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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.