DS3231M
±±55pm, C,Real-Tipe,Clock
2
,,,,,,,,,,,,,,,,,,,,, ,General,Descri5tion
The DS3231M is a low-cost, extremely accurate, I C
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, , Features
S Timekeeping Accuracy ±±ppm ꢀ±(ꢁ0.4 2ecꢂnoꢃ
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.
Day) frꢂm -0±°C tꢂ +8±°C
S Battery Backup fꢂr Cꢂntinuꢂus Timekeeping
S Lꢂw Pꢂwer Cꢂnsumptiꢂn
S Fꢂꢂtprint ano Functiꢂnally Cꢂmpatible tꢂ D2.4.1
S Cꢂmplete Clꢂck Calenoar Functiꢂnality Incluoing
2ecꢂnos, Minutes, Hꢂurs, Day, Date, Mꢂnth, ano
Year with Leap Year Cꢂmpensatiꢂn Up tꢂ Year
41((
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 Twꢂ Time-ꢂf-Day Alarms
S 1Hz ano .4ꢁ768kHz Outputs
S Reset Output ano Pushbuttꢂn Input with
Debꢂunce
4
S Fast ꢀ0((kHz) I C-Cꢂmpatible 2erial Bus
2
data are transferred serially through an I C bidirectional
S +4ꢁ.V tꢂ +±ꢁ±V 2upply Vꢂltage
bus. A precision temperature-compensated voltage
reference and comparator circuit monitors the status of
S Digital Temp 2ensꢂr with ±.°C Accuracy
S -0±°C tꢂ +8±°C Temperature Range
S 8-Pin ꢂr 16-Pin 2O Packages
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.
S Unoerwriters Labꢂratꢂries ꢀUL) Recꢂgnizeo
,,,,,,,,,, ,,,,Ty5ical,O5erating,Circuit
,,,,, ,,,,,,, , ,,,,,,,,,,,,,,,,,, , A55lications
Power Meters
+3.3V
+3.3V
Industrial Applications
,,,,,, , ,,,,, , ,,, ,Ordering, nforpation
SCL
PART
TEMP RANGE
-45NC to +85NC
-45NC to +85NC
-45NC to +85NC
PIN-PACKAGE
8 SO
I/O PORT
SDA
DS3231MZ+
DS3231MZ/V+
DS3231M+
32KHZ
V
BAT
8 SO
INT/SQW
RST
INTERRUPTS
CPU
16 SO
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
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.maximintegrated.com/errata.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5312; Rev 4; 9/12
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