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LM91DIMQA

更新时间: 2024-11-23 03:51:39
品牌 Logo 应用领域
冲电气 - OKI 二极管传感器换能器温度传感器输出元件
页数 文件大小 规格书
14页 182K
描述
Diode Input Digital Temperature Sensor with Two-Wire Interface

LM91DIMQA 数据手册

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November 2001  
LM91  
Diode Input Digital Temperature Sensor with Two-Wire  
Interface  
n Register readback capability  
n 7 bit plus sign temperature data format  
n 2 address select lines enable 9 LM91s to be connected  
to a single bus  
General Description  
The LM91 is  
a remote diode temperature sensor,  
Delta-Sigma analog-to-digital converter, and digital  
over-temperature detector with an SMBus interface. The  
LM91 senses its own temperature as well as the tempera-  
ture of a target IC with a diode junction, such as a Pentium®  
II processor or a diode connected 2N3904. A diode junction  
(semiconductor junction) is required on the target IC’s die. A  
host can query the LM91 at any time to read the temperature  
of this diode as well as the temperature state of the LM91  
itself. A T_CRIT_A interrupt output becomes active when the  
temperature is greater than a programmable comparator  
limit, T_CRIT.  
Key Specifications  
j
j
j
j
Supply Voltage  
3.0V - 3.6V  
1 mA (max)  
Supply Current  
±
Local Temperature Accuracy  
Remote Diode Temperature Accuracy  
+60˚C to +100˚C  
1.0˚C (typ)  
±
4˚C (max)  
6˚C (max)  
±
0˚C to +125˚C  
The host can program as well as read back the state of the  
T_CRIT register. Power up default values for T_CRIT are as  
shown in the ordering information table. Three state logic  
inputs allow two pins (ADD0, ADD1) to select up to 9 SMBus  
address locations for the LM91.  
Applications  
n System Thermal Management  
n Personal Computers  
n Electronic Test Equipment  
n Office Electronics  
Features  
n Directly senses die temperature of remote ICs  
n Senses temperature of remote diodes  
n SMBus compatible interface, supports SMBus Timeout  
n HVAC  
Simplified Block Diagram  
20034301  
# Indicates Active Low (”NOT“)  
SMBus is a trademark of the Intel Corporation.  
Pentium® II processor is a registered trademark of the Intel Corporation.  
2
I
C® is a registered trademark of the Philips Corporation.  
© 2001 National Semiconductor Corporation  
DS200343  
www.national.com  

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