PCF2128T 데이터 시트보기 (PDF) - Philips Electronics

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PCF2128T

Integrated RTC / TCXO / Crystal

Philips Electronics 

PCF2128

Integrated RTC / TCXO / Crystal

Rev. 00.03 — 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 I2C-bus interface.

2. Features

„ Integration of a 32.768 kHz quartz

„ 512 bytes of general purpose static

crystal in the same package as the RTC RAM

„ temperature compensated crystal

„ 1 second or 1 minute interrupt output

oscillator (TCXO) with integrated

capacitors.

„ accuracy:

„ oscillator stop detection

typically 3 ppm from−20 °C to +70 °C,

typically 5 ppm from −40 °C to +85 °C

„ provides year, month, day, weekday, „ two line bi-directional 1 MHz fast mode

hours, minutes and seconds

plus I2C interface

„ programmable alarm function with

„ timestamp input

interrupt capability

„ programmable countdown timer with „ power-on reset

interrupt capability

„ programmable watchdog timer with

„ 3 line SPI interface with separate data

interrupt and reset capability

input and output (maximum speed

6.5 Mbits/s)

„ timestamp function with interrupt

„ programmable square wave output pin

capability

„ battery backup input pin and switch-over „ I2C-bus slave address: read A3H and

circuitry

write A2H

„ extra power fail detection with input and „ clock operating voltage: <tbd> to 5.5 V

output pins

„ battery low detection

„ low backup current; typical 0.95 μA at

„ battery backed output voltage pin

VDD = 3.0 V and Tamb = 25 °C

„ selectable I2C and SPI interface

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