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 microelectromechanical systems (MEMS) resonator enhances the
long-term accuracy of the device and reduces the piecepart 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 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 microprocessor reset. See the
Block Diagram for more details.

Applications
Power Meters
Industrial Applications

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