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DS32B35-33IND

更新时间： 2024-11-02 02:59:31
品牌 Logo 应用领域
美信 - MAXIM 晶体石英晶振温度补偿晶振
页数 文件大小 规格书
21页 279K
描述
Accurate I2C RTC with Integrated TCXO/Crystal/FRAM

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DS32B35-33IND 数据手册

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Rev 0; 12/06  
2
Accurate I C RTC with Integrated  
TCXO/Crystal/FRAM  
DS2x35  
General Description  
Features  
o Integrated 32.768kHz Crystal  
o Fast (400kHz) I2C Interface  
The DS32x35 accurate real-time clock (RTC) is a tem-  
perature-compensated clock/calendar that includes an  
integrated 32.768kHz crystal and a bank of nonvolatile  
memory in a single package. The nonvolatile memory is  
available in two densities: 2048 x 8 and 8192 x 8 bits.  
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 device  
o RTC Counts Seconds, Minutes, Hours, Day, Date,  
Month, and Year with Leap Year Compensation  
Valid Up to 2100  
o RTC Accuracy 2ppm from 0°C to +40°C  
o RTC Accuracy 3.5ppm from -40°C to 0°C and  
+40°C to +85°C  
2
operates as a slave device on an I C serial interface,  
o Nonvolatile Memory with 10 Years of Guaranteed  
and is available in both commercial and industrial tem-  
perature ranges in a 300-mil, 20-pin SO package.  
Backup Time and Write Protection  
o Two Available Densities of Nonvolatile Memory  
2048 Bytes (DS32B35)  
The DS32x35 includes a bank of nonvolatile memory  
that does not require a backup energy source to main-  
tain memory contents. In addition, there are no read or  
write cycle limitations. The memory array can be  
accessed at maximum cycle rates for the life of the  
product with no wear-out mechanisms.  
8192 Bytes (DS32C35)  
o No Cycle Limitations on Memory  
o Power-Switching Circuit Selects Between Main  
Power and Battery Backup for the RTC  
o Programmable Square Wave with Frequency of  
32.768kHz, 8.192kHz, 4.096kHz, or 1Hz  
Other device features include two time-of-day alarms, a  
selectable output that provides either an interrupt or pro-  
grammable square wave, and a calibrated 32.768kHz  
square-wave output. A reset input/output pin provides a  
power-on reset. Additionally, the reset pin is monitored  
as a pushbutton input for generating a reset externally.  
o Two Time-of-Day Alarms  
o Reset Output/Pushbutton Reset (Debounced)  
Input  
o Programmable Output Provides Interrupt or  
Square Wave  
o Calibrated 32.768kHz Open-Drain Output  
o Temp Sensor with 3°C Accuracy  
o 3.3V Operating Voltage  
o Commercial and Industrial Temperature Ranges  
o 300-mil, 20-Pin SO Package  
o Underwriters Laboratories (UL) Recognized  
A precision temperature-compensated reference and  
comparator circuit monitors the status of V  
and auto-  
CC  
matically switches to the backup supply when neces-  
sary. The backup supply maintains operation of the  
2
TCXO, clock, alarms, and RTC I C operation.  
Applications  
Servers  
Utility Power Meters  
Pin Configuration and Ordering Information appear at end  
of data sheet.  
Telematics  
GPS  
Typical Operating Circuit  
V
V
CC  
CC  
R
= t /C  
R B  
PU  
V
CC  
R
R
PU  
PU  
V
SCL  
SCL  
CC  
INT/SQW  
32kHz  
CPU  
SDA  
WP  
V
BAT  
DS32x35  
RST  
N.C.  
N.C.  
GND  
N.C.  
PUSHBUTTON  
RESET  
N.C.  
N.C.  
N.C.  
N.C.  
N.C.  
N.C.  
GND  
______________________________________________ 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.  
1234567...21

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