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The LM77 is a digital temperature sensor and thermal
window comparator with an I2C Serial Bus interface.
The window-comparator architecture of the LM77
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 LM77's 3.0V to 5.5V supply voltage range, Serial
Bus interface, 9-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, and HVAC applications.