DS3232MZ+【PDF 23/23 页】IC RTC W/SRAM I2C 8SOIC

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DS3232M

±5ppm, I2C Real-Time Clock with SRAM

Maxim Integrated

Detailed Description

The DS3232M is a serial real-time clock (RTC) driven by

an internal, temperature-compensated, microelectrome-

chanical systems (MEMS) resonator. The oscillator pro-

vides a stable and accurate reference clock and main-

tains the RTC to within Q0.432 seconds-per-day accu-

racy from -40NC to +85NC. The RTC is a low-power clock/

calendar with two programmable time-of-day alarms. INT/

SQW provides either an interrupt signal due to alarm

conditions or a 1Hz square wave. The clock/calendar

provides seconds, minutes, hours, day, date, month, and

year information. The date at the end of the month is auto-

matically adjusted for months with fewer than 31 days,

including corrections for leap year. The clock operates in

either the 24-hour or 12-hour format with an AM/PM indi-

cator. The internal registers are accessible though an I2C

bus interface. A temperature-compensated voltage refer-

ence and comparator circuit monitors the level of VCC to

detect power failures and to automatically switch to the

backup supply when necessary. The RST pin provides

an external pushbutton function and acts as an indica-

tor of a power-fail event. Also available are 236 bytes of

general-purpose battery-backed SRAM.

Operation

The Block Diagram shows the device’s main elements.

Each of the major blocks is described separately in the

following sections.

Block Diagram

DS3232M

TIME-BASE

RESONATOR

TEMP

SENSOR

INTERRUPT

OR 1Hz

SELECT

DIVIDER

INT/SQW

1Hz

DIGITAL

ADJUSTMENT

FACTORY TRIM

32KHZ

GND

SDA

SCL

VBAT

VCC

RST

CLOCK/CALENDAR

WITH ALARM

CONTROL AND STATUS

REGISTERS

SRAM

I2C

INTERFACE

POWER

CONTROL*

*SELECTED

POWER

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