DS3231MZ+【PDF 1/20 页】IC RTC I2C 8SOIC

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±5ppm, I2C Real-Time Clock

DS3231M

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

19-5312; Rev 5; 7/13

+Denotes a lead(Pb)-free/RoHS-compliant package.

/V denotes an automotive qualified part.

Typical Operating Circuit

General Description

The DS3231M is a low-cost, extremely accurate, I2C

real-time clock (RTC). The device incorporates a battery

input and maintains accurate timekeeping when main

power to the device is interrupted. The integration of

the microelectromechanical systems (MEMS) resona-

tor enhances the long-term accuracy of the device and

reduces the piece-part count in a manufacturing line.

The DS3231M is available in the same footprint as the

popular DS3231 RTC.

The RTC maintains 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. Two programmable time-of-

day alarms and a 1Hz output are provided. Address and

data are transferred serially through an I2C bidirectional

bus. A precision temperature-compensated voltage

reference and comparator circuit monitors the status of

VCC to detect power failures, to provide a reset output,

and to automatically switch to the backup supply when

necessary. Additionally, the RST pin is monitored as a

pushbutton input for generating a microprocessor reset.

See the Block Diagram for more details.

Applications

Power Meters

Industrial Applications

Ordering Information

Features

Timekeeping Accuracy ±5ppm (±0.432 Second/

Day) from -45°C to +85°C

Battery Backup for Continuous Timekeeping

Low Power Consumption

Footprint and Functionally Compatible to DS3231

Complete Clock Calendar Functionality Including

Seconds, Minutes, Hours, Day, Date, Month, and

Year with Leap Year Compensation Up to Year

2100

Two Time-of-Day Alarms

1Hz and 32.768kHz Outputs

Reset Output and Pushbutton Input with

Debounce

Fast (400kHz) I2C-Compatible Serial Bus

+2.3V to +5.5V Supply Voltage

Digital Temp Sensor with ±3°C Accuracy

-45°C to +85°C Temperature Range

8-Pin or 16-Pin SO Packages

Underwriters Laboratories (UL) Recognized

DS3231M

SCL

SDA

32KHZ

VBAT

INT/SQW

RST

+3.3V

CPU

I/O PORT

INTERRUPTS

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

may be simultaneously available through various sales channels. For information about device errata, go to: www.maximintegrated.com/errata.

PART

TEMP RANGE

PIN-PACKAGE

DS3231MZ+

-45NC to +85NC

8 SO

DS3231MZ/V+

-45NC to +85NC

8 SO

DS3231M+

-45NC to +85NC

16 SO

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