DS3231SN Datasheet Download

Part No.:
DS3231SN
Download:
Download Datasheet
Description:
[Extremely Accurate I2C-Integrated RTC/TCXO/Crystal]
File Size:
363 K
Page:
20 Pages
Logo:
Manufacturer:
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
PCB Prototype
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19-5170; Rev 7; 3/10
Extremely Accurate I
2
C-Integrated
RTC/TCXO/Crystal
General Description
The DS3231 is a low-cost, extremely accurate I
2
C real-
time clock (RTC) with an integrated temperature-
compensated crystal oscillator (TCXO) and crystal. The
device incorporates a battery input, and maintains accu-
rate timekeeping when main power to the device is inter-
rupted. 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 DS3231
is available in commercial and industrial temperature
ranges, and is offered in a 16-pin, 300-mil SO package.
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 programmable square-wave output
are provided. Address and data are transferred serially
through an I
2
C bidirectional bus.
A precision temperature-compensated voltage refer-
ence 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 nec-
essary. Additionally, the
RST
pin is monitored as a
pushbutton input for generating a µP reset.
Features
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
Low-Power Consumption
Real-Time Clock Counts Seconds, Minutes,
Hours, Day, Date, Month, and Year with Leap Year
Compensation Valid Up to 2100
Two Time-of-Day Alarms
Programmable Square-Wave Output
Fast (400kHz) I
2
C Interface
3.3V Operation
Digital Temp Sensor Output: ±3°C Accuracy
Register for Aging Trim
RST
Output/Pushbutton Reset Debounce Input
Underwriters Laboratories (UL
®
) Recognized
DS3231
Ordering Information
PART
DS3231S#
DS3231SN#
TEMP RANGE
PIN-PACKAGE
TOP
MARK
DS3231
DS3231N
0°C to +70°C 16 SO
-40°C to +85°C 16 SO
Applications
Servers
Telematics
Utility Power Meters
GPS
Pin Configuration appears at end of data sheet.
#Denotes a RoHS-compliant device that may include lead that
is exempt under RoHS requirements. The 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.
Typical Operating Circuit
V
CC
V
CC
R
PU
= t
R
/C
B
R
PU
SCL
μP
SDA
RST
PUSHBUTTON
RESET
R
PU
V
CC
SCL
SDA
RST
N.C.
N.C.
N.C.
N.C.
GND
INT/SQW
32kHz
V
BAT
V
CC
DS3231
N.C.
N.C.
N.C.
N.C.
UL is a registered trademark of Underwriters Laboratories, Inc.
______________________________________________
Maxim Integrated Products
1
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.