PCF2129A datasheet(1/69 Pages) NXP

Part #	PCF2129A

Description	Integrated RTC, TCXO and quartz crystal

PDF	69 Pages

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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1.

General description

The PCF2129A 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 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 and benefits

Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors

Typical accuracy:

±3ppm 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 400 kHz Fast-mode I2C-bus interface (IOL = 3 mA at pin

SDA/CE)

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. 02 — 7 May 2010

Product data sheet

1.

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

Similar Part No. - PCF2129A

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