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PDF DS3231 Fiche technique - Dallas Semiconductor

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



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DS3231 Datasheet, Description
www.DataSheet4U.com
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.
DS3231 Fiche technique
Extremely Accurate I2C-Integrated
RTC/TCXO/Crystal
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 2.3V to 5.5V, VCC > VBAT, TA = TMIN to TMAX, unless otherwise noted.) (Typical values are at VCC = 3.3V, VBAT = 3.0V, and
TA = +25°C, unless otherwise noted.) (Notes 1, 2)
PARAMETER
Output Frequency
Frequency Stability vs.
Temperature (Commercial)
SYMBOL
CONDITIONS
fOUT VCC = 3.3V or VBAT = 3.3V
f/fOUT
VCC = 3.3V or
VBAT = 3.3V,
aging offset = 00h
0°C to +40°C
>40°C to +70°C
MIN TYP MAX UNITS
32.768
kHz
±2
±3.5
ppm
Frequency Stability vs.
Temperature (Industrial)
Frequency Stability vs. Voltage
Trim Register Frequency
Sensitivity per LSB
Temperature Accuracy
Crystal Aging
f/fOUT
VCC = 3.3V or
VBAT = 3.3V,
aging offset = 00h
-40°C to <0°C
0°C to +40°C
>40°C to +85°C
±3.5
±2
±3.5
ppm
f/V 1 ppm/V
-40°C
0.7
f/LSB Specified at:
+25°C
+70°C
0.1
ppm
0.4
+85°C
0.8
Temp
f/f0
VCC = 3.3V or VBAT = 3.3V
After reflow,
First year
not production tested
0–10 years
-3 +3 °C
±1.0
±5.0
ppm
ELECTRICAL CHARACTERISTICS
(VCC = 0V, VBAT = 2.3V to 5.5V, TA = TMIN to TMAX, unless otherw.ise noted.) (Note 1)
PARAMETER
Active Battery Current
Timekeeping Battery Current
SYMBOL
IBATA
IBATT
CONDITIONS
EOSC = 0, BBSQW = 0,
SCL = 400kHz (Note 4)
VBAT = 3.63V
VBAT = 5.5V
EOSC = 0, BBSQW = 0,
EN32kHz = 1,
SCL = SDA = 0V or
SCL = SDA = VBAT (Note 4)
VBAT = 3.63V
VBAT = 5.5V
Temperature Conversion Current
Data-Retention Current
IBATTC
IBATTDR
EOSC = 0, BBSQW = 0,
SCL = SDA = 0V or
SCL = SDA = VBAT
VBAT = 3.63V
VBAT = 5.5V
EOSC = 1, SCL = SDA = 0V, +25°C
MIN TYP MAX UNITS
70
µA
150
0.84 3.0
1.0 3.5
µA
575
µA
650
100 nA
_____________________________________________________________________ 3

3 Page

DS3231 pdf
Extremely Accurate I2C-Integrated
RTC/TCXO/Crystal
Data Transfer on I2C Serial Bus
SDA
tBUF
SCL
STOP
START
tLOW
tHD:STA
tR tF
tHD:STA
tHD:DAT
tHIGH
tSU:DAT
tSU:STA
REPEATED
START
tSP
tSU:STO
Note 1: Limits at -40°C are guaranteed by design and not production tested.
Note 2: All voltages are referenced to ground.
Note 3: ICCA—SCL clocking at max frequency = 400kHz.
Note 4: Current is the averaged input current, which includes the temperature conversion current.
Note 5: The RST pin has an internal 50k(nominal) pullup resistor to VCC.
Note 6: After this period, the first clock pulse is generated.
Note 7: A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the VIH(MIN) of the SCL signal)
to bridge the undefined region of the falling edge of SCL.
Note 8: The maximum tHD:DAT needs only to be met if the device does not stretch the low period (tLOW) of the SCL signal.
Note 9: A fast-mode device can be used in a standard-mode system, but the requirement tSU:DAT 250ns must then be met. This
is automatically the case if the device does not stretch the low period of the SCL signal. If such a device does stretch the
low period of the SCL signal, it must output the next data bit to the SDA line tR(MAX) + tSU:DAT = 1000 + 250 = 1250ns
before the SCL line is released.
Note 10: CB—total capacitance of one bus line in pF.
Note 11: The parameter tOSF is the period of time the oscillator must be stopped for the OSF flag to be set over the voltage range of
0.0V VCC VCC(MAX) and 2.3V VBAT 3.4V.
Note 12: This delay applies only if the oscillator is enabled and running. If the EOSC bit is a 1, the startup time of the oscillator is
added to this delay.
6 _____________________________________________________________________

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