19-6247; Rev 1; 8/12
DS3232M
2
±±55pm, C,Real-Tipe,Clock,with,SRAM,
General Description
Features
2
The DS3232M is a low-cost, extremely accurate, I C
S Timekeeping Accuracy ±±ppm ꢀ±(ꢁ0.4 2ecꢂnoꢃ
real-time clock (RTC) with 236 bytes of battery-backed
SRAM. The device incorporates a battery input and
maintains accurate timekeeping when main power to the
device is interrupted. The integration of the microelec-
tromechanical systems (MEMS) resonator enhances the
long-term accuracy of the device and reduces the piece-
part count in a manufacturing line.
Day) frꢂm -0(NC tꢂ +8±NC
S 4.6 Bytes ꢂf Battery-Backeo User 2RAM
S Battery Backup fꢂr Cꢂntinuꢂus Timekeeping
S Lꢂw Pꢂwer Cꢂnsumptiꢂn
S Functiꢂnally Cꢂmpatible tꢂ D2.4.4
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 data
S Twꢂ Time-ꢂf-Day Alarms
S 1Hz ano .4ꢁ768kHz Outputs
S Reset Output ano Pushbuttꢂn Input with
2
are transferred serially through an I C bidirectional bus.
Debꢂunce
A precision temperature-compensated voltage reference
4
S Fast ꢀ0((kHz) I C-Cꢂmpatible 2erial Bus
and comparator circuit monitors the status of V
to
CC
S +4ꢁ.V tꢂ +0ꢁ±V 2upply Vꢂltage
detect power failures, to provide a reset output, and to
automatically switch to the backup supply when neces-
sary. Additionally, the RST pin is monitored as a pushbut-
ton input for generating a microprocessor reset. See the
Block Diagram for more details.
S Digital Temp 2ensꢂr with ±.NC Accuracy
S -0(NC tꢂ +8±NC Temperature Range
S 8-Pin 2O ꢀ1±( mils) Package
S Unoerwriters Labꢂratꢂries ꢀUL) Recꢂgnizeo
Applications
Typical Operating Circuit
Power Meters
Industrial Applications
V
V
CC
CC
Ordering Information appears at end of data sheet.
SCL
DS3232M
I/O PORT
SDA
INT/SQW
32KHZ
INTERRUPTS
CPU
RST
V
BAT
PUSH-
BUTTON
RESET
For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/DS3232M.related
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.
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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