Integrated RTC TCXO and quartz crystal - NXP Semiconductors
Description
PCF2129A
Integrated RTC, TCXO and quartz crystal
Rev.
01 — 13 January 2010
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Product data sheet
1.
General description
The PCF2129A is a CMOS1 real time clock 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 PCF2129A 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
Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors Accuracy: ±3 ppm from −15 °C to +60 °C Integration of a 32.
768 kHz quartz crystal and oscillator in the same package Provides year, month, day, weekday, hours, minutes, and seconds Timestamp function with interrupt capability detection of two different events on one multilevel input pin (e.
g.
for tamper detection) Two line bidirectional 1 MHz Fast-mode Plus (Fm+) I2C-bus interface (IOL = 20 mA at pin SDA) 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 pin 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 and reset capability Programmable alarm function with interrupt capability Programmable square wave open-drain output pin Clock operating voltage: 1.
2 V to 4.
2 V Low supply current: typical 0.
65 μA at VDD = 3.
0 V and Tamb = 25 °C Automatic leap year correction
1.
The definition of the abbreviations and acronyms used in this data sheet can be found in Section 17.
NXP Semiconductors
PCF2129A
www.
DataSheet4U.
com Integrated RTC, TCXO and quartz crystal
3.
Applications
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