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ELM341SM 参数 Datasheet PDF下载

ELM341SM图片预览
型号: ELM341SM
PDF下载: 下载PDF文件 查看货源
内容描述: 低功率恒温器 [LOW POWER THERMOSTAT]
分类和应用:
文件页数/大小: 4 页 / 32 K
品牌: ELM [ ELM ELECTRONICS ]
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ELM341  
Low Power Thermostat  
Description  
Features  
The ELM341 is  
a
complete temperature  
• Low power CMOS design  
measurement and control system in an 8 pin  
package. It automatically reverts to a very low power  
sleep mode between measurements, making it  
suitable for battery operation.  
• Wide supply range - 3.0 to 5.5 volt operation  
• Built-in proportional hysteresis  
• Measurement in progress output  
• Time delay on operate improves noise immunity  
• Internal pullup resistor on the reset input  
• High current drive outputs - up to 25 mA  
• Sleep mode reduces power requirements  
This integrated circuit is designed to compare  
two resistances and drive an output pin depending  
on the relative value of each. Typically, one of the  
resistors will be an NTC thermistor, and the other  
one will be a temperature independent resistor  
(whether fixed or variable). When the magnitude of  
the resistance connected to pin 2 exceeds the value  
of the resistance connected to pin 3, the output pin  
will be driven to a high state. Hysteresis maintains  
the output in that state until the relative values differ  
by approximately 8% (or typically 2°C for a 10KW  
thermistor).  
Connection Diagram  
PDIP and SOIC  
(top view)  
To reduce the possibility of sporadic outputs, a  
condition must exist for three successive cycles, or 6  
seconds, before the output pin can change state.  
1
2
3
4
8
7
6
5
VDD  
R1  
VSS  
Out  
MIP  
Cap  
R2  
Applications  
reset  
• Backup thermostats  
• Under or over temperature alarm circuits  
Block Diagram  
VDD  
Sleep  
Timer  
Control  
4
reset  
Measurement in Progress (busy)  
2
6
7
MIP  
Out  
3
R1  
Overrange  
R2  
Analog to  
Digital  
Converter  
R1 > R2  
3 Consecutive  
Measurements  
5
ELM341DSB  
Elm Electronics – Circuits for the Hobbyist  
1 of 4  
< http://www.elmelectronics.com/ >