1FEATURES

23• 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 Four LM92s can be Connected to a

Single Bus

• 12-Bit + Sign Output

• Operation up to 150°C

APPLICATIONS

• HVAC

• Medical Electronics

• Electronic Test Equipment

• System Thermal Management

• Personal Computers

• Office Electronics

• Automotive

KEY SPECIFICATIONS

• Supply Voltage 2.7V to 5.5V

• Supply Current operating 350 μA (typ) 625 μA

(max) shutdown 5 μA (typ)

• Temperature Accuracy

– 30°C, ±0.33°C (max)

– 10°C to 50°C, ±0.50°C (max)

– −10°C to 85°C, ±1.0°C (max)

– 125°C, ±1.25°C (max)

– −25°C to 150°C, ±1.5°C (max)

• Linearity ±0.5°C (max)

• Resolution 0.0625°C

DESCRIPTION

The LM92 is a digital temperature sensor and thermal

window comparator with an I2 C™ Serial Bus interface

and an accuracy of ±0.33°C. The window-comparator

architecture of the LM92 eases the design of

temperature control systems. 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 Hysteresis 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 LM92's 2.7V to 5.5V supply voltage range, Serial

Bus interface, 12-bit + sign output, and full-scale

range of over 128°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,

automotive, medical and HVAC applications.