DS3231S+ DALLAS [Dallas Semiconductor], DS3231S+ Datasheet

DS3231S+

Manufacturer Part Number

DS3231S+

Description

Extremely Accurate I2C-Integrated RTC/TXO/Crystal

Manufacturer

DALLAS [Dallas Semiconductor]

Datasheet

1.DS3231S.pdf (19 pages)

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The DS3231 is a low-cost, extremely accurate I

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

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.

Rev 2; 6/05

Pin Configuration appears at end of data sheet.

Purchase of I

license under the Philips I

Standard Specification as defined by Philips.

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.

Servers

Telematics

C bidirectional bus.

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

CPU

General Description

C Patent Rights to use these components in an I

PUSHBUTTON

Utility Power Meters

GPS

Extremely Accurate I

RESET

Applications

______________________________________________ Maxim Integrated Products

= t

C real-

SCL

SDA

RST

N.C.

DS3231

♦ Accuracy ±2ppm from 0°C to +40°C

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

♦ Battery Backup Input for Continuous

♦ Operating Temperature Ranges

♦ Low-Power Consumption

♦ Real-Time Clock Counts Seconds, Minutes,

♦ Two Time-of-Day Alarms

♦ Programmable Square-Wave Output

♦ Fast (400kHz) I

♦ 3.3V Operation

♦ Digital Temp Sensor Output: ±3°C Accuracy

♦ Register for Aging Trim

♦ RST Input/Output

♦ UL Recognized

+Denotes lead-free

DS3231S

DS3231SN

DS3231S+

DS3231SN+

GND

Timekeeping

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

Compensation Valid Up to 2100

PART

Commercial: 0°C to +70°C

Industrial: -40°C to +85°C

INT/SQW

C system, provided that the system conforms to the I

32kHz

N.C.

BAT

RTC/TCXO/Crystal

-40°C to +85°C

TEMP RANGE

Typical Operating Circuit

0°C to +70°C

C Interface

Ordering Information

C-Integrated

PIN-PACKAGE

16 SO

Features

DS3231N+

DS3231N

DS3231+

DS3231

MARK

TOP

Related parts for DS3231S+

DS3231S+ Summary of contents

Page 1

... Two Time-of-Day Alarms ♦ Programmable Square-Wave Output ♦ Fast (400kHz) I ♦ 3.3V Operation ♦ Digital Temp Sensor Output: ±3°C Accuracy ♦ Register for Aging Trim ♦ RST Input/Output ♦ UL Recognized CC PART DS3231S Applications DS3231SN DS3231S+ DS3231SN+ +Denotes lead-free ...

Page 2

Extremely Accurate I RTC/TCXO/Crystal ABSOLUTE MAXIMUM RATINGS , 32kHz, SCL, SDA, RST, Voltage Range BAT INT/SQW Relative to Ground.............................-0.3V to +6.0V Operating Temperature Range (noncondensing) .............................................-40°C to +85°C Junction Temperature ......................................................+125°C Stresses beyond those listed ...

Page 3

Extremely Accurate I ELECTRICAL CHARACTERISTICS (continued 2.3V to 5.5V, V > BAT +25°C, unless otherwise noted.) (Notes PARAMETER SYMBOL Output Frequency Frequency Stability vs. Temperature ...

Page 4

Extremely Accurate I RTC/TCXO/Crystal AC ELECTRICAL CHARACTERISTICS ( CC(MIN) CC(MAX) BAT PARAMETER SYMBOL SCL Clock Frequency Bus Free Time Between STOP and START Conditions Hold Time (Repeated) START t HD:STA Condition ...

Page 5

Extremely Accurate I RST PF(MAX PF(MIN) t VCCF RST _____________________________________________________________________ 2 C-Integrated RTC/TCXO/Crystal Pushbutton Reset Timing t RST Power-Switch Timing VCCR t REC 5 ...

