PCF2129AT datasheet(1/68 Pages) NXP

Il numero della parte	PCF2129AT

Spiegazioni elettronici	Integrated RTC, TCXO and quartz crystal

PDF	68 Pages

Scroll/Zoom	100%

Produttore elettronici	NXP [NXP Semiconductors]

Homepage	http://www.nxp.com

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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 =20mA 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 V

DD = 3.0 V and Tamb =25 °C

Automatic leap year correction

PCF2129A

Integrated RTC, TCXO and quartz crystal

Rev. 01 — 13 January 2010

Product data sheet

1.

The definition of the abbreviations and acronyms used in this data sheet can be found in Section 17.

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