DS3234 데이터 시트보기 (PDF) - Maxim Integrated

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DS3234

Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM

Maxim Integrated 

DS3234

Extremely Accurate SPI Bus RTC

with Integrated Crystal and SRAM

Block Diagram

X1

OSCILLATOR AND

CAPACITOR ARRAY

X2

CONTROL LOGIC/

DIVIDER

DS3234

VCC

VBAT

POWER CONTROL

TEMPERATURE

SENSOR

GND

CS

SCLK

SCLK

DIN

DOUT

SPI INTERFACE AND

ADDRESS REGISTER

DECODE

SQUARE-WAVE BUFFER;

INT/SQW CONTROL

32kHz

INT/SQW

N

VCC

VOLTAGE REFERENCE;

DEBOUNCE CIRCUIT;

PUSHBUTTON RESET

RST

N

CONTROL AND STATUS

REGISTERS

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 oscilla-

tor load to compensate for crystal drift caused by

temperature variations. The DS3234 provides user-

selectable sample rates. This allows the user to select

a temperature sensor sample rate that allows for vari-

ous temperature rates of change, while minimizing cur-

rent consumption by temperature sensor sampling. The

user should select a sample rate based upon the

expected temperature rate of change, with faster sam-

ple rates for applications where the ambient tempera-

ture changes significantly over a short time. The TCXO

provides a stable and accurate reference clock, and

maintains the RTC to within ±2 minutes per year accu-

racy 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 two programmable time-of-day

alarms and a programmable square-wave output. The

INT/SQW provides either an interrupt signal due to

alarm conditions or a square-wave output. The

clock/calendar provides seconds, minutes, hours, day,

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