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LM95221CIMMXNSN/a80avaiDual Remote Diode Digital Temperature Sensor with SMBus Interface


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LM95221CIMMX
Dual Remote Diode Digital Temperature Sensor with SMBus Interface
LM95221
Dual Remote Diode Digital Temperature Sensor with
SMBus Interface
General Description

The LM95221isa dual remote diode temperature sensorin 8-lead MSOP package. The 2-wire serial interfaceof the
LM95221is compatible with SMBus 2.0. The LM95221 can
sense three temperature zones,it can measurethe tempera-
tureofits owndieas wellas two diode connected transis-
tors. The diode connected transistors canbea thermal diode foundin Pentium andAMD processorsor can simplybea
diode connected MMBT3904 transistor. The LM95221 reso-
lution formatfor remote temperature readings canbe pro-
grammedtobe 10-bits plus signor 11-bits unsigned.In the
unsigned mode the LM95221 remote diode readings can
resolve temperatures above 127˚C. Local temperature read-
ings havea resolutionof 9-bits plus sign.
The temperatureof any ASIC canbe accurately determined
usingthe LM95221as longasa dedicated diode (semicon-
ductor junction)is availableonthe target die. The LM95221
remote sensor accuracyof ±1˚Cis factory trimmedfora
series resistanceof2.7 ohms and 1.008 non-ideality factor.
Features
Accurately sensesdie temperatureof remote ICsor
diode junctions Remote diode fault detection On-board local temperature sensing Remote temperature readings: 0.125˚C LSb 10-bits plus signor 11-bits programmable resolution 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 power consumption Shutdown mode one-shot conversion control SMBus 2.0 compatible interface, supports TIMEOUT 8-pin MSOP package
Key Specifications
Local Temperature Accuracy
TA=0˚Cto 85˚C ±3.0˚C (max) Remote Diode Temperature Accuracy
TA=30˚Cto 50˚C, TD=45˚Cto 85˚C ±1.0˚C (max)
TA=0˚Cto 85˚C, TD=25˚Cto 140˚C ±3.0˚C (max) Supply Voltage 3.0Vto 3.6V Supply Current 2 mA (typ)
Applications
Processor/Computer System Thermal Management
(e.g. Laptop, Desktop, Workstations, Server) Electronic Test Equipment Office Electronics
Simplified Block Diagram

May 2004
LM95221
Dual
Remote
Diode
Digital
emperature
Sensor
with
SMBus
Interface
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