Page 6

Extremely Accurate I RTC/TCXO/Crystal SDA t BUF t LOW SCL t HD:STA STOP START Note 1: Limits at -40°C are guaranteed by design and not production tested. Note 2: All voltages are referenced to ground. Note 3: I —SCL clocking ...

Page 7

Extremely Accurate +3.3V +25°C, unless otherwise noted STANDBY SUPPLY CURRENT vs. SUPPLY VOLTAGE 150 RST ACTIVE 100 50 0 2.0 3.0 4.0 V (V) CC SUPPLY CURRENT vs. TEMPERATURE 1.000 0.900 0.800 0.700 ...

Page 8

Extremely Accurate I RTC/TCXO/Crystal X1 OSCILLATOR AND CAPACITOR ARRAY BAT POWER CONTROL GND SCL INTERFACE AND ADDRESS REGISTER DECODE SDA 8 _____________________________________________________________________ 2 C-Integrated PUSHBUTTON RESET; CONTROL LOGIC/ SQUARE-WAVE BUFFER; DIVIDER INT/SQW CONTROL ...

Page 9

Extremely Accurate I PIN NAME 1 32kHz 32kHz Output. This open-drain pin requires an external pullup resistor. It may be left open if not used. DC Power Pin for Primary Power Supply. This pin should be decoupled using a 0.1µF ...

Page 10

Extremely Accurate I RTC/TCXO/Crystal The block diagram shows the main elements of the DS3231. The eight blocks can be grouped into four functional groups: TCXO, power control, pushbutton function, and RTC. Their operations are described sep- arately in the following ...

Page 11

Extremely Accurate I Figure 1. Timekeeing Registers BIT 7 ADDRESS BIT 6 BIT 5 MSB 00H 0 10 Seconds 01H 0 10 Minutes AM/PM 02H 0 12/24 10 Hour 03H 0 0 04H 0 0 05H Century 0 06H 10 ...

Page 12

Extremely Accurate I RTC/TCXO/Crystal The countdown chain is reset whenever the seconds register is written. Write transfers occur on the acknowl- edge from the DS3231. Once the countdown chain is reset, to avoid rollover issues the remaining time and date ...

Page 13

Extremely Accurate I BIT 7 BIT 6 BIT 5 EOSC BBSQW CONV Special-Purpose Registers The DS3231 has two additional registers (control and status) that control the real-time clock, alarms, and square-wave output. Control Register (0Eh) Bit 7: Enable Oscillator (EOSC). ...

Page 14

Extremely Accurate I RTC/TCXO/Crystal BIT 7 BIT 6 BIT 5 OSF 0 Status Register (0Fh) Bit 7: Oscillator Stop Flag (OSF). A logic 1 in this bit indicates that the oscillator either is stopped or was stopped for some period ...

Page 15

Extremely Accurate I BIT 7 BIT 6 Sign Data BIT 7 BIT 6 Data Data 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 11h and 12h. The ...

Page 16

Extremely Accurate I RTC/TCXO/Crystal SDA MSB SLAVE ADDRESS SCL 1 2 START CONDITION 2 Figure Data Transfer Overview Figures 3 and 4 detail how data transfer is accom- 2 plished on the I C bus. Depending upon ...

Page 17

Extremely Accurate I acknowledge on SDA. After the DS3231 acknowl- edges the slave address + write bit, the master transmits a word address to the DS3231. This sets the register pointer on the DS3231, with the DS3231 acknowledging the transfer. ...

Page 18

Extremely Accurate I RTC/TCXO/Crystal Pin Configuration TOP VIEW 32kHz INT/SQW 3 RST 4 DS3231S N.C. 5 N.C. 6 N. ____________________________________________________________________ 2 C-Integrated TRANSISTOR COUNT: 33,000 SUBSTRATE CONNECTED TO GROUND PROCESS: CMOS ...

Page 19

Extremely Accurate I (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/DallasPackInfo). Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied ...

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