1FEATURES
2• Window Comparison Simplifies Design of
ACPI Compatible Temperature Monitoring and
Control.
• Serial Bus Interface
• Separate Open-Drain Outputs for Interrupt and
Critical Temperature Shutdown
• Shutdown Mode to Minimize Power
Consumption
• Up to 4 LM76s can be Connected to a Single
Bus
• 12-bit + Sign Output; Full-scale Reading of
Over 127°C

KEY SPECIFICATIONS
• Supply Voltage 5.0V
• Supply Current
– Operating
– 250 μA (typ)
– 450 μA (max)
– Shutdown
– 8 μA (max)
• Temperature +25ºC ±0.5ºC (max)
– Accuracy
– –10ºC to +45ºC ±10°C (max)
– 70°C to 100°C ±1.0°C (max)
• Resolution 0.0625°C

APPLICATIONS
• System Thermal Management
• Personal Computers
• Office Electronics
• HVAC

DESCRIPTION
The LM76 is a digital temperature sensor and thermal
window comparator with an I2 C Serial Bus interface
with an accuracy of ±1°C. This accuracy for the
LM76CHM is specified for a −10°C to 45°C
temperature range. The LM76CHM is specified with
an accuracy ±0.5°C at 25°C. The window-comparator
architecture of the LM76 eases the design of
temperature control systems conforming to the ACPI
(Advanced Configuration and Power Interface)
specification for personal computers. The open-drain
Interrupt (INT) output becomes active whenever
temperature goes outside a programmable window,
while a separate Critical Temperature Alarm
(T_CRIT_A) output becomes active when the
temperature exceeds a programmable critical limit.
The INT output can operate in either a comparator or event mode, while the T_CRIT_A output operates in
comparator mode only.
The host can program both the upper and lower limits
of the window as well as the critical temperature limit.
Programmable hysterisis as well as a fault queue are
available to minimize false tripping. Two pins (A0, A1)
are available for address selection. The sensor
powers up with default thresholds of 2°C THYST, 10°C
TLOW, 64°C THIGH, and 80°C T_CRIT.
The LM76's 5.0V supply voltage, Serial Bus interface,
12-bit + sign output, and full-scale range of over
127°C make it ideal for a wide range of applications.
These include thermal management and protection
applications in personal computers, electronic test
equipment, office electronics and bio-medical
applications.