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PDF DS3231 Fiche technique ( Data sheet )

Numéro de référence DS3231
Description Extremely Accurate I2C-Integrated RTC/TCXO/Crystal
Fabricant Maxim Integrated 
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DS3231 Datasheet, Description
DS3231
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
accurate timekeeping when main power to the device
is interrupted. 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 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 μP reset.
Typical Operating Circuit
VCC
VCC RPU = tR/CB
RPU RPU
SCL
SDA
P
RST
PUSHBUTTON
RESET
SCL
SDA
RST
N.C.
N.C.
N.C.
N.C.
Benefits and Features
● Highly Accurate RTC Completely Manages All
Timekeeping Functions
• Real-Time Clock Counts Seconds, Minutes, Hours,
Date of the Month, Month, Day of the Week, and
Year, with Leap-Year Compensation Valid Up to 2100
• Accuracy ±2ppm from 0°C to +40°C
• Accuracy ±3.5ppm from -40°C to +85°C
• Digital Temp Sensor Output: ±3°C Accuracy
• Register for Aging Trim
RST Output/Pushbutton Reset Debounce Input
• Two Time-of-Day Alarms
• Programmable Square-Wave Output Signal
● Simple Serial Interface Connects to Most
Microcontrollers
• Fast (400kHz) I2C Interface
● Battery-Backup Input for Continuous Timekeeping
• Low Power Operation Extends Battery-Backup
Run Time
• 3.3V Operation
● Operating Temperature Ranges: Commercial
(0°C to +70°C) and Industrial (-40°C to +85°C)
● Underwriters Laboratories® (UL) Recognized
Applications
● Servers
● Telematics
● Utility Power Meters
● GPS
Ordering Information and Pin Configuration appear at end of data
sheet.
VCC
VCC
INT/SQW
32kHz
DS3231
GND
VBAT
N.C.
N.C.
N.C.
N.C.
Underwriters Laboratories is a registered certification mark of
Underwriters Laboratories Inc.
19-5170; Rev 10; 3/15
DS3231 Fiche technique
DS3231
Extremely Accurate I2C-Integrated
RTC/TCXO/Crystal
Electrical Characteristics (continued)
(VCC = 2.3V to 5.5V, VCC = Active Supply (see Table 1), 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 2, 3)
PARAMETER
Output Frequency
Frequency Stability vs.
Temperature (Commercial)
SYMBOL
CONDITIONS
fOUT VCC = 3.3V or VBAT = 3.3V
MIN TYP MAX UNITS
32.768
kHz
Δf/fOUT
VCC = 3.3V or
VBAT = 3.3V,
aging offset = 00h
0°C to +40°C
>40°C to +70°C
±2
±3.5
ppm
Frequency Stability vs.
Temperature (Industrial)
Frequency Stability vs. Voltage
Trim Register Frequency
Sensitivity per LSB
Temperature Accuracy
Crystal Aging
Δf/fOUT
Δf/V
Δf/LSB
Temp
Δf/fO
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
-40°C
Specified at:
+25°C
+70°C
+85°C
VCC = 3.3V or VBAT = 3.3V
After reflow,
First year
not production tested
0–10 years
-3
1
0.7
0.1
0.4
0.8
±1.0
±5.0
±3.5
±2
±3.5
ppm
ppm/V
ppm
+3 °C
ppm
Electrical Characteristics
(VCC = 0V, VBAT = 2.3V to 5.5V, TA = TMIN to TMAX, unless otherwise noted.) (Note 2)
PARAMETER
Active Battery Current
Timekeeping Battery Current
SYMBOL
IBATA
IBATT
CONDITIONS
EOSC = 0, BBSQW = 0,
SCL = 400kHz (Note 5)
VBAT = 3.63V
VBAT = 5.5V
EOSC = 0, BBSQW = 0,
EN32kHz = 1,
SCL = SDA = 0V or
SCL = SDA = VBAT (Note 5)
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
0.84
1.0
MAX
70
150
3.0
3.5
UNITS
µA
µA
575
µA
650
100 nA
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3 Page

DS3231 pdf
DS3231
Data Transfer on I2C Serial Bus
Extremely Accurate I2C-Integrated
RTC/TCXO/Crystal
SDA
tBUF
SCL
STOP
START
tLOW
tHD:STA
tR tF
tHD:STA
tHD:DAT
tHIGH
tSU:DAT
tSU:STA
REPEATED
START
tSP
tSU:STO
WARNING: Negative undershoots below -0.3V while the part is in battery-backed mode may cause loss of data.
Note 2: Limits at -40°C are guaranteed by design and not production tested.
Note 3: All voltages are referenced to ground.
Note 4: ICCA—SCL clocking at max frequency = 400kHz.
Note 5: Current is the averaged input current, which includes the temperature conversion current.
Note 6: The RST pin has an internal 50kΩ (nominal) pullup resistor to VCC.
Note 7: After this period, the first clock pulse is generated.
Note 8: A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the VIH(MIN) of the SCL sig-
nal) to bridge the undefined region of the falling edge of SCL.
Note 9: The maximum tHD:DAT needs only to be met if the device does not stretch the low period (tLOW) of the SCL signal.
Note 10: 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 11: CB—total capacitance of one bus line in pF.
Note 12: 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 13: This delay applies only if the oscillator is enabled and running. If the EOSC bit is a 1, tREC is bypassed and RST immedi-
ately goes high. The state of RST does not affect the I2C interface, RTC, or TCXO.
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