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PCF2128 Datasheet(PDF) 1 Page - NXP Semiconductors

Part No. PCF2128
Description  Integrated RTC / TCXO / Crystal
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF2128 Datasheet(HTML) 1 Page - NXP Semiconductors

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General description
The PCF2128 is a ready to run CMOS real time clock/calendar with an integrated
temperature compensated crystal oscillator (TCXO). In timekeeping applications the high
accuracy of the PCF2128 allows it to be used as a replacement for costly and higher
powered long wave receivers or GPS receivers. A programmable battery switch-over
circuit enables an uninterruptible power supply and consequently continuous timekeeping.
The PCF2128 additionally features 512 bytes of general purpose RAM, a programmable
watchdog, a time stamp facility and a voltage monitoring facility. Programming is possible
using either an SPI or an I2C-bus interface.
Integrated RTC / TCXO / Crystal
Rev. 00.03 — 4 June 2007
Preliminary [short] data sheet
Integration of a 32.768 kHz quartz
crystal in the same package as the RTC
512 bytes of general purpose static
temperature compensated crystal
oscillator (TCXO) with integrated
1 second or 1 minute interrupt output
typically 3 ppm from
−20 °C to +70 °C,
typically 5 ppm from
−40 °C to +85 °C
oscillator stop detection
provides year, month, day, weekday,
hours, minutes and seconds
two line bi-directional 1 MHz fast mode
plus I2C interface
programmable alarm function with
interrupt capability
timestamp input
programmable countdown timer with
interrupt capability
power-on reset
programmable watchdog timer with
interrupt and reset capability
3 line SPI interface with separate data
input and output (maximum speed
6.5 Mbits/s)
timestamp function with interrupt
programmable square wave output pin
battery backup input pin and switch-over
I2C-bus slave address: read A3H and
write A2H
extra power fail detection with input and
output pins
clock operating voltage: <tbd> to 5.5 V
battery low detection
low backup current; typical 0.95
μA at
VDD = 3.0 V and Tamb =25
battery backed output voltage pin
selectable I2C and SPI interface

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