EVALUATION KIT AVAILABLE
DS3232
Extremely Accurate I2C RTC with
Integrated Crystal and SRAM
General Description
Features
The DS3232 is a low-cost temperature-compensated
crystal oscillator (TCXO) with a very accurate, temperature-compensated, integrated real-time clock (RTC) and
236 bytes of battery-backed SRAM. Additionally, the
DS3232 incorporates a battery input and maintains accurate timekeeping when main power to the device is interrupted. The integration of the crystal resonator enhances
the long-term accuracy of the device as well as reduces
the piece-part count in a manufacturing line. The DS3232
is available in commercial and industrial temperature
ranges, and is offered in an industry-standard 20-pin,
300-mil SO package.
♦ Accuracy ±2ppm from 0°C to +40°C
♦ Accuracy ±3.5ppm from -40°C to +85°C
♦ Battery Backup Input for Continuous
Timekeeping
♦ Operating Temperature Ranges
Commercial: 0°C to +70°C
Industrial: -40°C to +85°C
♦ 236 Bytes of Battery-Backed SRAM
♦ Low-Power Consumption
♦ Real-Time Clock Counts Seconds, Minutes,
Hours, Day, Date, Month, and Year with Leap Year
Compensation Valid Up to 2099
♦ Two Time-of-Day Alarms
♦ Programmable Square-Wave Output
♦ Fast (400kHz) I2C Interface
♦ 3.3V Operation
♦ Digital Temp Sensor Output: ±3°C Accuracy
♦ Register for Aging Trim
♦ RST Input/Output
♦ 300-Mil, 20-Pin SO Package
♦ Underwriters Laboratories Recognized
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-ofday alarms and a programmable square-wave 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 µP reset.
Ordering Information
PART
DS3232S#
DS3232SN#
Applications
Functional Diagrams
Utility Power Meters
Servers
Telematics
GPS
TEMP RANGE
0°C to +70°C
20 SO
DS3232
20 SO
DS3232N
#Denotes a RoHS-compliant device that may include lead that
is exempt under the RoHS requirements. Lead finish is JESD97
Category e3, and is compatible with both lead-based and
lead-free soldering processes. A "#" anywhere on the top mark
denotes a RoHS-compliant device.
N.C. 1
RPU
RPU
PUSHBUTTON
RESET
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
18 SCL
INT/SQW
VCC 4
32kHz
VBAT
SCL
SDA
RST
SCL
SDA
RST
19 N.C.
32kHz 3
VCC
20 SCL
N.C. 2
VCC
μP
Pin Configuration
TOP VIEW
VCC
VCC
INT/SQW 5
17 SDA
DS3232
16 VBAT
RST 6
DS3232
GND
TOP
MARK
-40°C to +85°C
Typical Operating Circuit
RPU = tR / CB
PINPACKAGE
N.C.
N.C.
N.C.
N.C.
N.C.
Pin Configurations appear at end of data sheet.
Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
15 GND
N.C. 7
14 N.C.
N.C. 8
13 N.C.
N.C. 9
12 N.C.
N.C. 10
11 N.C.
SO
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5337; Rev 5; 7/10