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LM90 Datasheet(PDF) 1 Page - Texas Instruments |
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LM90 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 32 page LM90 www.ti.com SNIS126A – MAY 2004 – REVISED MARCH 2013 LM90 ±3°C Accurate, Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface Check for Samples: LM90 1 FEATURES DESCRIPTION The LM90 is an 11-bit digital temperature sensor with • Accurately Senses Die Temperature of Remote a 2-wire System Management Bus (SMBus) serial ICs or Diode Junctions interface. The LM90 accurately measures its own • Offset Register Allows Sensing a Variety of temperature as well as the temperature of an external Thermal Diodes Accurately device, such as processor thermal diode or diode connected transistor such as the 2N3904. The • On-board Local Temperature Sensing temperature of any ASIC can be accurately • 10 Bit Plus Sign Remote Diode Temperature determined using the LM90 as long as a dedicated Data Format, 0.125°C Resolution diode (semiconductor junction) is available on the • Diode Fault Detection Circuitry target die. The LM90 remote sensor accuracy of ±3°C is factory trimmed for the 1.008 typical non-ideality • T_CRIT_A Output Useful for System Shutdown factor of the mobile Pentium III thermal diode. The (Open Diode does not Activate T_CRIT_A) LM90 has an Offset register to allow measuring other • ALERT Output Supports SMBus 2.0 Protocol diodes without requiring continuous software • SMBus 2.0 Compatible Interface, Supports management. TIMEOUT Activation of the ALERT output occurs when any • 8-pin VSSOP Package temperature goes outside a preprogrammed window set by the HIGH and LOW temperature limit registers APPLICATIONS or exceeds the T_CRIT temperature limit. Activation of the T_CRIT_A occurs when any temperature • System Thermal Management exceeds the T_CRIT programmed limit. The LM90 is (e.g. Laptop, Desktop, Workstations, Server) pin and register compatible with the LM86, Analog • Electronic Test Equipment Devices ADM1032 and Maxim MAX6657/8. • Office Electronics KEY SPECIFICATIONS • Supply Voltage 3.0 to 3.6 V • Supply Current 0.8 mA (Typ) • Local Temp Accuracy (Includes Quantization Error) – TA=25°C to 125°C, ±4.0 °C (Max) • Remote Diode Temp Accuracy (Includes Quantization Error) – TA=30°C to 50°C, TD=60°C to 100°C, ±3.0 °C (Max) – TA=0°C to 85°C, TD=25°C to 125°C, ±4.0 °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. PRODUCTION DATA information is current as of publication date. Copyright © 2004–2013, 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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