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LM95221_15

更新时间： 2024-11-28 01:11:35
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德州仪器 - TI /
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25页 1006K
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Dual Remote Diode Digital Temperature Sensor with SMBus Interface

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LM95221_15 数据手册

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LM95221  
www.ti.com  
SNIS134B –MAY 2004–REVISED MARCH 2013  
LM95221 Dual Remote Diode Digital Temperature Sensor with SMBus Interface  
Check for Samples: LM95221  
1
FEATURES  
APPLICATIONS  
2
•
Accurately Senses Die Temperature of Remote  
ICs or Diode Junctions  
•
Processor/Computer System Thermal  
Management (e.g. Laptop, Desktop,  
Workstations, Server)  
•
•
•
Remote Diode Fault Detection  
On-board Local Temperature Sensing  
Remote Temperature Readings  
•
•
Electronic Test Equipment  
Office Electronics  
–
–
0.125°C LSb  
DESCRIPTION  
10-bits Plus Sign or 11-bits Programmable  
Resolution  
The LM95221 is a dual remote diode temperature  
sensor in an 8-lead VSSOP package. The 2-wire  
serial interface of the LM95221 is compatible with  
SMBus 2.0. The LM95221 can sense three  
temperature zones, it can measure the temperature  
of its own die as well as two diode connected  
transistors. The diode connected transistors can be a  
thermal diode as found in Pentium and AMD  
processors or can simply be a diode connected  
MMBT3904 transistor. The LM95221 resolution  
format for remote temperature readings can be  
programmed to be 10-bits plus sign or 11-bits  
unsigned. In the unsigned mode the LM95221 remote  
diode readings can resolve temperatures above  
127°C. Local temperature readings have a resolution  
of 9-bits plus sign.  
–
11-bits Resolves Temperatures Above  
127°C  
•
Local Temperature Readings  
–
–
0.25°C  
9-bits Plus Sign  
•
•
Status Register Support  
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  
The temperature of any ASIC can be accurately  
determined using the LM95221 as long as  
a
KEY SPECIFICATIONS  
dedicated diode (semiconductor junction) is available  
on the target die. The LM95221 remote sensor  
accuracy of ±1°C is factory trimmed for a series  
resistance of 2.7 ohms and 1.008 non-ideality factor.  
•
Local Temperature Accuracy  
TA = 0°C to 85°C ± 3.0°C (max)  
Remote Diode Temperature Accuracy  
–
•
–
TA = 30°C to 50°C, TD = 45°C to 85°C  
±1.0 °C (Max)  
–
TA = 0°C to 85°C, TD = 25°C to 140°C  
±3.0°C (Max)  
•
•
Supply Voltage 3.0 V to 3.6 V  
Supply Current 2 mA (Typ)  
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 © 2004–2013, Texas Instruments Incorporated  
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