DS3231MZ 查看數據表（PDF） - Maxim Integrated

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DS3231MZ

±5ppm, I2C Real-Time Clock

Maxim Integrated 

±5ppm, I2C Real-Time Clock

PIN

8 SO 16 SO

7

15

8

16

NAME

SDA

SCL

Pin Description (continued)

FUNCTION

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 volt-

age on VCC.

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.

Block Diagram

DS3231M

DIVIDER

32KHZ

N

VBAT

TIME-BASE

VCC

RESONATOR

POWER

RPU

CONTROL

RST

N

TEMP

SENSOR

GND

INT/SQW

1Hz INTERRUPT

OR 1Hz

N

SELECT

DIGITAL

ADJUSTMENT

FACTORY TRIM

SDA

I2C

CONTROL AND STATUS

CLOCK/CALENDAR

SCL

INTERFACE

REGISTERS

WITH ALARM

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 -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 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.

8

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