DS3232M_V1 Datasheet, PDF (1/23 Pages) Maxim Integrated Products – ±5ppm, I2C Real-Time Clock with SRAM

19-6247; Rev 1; 8/12
DS3232M
±5ppm, I²C Real-Time Clock with SRAM
General Description
The DS3232M is a low-cost, extremely accurate, I²C
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.
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
are transferred serially through an I²C bidirectional bus.
A precision temperature-compensated voltage reference
and comparator circuit monitors the status of V_CC to
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.
Applications
Power Meters
Industrial Applications
Ordering Information appears at end of data sheet.
Features
S Timekeeping Accuracy ±5ppm (±0.432 Second/
Day) from -40NC to +85NC
S 236 Bytes of Battery-Backed User SRAM
S Battery Backup for Continuous Timekeeping
S Low Power Consumption
S Functionally Compatible to DS3232
S Complete Clock Calendar Functionality Including
Seconds, Minutes, Hours, Day, Date, Month, and
Year with Leap Year Compensation Up to Year
2100
S Two Time-of-Day Alarms
S 1Hz and 32.768kHz Outputs
S Reset Output and Pushbutton Input with
Debounce
S Fast (400kHz) I²C-Compatible Serial Bus
S +2.3V to +4.5V Supply Voltage
S Digital Temp Sensor with ±3NC Accuracy
S -40NC to +85NC Temperature Range
S 8-Pin SO (150 mils) Package
S Underwriters Laboratories (UL) Recognized
Typical Operating Circuit
VCC
VCC
I/O PORT
INTERRUPTS
CPU
PUSH-
BUTTON
RESET
SCL
DS3232M
SDA
INT/SQW
32KHZ
RST
V_BAT
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
  1
at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.