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LM95234_15

更新时间： 2024-11-28 01:21:51
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德州仪器 - TI /
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44页 1151K
描述
Quad Remote Diode and Local Temperature Sensor with SMBus Interface and TruTherm™ Technology

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LM95234_15 数据手册

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LM95234  
www.ti.com  
SNIS136D –AUGUST 2006–REVISED MARCH 2013  
LM95234 Quad Remote Diode and Local Temperature Sensor with SMBus Interface and  
TruTherm™ Technology  
Check for Samples: LM95234  
1
FEATURES  
–
(e.g. Laptop, Desktop, Workstations,  
Server)  
23  
•
Accurately Senses Die Temperature of 4  
Remote ICs or Diode Junctions and Local  
Temperature  
•
•
Electronic Test Equipment  
Office Electronics  
•
•
TruTherm BJT Beta Compensation Technology  
Accurately Senses Sub-micron Process  
Thermal Diodes  
DESCRIPTION  
LM95234 is an 11-bit digital temperature sensor with  
a 2-wire System Management Bus (SMBus) interface  
that can very accurately monitor the temperature of  
four remote diodes as well as its own temperature  
that includes patent pending remote diode  
Programmable Digital Filters and Analog Front  
End Filter  
•
•
0.125°C LSb Temperature Resolution  
TruTherm™  
BJT  
beta  
compensation  
beta  
0.03125°C LSb Remote Temperature  
Resolution with Digital Filter Enabled  
compensation technology. The four remote diodes  
can be external devices such as microprocessors,  
graphics processors or diode-connected 2N3904s.  
The LM95234's TruTherm BJT beta compensation  
technology allows sensing of 90 nm or 65 nm process  
thermal diodes accurately.  
•
•
+127.875°C/–128°C and 0°C/255°C Remote  
Ranges  
Remote Diode Fault Detection, Model  
Selection and Offset Correction  
•
•
Mask and Status Register Support  
The LM95234 reports temperature in two different  
formats for +127.875°C/–128°C range and 0°C/255°C  
range. The LM95234 TCRIT1, TCRIT2 and TCRIT3  
outputs are triggered when any unmasked channel  
exceeds its corresponding programmable limit and  
can be used to shutdown the system, to turn on the  
system fans or as a microcontroller interrupt function.  
The current status of the TCRIT1, TCRIT2 and  
TCRIT3 pins can be read back from the status  
registers. Mask registers are available for further  
control of the TCRIT outputs.  
3 Programmable TCRIT Outputs with  
Programmable Shared Hysteresis and Fault-  
Queue  
•
•
Programmable Conversion Rate and Shutdown  
Mode One-shot Conversion Control  
SMBus 2.0 Compatible Interface, Supports  
TIMEOUT  
•
•
Three-level Address Pin  
14-pin WSON Package  
Two LM95234 remote temperature channels have  
programmable digital filters while the other two  
remote channels utilize a fault-queue to minimize  
unwanted TCRIT events when temperature spikes  
are encountered.  
KEY SPECIFICATIONS  
•
•
Local Temperature Accuracy ±2.0°C (max)  
Remote Diode Temperature Accuracy ±0.875°C  
(max)  
For optimum flexibility and accuracy, each LM95234  
channel includes registers for sub-micron process or  
2N3904 diode model selection as well as offset  
•
•
Supply Voltage 3.0V to 3.6V  
Average Supply Current (1Hz conversion rate)  
correction.  
A
three-level address pin allows  
connection of up to 3 LM95234s to the same SMBus  
master. The LM95234 includes power saving  
functions such as: programmable conversion rate,  
shutdown mode, and disabling of unused channels.  
APPLICATIONS  
•
Processor/Computer System Thermal  
Management  
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
3
TruTherm is a trademark of Texas Instruments.  
All other 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 © 2006–2013, Texas Instruments Incorporated  
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