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DS3232N PDF预览

DS3232N

更新时间: 2024-11-10 04:15:15
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美信 - MAXIM 晶体静态存储器
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18页 247K
描述
Extremely Accurate I2C RTC with Integrated Crystal and SRAM

DS3232N 数据手册

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Rev 3; 10/07  
2
Extremely Accurate I C RTC with  
Integrated Crystal and SRAM  
DS32  
General Description  
Features  
Accuracy 2ppm from 0°C to +40°C  
The DS3232 is a low-cost temperature-compensated  
crystal oscillator (TCXO) with a very accurate, tempera-  
ture-compensated, integrated real-time clock (RTC) and  
236 bytes of battery-backed SRAM. Additionally, the  
DS3232 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 DS3232  
is available in commercial and industrial temperature  
ranges, and is offered in an industry-standard 20-pin,  
300-mil SO package.  
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  
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 I2C bidirectional bus.  
Programmable Square-Wave Output  
2
Fast (400kHz) I C 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 (UL ) Recognized  
A precision temperature-compensated voltage refer-  
Ordering Information  
ence and comparator circuit monitors the status of V  
CC  
PIN-  
PACKAGE  
TOP  
MARK  
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 reset externally.  
PART  
TEMP RANGE  
DS3232S#  
0°C to +70°C  
20 SO  
20 SO  
DS3232  
DS3232SN#  
-40°C to +85°C  
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.  
Applications  
Utility Power Meters  
GPS  
Servers  
Telematics  
Typical Operating Circuit  
Pin Configuration  
TOP VIEW  
V
V
CC  
CC  
R
PU  
= t / C  
R B  
N.C.  
N.C.  
1
2
3
4
5
6
7
8
9
20 SCL  
19 N.C.  
18 SCL  
17 SDA  
V
CC  
R
PU  
R
PU  
V
32kHz  
CC  
SCL  
SDA  
RST  
N.C.  
INT/SQW  
32kHz  
V
CC  
CPU  
INT/SQW  
RST  
16 V  
BAT  
DS3232  
V
BAT  
PUSH-  
BUTTON  
RESET  
15 GND  
N.C.  
N.C.  
N.C.  
N.C.  
N.C.  
N.C.  
N.C.  
N.C.  
N.C.  
14  
DS3232  
N.C.  
N.C.  
13 N.C.  
12 N.C.  
11 N.C.  
N.C.  
N.C.  
N.C.  
GND  
N.C. 10  
SO  
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.  

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