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LM76CNM-3
0.5C/ 1C/ 12-Bit Sign Digital Temperature Sensor and Thermal Window Comparator with Two-Wire Interface
LM76
±0.5˚C, ±1˚C, 12-Bit+ Sign Digital Temperature Sensor
and Thermal Window Comparator with Two-Wire
Interface
General DescriptionThe LM76isa digital temperature sensorand thermal win-
dow comparator withan I2C™ Serial Bus interface withan
accuracyof ±1˚C. This accuracyforthe LM76CHMis speci-
fiedfora −10˚Cto 45˚C temperature range, whileforthe
LM76CNMthe temperature rangeis 70˚Cto 100˚C. The
LM76CHMis specifiedwithan accuracy ±0.5˚C at25˚C.The
window-comparator architectureofthe LM76 easesthede-
signof temperature control systems conformingtothe ACPI
(Advanced Configurationand Power Interface) specification
for personal computers.The open-drain Interrupt (INT)out-
put becomes active whenever temperature goes outsidea
programmable window, whilea separate Critical Tempera-
ture Alarm (T_CRIT_A) output becomes active whenthe
temperature exceedsa programmable critical limit. TheINT
outputcan operatein eithera comparatoror event mode,
whilethe T_CRIT_A output operatesin comparator mode
only.
The hostcan program boththe upperand lower limitsofthe
windowas wellasthe critical temperature limit. Program-
mable hysterisisas wellasa fault queueare availableto
minimize false tripping. Two pins (A0,A1)are availablefor
address selection.The sensorpowersupwith defaultthresh-
oldsof 2˚C THYST, 10˚C TLOW, 64˚C THIGH, and 80˚C
T_CRIT.
The LM76’s 3.3Vand 5.0V supply voltage, SerialBus inter-
face,12-bit+ sign output,and full-scale rangeof over 127˚C
makeit idealfora wide rangeof applications. These include
thermalmanagement andprotection applications inpersonal
computers, electronictest equipment, office electronicsand
bio-medical applications.
Features Window comparison simplifies designof ACPI
compatible temperature monitoringand control. SerialBus interface Separate open-drain outputsfor Interruptand Critical
Temperature shutdown Shutdown modeto minimize power consumptionUpto4 LM76scanbe connectedtoa singlebus 12-bit+ sign output; full-scale readingof over 127˚C
Key Specifications Supply Voltage 3.3Vor 5.0V Supply Current operating 250μA (typ)
450μA (max)
shutdown 8μA (max) Temperature
Accuracy
+25˚C
−10˚Cto +45˚C
±0.5˚C(max)
±1.0˚C(max)
70˚Cto 100˚C ±1.0˚C(max) Resolution 0.0625˚C
Applications System Thermal Management Personal Computers Office Electronics HVAC
I2C®isaregistered trademarkof PhilipsCorporation.
January 2000
LM76
0.5˚C,
1˚C,
12-Bit
Sign
Digital
emperature
Sensor
and
Thermal
indow
Comparator
with
wo-W
ire
Interface©2000 National Semiconductor Corporation DS101015
