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LM77 Datasheet(PDF) 1 Page - Texas Instruments |
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LM77 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 24 page 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 1 FEATURES DESCRIPTION The LM77 is a digital temperature sensor and thermal 2 • Window Comparison Simplifies Design of window comparator with an I2C Serial Bus interface. ACPI Compatible Temperature Monitoring and The window-comparator architecture of the LM77 Control. eases the design of temperature control systems • Serial Bus Interface conforming to the ACPI (Advanced Configuration and Power Interface) specification for personal • Separate Open-Drain Outputs for Interrupt and computers. The open-drain Interrupt (INT) output Critical Temperature Shutdown becomes active whenever temperature goes outside • Shutdown Mode to Minimize Power a programmable window, while a separate Critical Consumption Temperature Alarm (T_CRIT_A) output becomes • Up to 4 LM77s Can be Connected to a Single active when the temperature exceeds a Bus programmable critical limit. The INT output can operate in either a comparator or event mode, while • 9-bit + Sign Output; Full-Scale Reading of Over the T_CRIT_A output operates in comparator mode 128°C only. • SOIC and VSSOP 8-lead Packages The host can program both the upper and lower limits of the window as well as the critical temperature limit. APPLICATIONS Programmable hysterisis as well as a fault queue are • System Thermal Management available to minimize false tripping. Two pins (A0, A1) are available for address selection. The sensor • Personal Computers powers up with default thresholds of 2°C THYST, 10°C • Office Electronics TLOW, 64°C THIGH, and 80°C T_CRIT. • Electronic Test Equipment The LM77's 3.0V to 5.5V supply voltage range, Serial • Automotive Bus interface, 9-bit + sign output, and full-scale range • HVAC of over 128°C make it ideal for a wide range of applications. These include thermal management and KEY SPECIFICATIONS protection applications in personal computers, electronic test equipment, office electronics, • Supply Voltage 3.0V to 5.5V automotive, and HVAC applications. • 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) 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 1999–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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