DS3231MZ+【PDF 19/20 页】IC RTC I2C 8SOIC

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Sheet目录1994

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±5ppm, I2C Real-Time Clock

Maxim Integrated

DS3231M

Detailed Description

The DS3231M 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 -45NC 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 automatically 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 indicator. The internal registers are accessible

though an I2C bus interface. A temperature-compensat-

ed voltage reference 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 indicator of a power-fail event.

Operation

The Block Diagram shows the device’s main elements.

Each of the major blocks is described separately in the

following sections.

Block Diagram

Pin Description (continued)

DS3231M

TIME-BASE

RESONATOR

TEMP

SENSOR

INTERRUPT

OR 1Hz

SELECT

DIVIDER

INT/SQW

1Hz

DIGITAL

ADJUSTMENT

FACTORY TRIM

32KHZ

SDA

GND

SCL

VBAT

VCC

RST

RPU

CLOCK/CALENDAR

WITH ALARM

CONTROL AND STATUS

REGISTERS

I2C

INTERFACE

POWER

CONTROL

NAME

FUNCTION

8 SO

16 SO

SDA

Serial-Data Input/Output. This pin is the data input/output for the I2C serial interface. This open-drain

pin requires an external pullup resistor. The pullup voltage can be up to 5.5V, regardless of the

voltage on VCC.

SCL

Serial-Clock Input. This pin is the clock input for the I2C serial interface and is used to synchronize

data movement on the serial interface. The pullup voltage can be up to 5.5V, regardless of the

voltage on VCC.

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