programmable square output
Clock operating voltage: 1.8 V to 4.2 V
Low supply current: typical 0.70 A at VDD = 3.3 V
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 18.
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