19-5312; Rev 1; 5/11
2
±±55pm,I C,Real-Tipe,Clock
,,,,,,,,,,,,,,,,,,,,,,General,Descri5tion
The DS3231M is a low-cost, extremely accurate, I C
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Features
S Timekeeping Accuracy Q5ppm (Q0.432 Second/
Day) from -40NC to +85NC
2
real-time clock (RTC). The device incorporates a battery
input and maintains accurate timekeeping when main
power to the device is interrupted. The integration of
the microelectromechanical systems (MEMS) resona-
tor enhances the long-term accuracy of the device and
reduces the piece-part count in a manufacturing line.
The DS3231M is available in the same footprint as the
popular DS3231 RTC.
S Battery Backup for Continuous Timekeeping
S Low Power Consumption
S Footprint and Functionally Compatible to DS3231
S Complete Clock Calendar Functionality Including
Seconds, Minutes, Hours, Day, Date, Month, and
Year with Leap Year Compensation Up to Year
2100
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 1Hz output are provided. Address and
S Two Time-of-Day Alarms
S 1Hz and 32.768kHz Outputs
S Reset Output and Pushbutton Input with
Debounce
2
S Fast (400kHz) I C-Compatible Serial Bus
2
data are transferred serially through an I C bidirectional
S +2.3V to +5.5V Supply Voltage
bus. A precision temperature-compensated voltage
reference and comparator circuit monitors the status of
S Digital Temp Sensor with Q3NC Accuracy
S -40NC to +85NC Temperature Range
S 8-Pin or 16-Pin SO (300 mils) Packages
S Underwriters Laboratories (UL) Recognized
V
to detect power failures, to provide a reset output,
CC
and to automatically switch to the backup supply when
necessary. Additionally, the RST pin is monitored as a
pushbutton input for generating a microprocessor reset.
See the Block Diagram for more details.
,,,,,,,,,,,,,,Ty5ical,O5erating,Circuit
,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,, A55lications
Power Meters
+3.3V
+3.3V
Industrial Applications
,,,,,,, ,,,,,, ,,, ,Ordering,Inforpation
SCL
PART
DS3231MZ+*
DS3231M+
TEMP RANGE
-40NC to +85NC
-40NC to +85NC
PIN-PACKAGE
8 SO
I/O PORT
SDA
32KHZ
V
BAT
16 SO
INT/SQW
RST
INTERRUPTS
CPU
+Denotes a lead(Pb)-free/RoHS-compliant package.
*Future product—contact factory for availability.
DS3231M
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, go to: www.maxim-ic.com/errata.
_______________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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