Datasheet > PCF2128T

PCF2128T

更新时间： 2024-11-20 04:10:59

品牌	Logo	应用领域
恩智浦 - NXP		晶体石英晶振温度补偿晶振
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10页	324K
描述
Integrated RTC / TCXO / Crystal

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PCF2128T 数据手册

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

oscillator (TCXO) with integrated

capacitors.

1 second or 1 minute interrupt output

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

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

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

_DD= 3.0 V and T_amb= 25 °C

selectable I²C and SPI interface

battery backed output voltage pin

12 3 4 5 6 7...10

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