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LM77
9-Bit + Sign Digital Temperature Sensor and Thermal Window Comparator with Two-Wire Interface
LM77
9-Bit + Sign Digital Temperature Sensor and Thermal
Window Comparator with Two-Wire Interface
General DescriptionThe LM77isa digital temperature sensor and thermal win-
dow comparator withanI2C™ Serial Bus interface. The
window-comparator architectureofthe LM77 eases the de-
signof temperature control systems conformingtothe ACPI
(Advanced Configuration and 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 when the
temperature exceedsa programmable critical limit. The INT
output can operatein eithera comparatoror event mode,
while the T_CRIT_A output operatesin comparator mode
only.
The host can program boththe upper and lower limitsofthe
windowas wellas the critical temperature limit. Program-
mable hysterisisas wellasa fault queue are availableto
minimize false tripping. Two pins (A0, A1) are availablefor
address selection. The sensor powersup with default thresh-
oldsof 2˚C THYST, 10˚C TLOW, 64˚C THIGH, and 80˚C
T_CRIT.
The LM77’s 3.0Vto 5.5V supply voltage range, Serial Bus
interface, 9-bit+ sign output, and full-scale rangeof over
128˚C makeit idealfora wide rangeof applications. These
include thermal management and protection applicationsin
personal computers, electronic test equipment, office elec-
tronics, automotive, and HVAC applications.
Features Window comparison simplifies designof ACPI
compatible temperature monitoring and control. Serial Bus interface Separate open-drain outputsfor Interrupt and Critical
Temperature shutdown Shutdown modeto minimize power consumption Upto4 LM77s canbe connectedtoa single bus 9-bit+ sign output; full-scale readingof over 128˚C SOP and MSOP 8-lead packages
Key Specifications Supply Voltage 3.0Vto 5.5V Supply Current operating 250μA (typ)
500μA (max)
shutdown 5μA (typ) Temperature
Accuracy
−10˚Cto 65˚C ±1.5˚C(max)
−25˚Cto 100˚C ±2˚C(max)
−55˚Cto 125˚C ±3˚C(max)
Applications System Thermal Management Personal Computers Office Electronics Electronic Test Equipment Automotive HVAC
July 2001
LM77
9-Bit
Sign
Digital
emperature
Sensor
and
Thermal
indow
Comparator
with
wo-W
Interface
