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PCF2128T Datasheet

  • PCF2128T

  • Integrated RTC / TCXO / Crystal

  • 10頁

  • PHILIPS

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PCF2128
Integrated RTC / TCXO / Crystal
Rev. 00.03 鈥?4 June 2007
Preliminary [short] data sheet
1. 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 I
2
C-bus interface.
2. Features
Integration of a 32.768 kHz quartz
crystal in the same package as the RTC
temperature compensated crystal
oscillator (TCXO) with integrated
capacitors.
accuracy:
typically 3 ppm from鈭?0
擄C
to
+70 擄C,
typically 5 ppm from
鈭?0 擄C
to
+85 擄C
provides year, month, day, weekday,
hours, minutes and seconds
programmable alarm function with
interrupt capability
programmable countdown timer with
interrupt capability
programmable watchdog timer with
interrupt and reset capability
timestamp function with interrupt
capability
battery backup input pin and switch-over
circuitry
extra power fail detection with input and
output pins
battery low detection
battery backed output voltage pin
512 bytes of general purpose static
RAM
1 second or 1 minute interrupt output
oscillator stop detection
two line bi-directional 1 MHz fast mode
plus I
2
C interface
timestamp input
power-on reset
3 line SPI interface with separate data
input and output (maximum speed
6.5 Mbits/s)
programmable square wave output pin
I
2
C-bus slave address: read A3H and
write A2H
clock operating voltage: <tbd> to 5.5 V
low backup current; typical 0.95
渭A
at
V
DD
= 3.0 V and T
amb
= 25
擄C
selectable I
2
C and SPI interface

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