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LM95231

更新时间： 2024-09-11 02:58:19
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德州仪器 - TI /
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30页 1085K
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Precision Dual Remote Diode Temperature Sensor with SMBus Interface and TruTherm™ Technology

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LM95231  
www.ti.com  
SNIS139E –FEBRUARY 2005–REVISED MARCH 2013  
LM95231 Precision Dual Remote Diode Temperature Sensor with SMBus Interface and  
TruTherm™ Technology  
Check for Samples: LM95231  
1
FEATURES  
KEY SPECIFICATIONS  
2
•
Accurately Senses Die Temperature of Remote  
ICs or Diode Junctions  
•
•
•
•
Remote Temperature Accuracy ±0.75°C (max)  
Local Temperature Accuracy ±3.0°C (max)  
Supply Voltage 3.0V to 3.6V  
•
•
Uses TruTherm Technology for Precision  
“Thermal Diode” Temperature Measurement  
Supply Current 402μA (typ)  
Thermal Diode Input Stage with Analog  
Filtering  
APPLICATIONS  
•
•
Thermal Diode Digital Filtering  
•
Processor/Computer System Thermal  
Management  
Intel Pentium 4 Processor on 90nm Process or  
2N3904 Non-ideality Selection  
–
e.g. Laptop, Desktop, Workstations, Server)  
•
•
•
Remote Diode Fault Detection  
•
•
Electronic Test Equipment  
Office Electronics  
On-board Local Temperature Sensing  
Remote Temperature Readings Without Digital  
Filtering:  
DESCRIPTION  
–
–
0.125°C LSb  
The LM95231 is a precision dual remote diode  
temperature sensor (RDTS) that uses Texas  
Instruments' TruTherm technology. The 2-wire serial  
interface of the LM95231 is compatible with SMBus  
2.0. The LM95231 can sense three temperature  
zones, it can measure the temperature of its own die  
as well as two diode connected transistors. The  
LM95231 includes digital filtering and an advanced  
input stage that includes analog filtering and  
TruTherm technology that reduces processor-to-  
processor non-ideality spread. The diode connected  
transistors can be a “thermal diode” as found in Intel  
and AMD processors or can simply be a diode  
10-bits Plus Sign or 11-bits Programmable  
Resolution  
–
11-bits Resolves Temperatures Above  
127 °C  
•
•
Remote Temperature Readings with Digital  
Filtering:  
–
–
0.03125°C LSb with Filtering  
12-bits Plus Sign or 13-bits Programmable  
Resolution  
–
13-bits Resolves Temperatures Above  
127°C  
connected  
MMBT3904  
transistor.  
TruTherm  
technology allows accurate measurement of “thermal  
diodes” found on small geometry processes, 90nm  
and below. The LM95231 supports user selectable  
thermal diode non-ideality of either a Pentium 4  
processor on 90nm process or 2N3904.  
Local Temperature Readings:  
–
–
0.25°C  
9-bits Plus Sign  
•
•
Status Register Support  
The LM95231 resolution format for remote  
temperature readings can be programmed to be 11-  
bits signed or unsigned with the digital filtering  
disabled. When the filtering is enabled the resolution  
increases to 13-bits signed or unsigned. In the  
unsigned mode the LM95231 remote diode readings  
can resolve temperatures above 127°C. Local  
temperature readings have a resolution of 9-bits plus  
sign.  
Programmable Conversion Rate Allows User  
Optimization of Power Consumption  
•
•
Shutdown Mode One-shot Conversion Control  
SMBus 2.0 Compatible Interface, Supports  
TIMEOUT  
•
8-pin VSSOP Package  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
2
All trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2005–2013, Texas Instruments Incorporated  
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