Rainbow-electronics DS3231 Manual de usuario descargar pdf

General Description

The DS3231 is a low-cost, extremely accurate I

C real-

time clock (RTC) with an integrated temperature-

compensated crystal oscillator (TCXO) and crystal. The

device incorporates a battery input, and maintains accu-

rate timekeeping when main power to the device is inter-

rupted. The integration of the crystal resonator enhances

the long-term accuracy of the device as well as reduces

the piece-part count in a manufacturing line. The DS3231

is available in commercial and industrial temperature

ranges, and is offered in a 16-pin, 300-mil SO package.

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 programmable square-wave output

are provided. Address and data are transferred serially

through an I

C bidirectional bus.

A precision temperature-compensated voltage refer-

ence and comparator circuit monitors the status of V

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

to automatically switch to the backup supply when nec-

essary. Additionally, the RST pin is monitored as a

pushbutton input for generating a reset externally.

Applications

Servers Utility Power Meters

Telematics GPS

Features

♦ Accuracy ±2ppm from 0°C to +40°C

♦ Accuracy ±3.5ppm from -40°C to +85°C

♦ Battery Backup Input for Continuous

Timekeeping

♦ Operating Temperature Ranges

Commercial: 0°C to +70°C

Industrial: -40°C to +85°C

♦ Low-Power Consumption

♦ Real-Time Clock Counts Seconds, Minutes,

Hours, Day, Date, Month, and Year with Leap Year

Compensation Valid Up to 2100

♦ Two Time-of-Day Alarms

♦ Programmable Square-Wave Output

♦ Fast (400kHz) I

C Interface

♦ 3.3V Operation

♦ Digital Temp Sensor Output: ±3°C Accuracy

♦ Register for Aging Trim

♦ RST Input/Output

♦ UL Recognized

DS3231

Extremely Accurate I

C-Integrated

RTC/TCXO/Crystal

______________________________________________ Maxim Integrated Products 1

Rev 2; 6/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

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

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

TOP

MARK

DS3231S

0°C to +70°C

16 SO

DS3231

DS3231SN

-40°C to +85°C

16 SO

DS3231N

DS3231S+

0°C to +70°C

16 SO

DS3231+

DS3231SN+

-40°C to +85°C

16 SO

DS3231N+

Pin Configuration appears at end of data sheet.

Purchase of I

C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a

license under the Philips I

C Patent Rights to use these components in an I

C system, provided that the system conforms to the I

Standard Specification as defined by Philips.

DS3231

SCL

= t

INT/SQW

32kHz

BAT

PUSHBUTTON

RESET

SDA

RST

N.C.

GND

CPU

N.C.

Typical Operating Circuit

+Denotes lead-free

1 2 3 4 5 6 ... 18 19

Indice de contenidos

Pagina 1 - RTC/TCXO/Crystal

General DescriptionThe DS3231 is a low-cost, extremely accurate I2C real-time clock (RTC) with an integrated temperature-compensated crystal oscillato

Pagina 2

DS3231OperationThe block diagram shows the main elements of theDS3231. The eight blocks can be grouped into fourfunctional groups: TCXO, power control

Pagina 3

DS3231 I2C interface may be placed into a known stateby toggling SCL until SDA is observed to be at a highlevel. At that point the microcontroller sho

Pagina 4

DS3231The countdown chain is reset whenever the secondsregister is written. Write transfers occur on the acknowl-edge from the DS3231. Once the countd

Pagina 5

Special-Purpose RegistersThe DS3231 has two additional registers (control andstatus) that control the real-time clock, alarms, andsquare-wave output.C

Pagina 6

DS3231Status Register (0Fh)Bit 7: Oscillator Stop Flag (OSF). A logic 1 in this bitindicates that the oscillator either is stopped or wasstopped for s

Pagina 7

Temperature Registers (11h–12h)Temperature is represented as a 10-bit code with a res-olution of +0.25°C and is accessible at location 11hand 12h. The

Pagina 8

DS3231Figures 3 and 4 detail how data transfer is accom-plished on the I2C bus. Depending upon the state ofthe R/W bit, two types of data transfer are

Pagina 9

acknowledge on SDA. After the DS3231 acknowl-edges the slave address + write bit, the mastertransmits a word address to the DS3231. This setsthe regis

Pagina 10

DS3231Extremely Accurate I2C-IntegratedRTC/TCXO/Crystal18 ____________________________________________________________________Chip InformationTRANSIST

Pagina 11

DS3231Extremely Accurate I2C-IntegratedRTC/TCXO/CrystalMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embod

Pagina 12

DS3231Extremely Accurate I2C-IntegratedRTC/TCXO/Crystal2 _____________________________________________________________________ABSOLUTE MAXIMUM RATINGS

Pagina 13

DS3231Extremely Accurate I2C-IntegratedRTC/TCXO/Crystal_____________________________________________________________________ 3ELECTRICAL CHARACTERISTI

Pagina 14

DS3231Extremely Accurate I2C-IntegratedRTC/TCXO/Crystal4 _____________________________________________________________________AC ELECTRICAL CHARACTERI

Pagina 15

DS3231Extremely Accurate I2C-IntegratedRTC/TCXO/Crystal_____________________________________________________________________ 5Pushbutton Reset Timingt

Pagina 16

DS3231Extremely Accurate I2C-IntegratedRTC/TCXO/Crystal6 _____________________________________________________________________Data Transfer on I2C Ser

Pagina 17

DS3231Extremely Accurate I2C-IntegratedRTC/TCXO/Crystal_____________________________________________________________________ 7STANDBY SUPPLY CURRENTvs

Pagina 18

DS3231Extremely Accurate I2C-IntegratedRTC/TCXO/Crystal8 _____________________________________________________________________Block DiagramNNNRSTVCC32

Pagina 19

DS3231Extremely Accurate I2C-IntegratedRTC/TCXO/Crystal_____________________________________________________________________ 9Pin DescriptionPIN NAMEF

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Indice de contenidos

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