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LM32-LM32CIMT-LM32CIMTX
Dual Thermal Diode Temperature Sensor with SensorPathtrade Bus
LM32
Dual Thermal Diode Temperature Sensor with
SensorPath™ Bus
General DescriptionThe LM32isa digital temperature sensor that measures3
temperature zones and hasa single-wire interface compat-
ible with National Semiconductor’s SensorPath bus. Sensor-
Path datais pulse width encoded, thereby allowingthe LM32be easily connectedto many general purpose micro-
controllers. Several National Semiconductor SuperI/O prod-
ucts includea fully integrated SensorPath master, that when
connectedtoan LM32 can realizea hardware monitor func-
tion that includes limit checkingfor measured values, au-
tonomousfan speed control and many other functions.
The LM32 measuresthe temperatureofits owndieas well two external devices suchasa processor thermal diodea diode connected transistor. The LM32 can resolve tem-
peraturesupto 255˚C and downto -256˚C. The operating
temperature rangeof the LM32is 0˚Cto +125˚C. The ad-
dress programming pin allows two LM32stobe placedon
one SensorPath bus.
Features SensorPath Interface2 hardware programmable addresses2 remote diode temperature sensor zones Internal local temperature zone 0.5˚C resolution Measures temperaturesupto 140˚C 14-lead TSSOP package
Key Specifications Temperature Sensor Accuracy ±3˚C (max) Temperature Range: LM32 junction 0˚Cto +85˚C Remote Temp Accuracy 0˚Cto +100˚C Power Supply Voltage +3.0Vto +3.6V Average Power Supply Current 0.5 mA (typ) Conversion Time(all Channels) 22.5msto 1456ms
Applications Microprocessor based equipment
(Motherboards, Video Cards, Base-stations, Routers,
ATMs, Pointof Sale,…) Power Supplies
Typical ApplicationMay 2004
LM32
Dual
Thermal
Diode
emperature
Sensor
with
SensorPath
Bus
