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LM77

Texas Instruments
Part Number LM77
Manufacturer Texas Instruments
Description 9-Bit + Sign Digital Temperature Sensor and Thermal Window Comparator
Published Mar 11, 2020
Detailed Description LM77 www.ti.com SNIS103F – JUNE 1999 – REVISED MARCH 2013 LM77 9-Bit + Sign Digital Temperature Sensor and Thermal Wi...
Datasheet PDF File LM77 PDF File

LM77
LM77

Overview
LM77 www.
ti.
com SNIS103F – JUNE 1999 – REVISED MARCH 2013 LM77 9-Bit + Sign Digital Temperature Sensor and Thermal Window Comparator with Two-Wire Interface Check for Samples: LM77 FEATURES 1 •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 LM77s Can be Connected to a Single Bus • 9-bit + Sign Output; Full-Scale Reading of Over 128°C • SOIC and VSSOP 8-lead Packages APPLICATIONS • System Thermal Management • Personal Computers • Office Electronics • Electronic Test Equipment • Automotive • HVAC KEY SPECIFICATIONS • Supply Voltage 3.
0V to 5.
5V • Supply Current – Operating – 250 μA (typ) – 500 μA (max) – Shutdown – 5 μA (typ) • Temperature Accuracy – −10°C to 65°C, ±1.
5°C(max) – −25°C to 100°C, ±2°C(max) – −55°C to 125°C, ±3°C(max) DESCRIPTION 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...


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