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Dallas Semiconductor - Extremely Accurate I2C-Integrated RTC/TXO/Crystal

Numéro de référence DS3231
Description Extremely Accurate I2C-Integrated RTC/TXO/Crystal
Fabricant Dallas Semiconductor 
Logo Dallas Semiconductor 





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DS3231 fiche technique
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Rev 2; 6/05
Extremely Accurate I2C-Integrated
RTC/TCXO/Crystal
General Description
The DS3231 is a low-cost, extremely accurate I2C 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 I2C bidirectional bus.
A precision temperature-compensated voltage refer-
ence 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 nec-
essary. Additionally, the RST pin is monitored as a
pushbutton input for generating a reset externally.
Applications
Servers
Telematics
Utility Power Meters
GPS
Pin Configuration appears at end of data sheet.
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) I2C Interface
3.3V Operation
Digital Temp Sensor Output: ±3°C Accuracy
Register for Aging Trim
RST Input/Output
UL Recognized
Ordering Information
PART
TEMP RANGE
DS3231S
0°C to +70°C
DS3231SN -40°C to +85°C
DS3231S+
0°C to +70°C
DS3231SN+ -40°C to +85°C
+Denotes lead-free
PIN-PACKAGE
16 SO
16 SO
16 SO
16 SO
TOP
MARK
DS3231
DS3231N
DS3231+
DS3231N+
Typical Operating Circuit
VCC VCC
VCC RPU = tR/CB
RPU RPU
SCL
VCC
INT/SQW
CPU
PUSHBUTTON
RESET
SDA DS3231 32kHz
RST VBAT
N.C.
N.C.
N.C.
N.C. GND
N.C.
N.C.
N.C.
N.C.
Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a
license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C
Standard Specification as defined by Philips.
______________________________________________ Maxim Integrated Products 1
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.

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