Datasheet

LM76
www.ti.com SNIS109E –JANUARY 2000–REVISED MARCH 2013
LM76 ±0.5°C, ±1°C, 12-Bit + Sign Digital Temperature Sensor and Thermal Window
Comparator with Two-Wire Interface
Check for Samples: LM76
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FEATURES
DESCRIPTION
The LM76 is a digital temperature sensor and thermal
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• Window Comparison Simplifies Design of
window comparator with an I
2
C Serial Bus interface
ACPI Compatible Temperature Monitoring and
with an accuracy of ±1°C. This accuracy for the
Control.
LM76CHM is specified for a −10°C to 45°C
• Serial Bus Interface
temperature range. The LM76CHM is specified with
an accuracy ±0.5°C at 25°C. The window-comparator
• Separate Open-Drain Outputs for Interrupt and
architecture of the LM76 eases the design of
Critical Temperature Shutdown
temperature control systems conforming to the ACPI
• Shutdown Mode to Minimize Power
(Advanced Configuration and Power Interface)
Consumption
specification for personal computers. The open-drain
• Up to 4 LM76s can be Connected to a Single
Interrupt (INT) output becomes active whenever
Bus
temperature goes outside a programmable window,
while a separate Critical Temperature Alarm
• 12-bit + Sign Output; Full-scale Reading of
(T_CRIT_A) output becomes active when the
Over 127°C
temperature exceeds a programmable critical limit.
The INT output can operate in either a comparator or
KEY SPECIFICATIONS
event mode, while the T_CRIT_A output operates in
• Supply Voltage 5.0V comparator mode only.
• Supply Current
The host can program both the upper and lower limits
of the window as well as the critical temperature limit.
– Operating
Programmable hysterisis as well as a fault queue are
– 250 µA (typ)
available to minimize false tripping. Two pins (A0, A1)
– 450 µA (max)
are available for address selection. The sensor
– Shutdown powers up with default thresholds of 2°C T
HYST
, 10°C
T
LOW
, 64°C T
HIGH
, and 80°C T_CRIT.
– 8 µA (max)
The LM76's 5.0V supply voltage, Serial Bus interface,
• Temperature +25ºC ±0.5ºC (max)
12-bit + sign output, and full-scale range of over
– Accuracy
127°C make it ideal for a wide range of applications.
– –10ºC to +45ºC ±10°C (max)
These include thermal management and protection
– 70°C to 100°C ±1.0°C (max) applications in personal computers, electronic test
equipment, office electronics and bio-medical
• Resolution 0.0625°C
applications.
APPLICATIONS
• System Thermal Management
• Personal Computers
• Office Electronics
• HVAC
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PRODUCTION DATA information is current as of publication date.
Copyright © 2000–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.