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Maxim Integrated Semiconductor Electronic Components Datasheet

DS3231 Datasheet

Extremely Accurate I2C-Integrated RTC/TCXO/Crystal

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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


Maxim Integrated Semiconductor Electronic Components Datasheet

DS3231 Datasheet

Extremely Accurate I2C-Integrated RTC/TCXO/Crystal

No Preview Available !

DS3231
Extremely Accurate I2C-Integrated
RTC/TCXO/Crystal
Absolute Maximum Ratings
Voltage Range on Any Pin Relative to Ground.....-0.3V to +6.0V
Junction-to-Ambient Thermal Resistance (θJA) (Note 1).73°C/W
Junction-to-Case Thermal Resistance (θJC) (Note 1).....23°C/W
Operating Temperature Range
DS3231S.............................................................0°C to +70°C
DS3231SN....................................................... -40°C to +85°C
Junction Temperature.......................................................+125°C
Storage Temperature Range............................... -40°C to +85°C
Lead Temperature (soldering, 10s).................................. +260°C
Soldering Temperature (reflow, 2 times max).................. +260°C
(see the Handling, PCB Layout, and Assembly section)
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Recommended Operating Conditions
(TA = TMIN to TMAX, unless otherwise noted.) (Notes 2, 3)
PARAMETER
Supply Voltage
SYMBOL
VCC
VBAT
Logic 1 Input SDA, SCL
VIH
Logic 0 Input SDA, SCL
VIL
CONDITIONS
MIN
2.3
2.3
0.7 x
VCC
-0.3
TYP
3.3
3.0
MAX
5.5
5.5
VCC +
0.3
0.3 x
VCC
UNITS
V
V
V
V
Electrical Characteristics
(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
Active Supply Current
Standby Supply Current
Temperature Conversion Current
Power-Fail Voltage
Logic 0 Output, 32kHz, INT/SQW,
SDA
Logic 0 Output, RST
Output Leakage Current 32kHz,
INT/SQW, SDA
Input Leakage SCL
RST Pin I/O Leakage
VBAT Leakage Current
(VCC Active)
SYMBOL
ICCA
ICCS
ICCSCONV
VPF
VOL
VOL
ILO
ILI
IOL
IBATLKG
(Notes 4, 5)
CONDITIONS
VCC = 3.63V
VCC = 5.5V
I2C bus inactive, 32kHz VCC = 3.63V
output on, SQW output off
(Note 5)
VCC = 5.5V
I2C bus inactive, 32kHz VCC = 3.63V
output on, SQW output off VCC = 5.5V
IOL = 3mA
IOL = 1mA
Output high impedance
RST high impedance (Note 6)
MIN
2.45
-1
-1
-200
TYP
2.575
0
25
MAX
200
300
110
170
575
650
2.70
0.4
0.4
+1
+1
+10
100
UNITS
µA
µA
µA
V
V
V
µA
µA
µA
nA
www.maximintegrated.com
Maxim Integrated 2


Part Number DS3231
Description Extremely Accurate I2C-Integrated RTC/TCXO/Crystal
Maker Maxim Integrated
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DS3231 Datasheet PDF






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