DS3234(2006) 查看數據表（PDF） - Maxim Integrated

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DS3234
(Rev.:2006)

Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM

Maxim Integrated 

Extremely Accurate SPI Bus RTC with

Integrated Crystal and SRAM

Block Diagram

VCC

X1

OSCILLATOR AND

CAPACITOR ARRAY

X2

CONTROL LOGIC/

DIVIDER

DS3234

VCC

VBAT

POWER CONTROL

TEMPERATURE

SENSOR

GND

PUSHBUTTON RESET;

SQUARE-WAVE BUFFER;

INT/SQW CONTROL

CONTROL AND STATUS

REGISTERS

RST

N

32kHz

INT/SQW

N

CS

SCLK

SCLK

DIN

DOUT

SPI INTERFACE AND

ADDRESS REGISTER

DECODE

SRAM

CLOCK AND CALENDAR

REGISTERS

USER BUFFER

(7 BYTES)

Detailed Description

The DS3234 is a TCXO and RTC with integrated crystal

and 256 bytes of SRAM. An integrated sensor periodi-

cally samples the temperature and adjusts the oscillator

load to compensate for crystal drift caused by tempera-

ture variations. The DS3234 provides user-selectable

sample rates. This allows the user to select a tempera-

ture sensor sample rate that allows for various tempera-

ture rates of change, while minimizing current

consumption by temperature sensor sampling. The user

should select a sample rate based upon the expected

temperature rate of change, with faster sample rates for

applications where the ambient temperature changes

significantly over a short time. The TCXO provides a sta-

ble and accurate reference clock, and maintains the

RTC to within ±2 minutes per year accuracy from -40°C

to +85°C. The TCXO frequency output is available at the

32kHz pin. The RTC is a low-power clock/calendar with

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