Features • 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 LM92s can be connected to a single bus • 12-bit + sign output • Operation up to 150°C Description The LM92 is a digital temperature sensor and thermal window comparator with an I2C™ 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 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 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. Key Specification Supply Voltage 2.7V to 5.5V Supply Current operating 350 µA (typ) 625 µA (max) shutdown 5 µA (typ) Temperature 30°C ±0.33°C (max) Accuracy 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 Applications • HVAC • Medical Electronics • Electronic Test Equipment • System Thermal Management • Personal Computers • Office Electronics • Automotive

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Typical Application click for larger image	Block Diagram click for larger image
Typical Performance click for larger image

Datasheet

Title		Size	Date	Other Language
	LM92 ±0.33°C Accurate, 12-Bit + Sign Temperature Sensor and Thermal Window Comparator with Two-Wire Interface	811 Kbytes	11-Mar-05	日本語

Featured Application Notes

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Design Tools

Title	Size	Date
LMxx - Windows 95/98 VXD drivers with stand alone application for talking to temperature sensors or hardware monitors on a mother board	1366 Kbytes	28-Jul-2003

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM92CIM	CS065	2	38968	52	0	4402000	1	1249079519

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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