Product details

Local sensor accuracy (Max) (+/- C) 4 Type Remote Operating temperature range (C) 0 to 125 Supply voltage (Min) (V) 3 Interface type I2C, SMBus Supply voltage (Max) (V) 3.6 Supply current (Max) (uA) 1700 Temp resolution (Max) (bits) 8 Features ALERT Remote channels (#) 1 Addresses 1 Rating Catalog
Local sensor accuracy (Max) (+/- C) 4 Type Remote Operating temperature range (C) 0 to 125 Supply voltage (Min) (V) 3 Interface type I2C, SMBus Supply voltage (Max) (V) 3.6 Supply current (Max) (uA) 1700 Temp resolution (Max) (bits) 8 Features ALERT Remote channels (#) 1 Addresses 1 Rating Catalog
VSSOP (DGK) 8 15 mm² 3 x 4.9
  • Accurately Senses Die Temperature of Remote ICs or Diode Junctions
  • Offset Register Allows Sensing a Variety of Thermal Diodes Accurately
  • On-board Local Temperature Sensing
  • 10 Bit Plus Sign Remote Diode Temperature Data Format, 0.125°C Resolution
  • Diode Fault Detection Circuitry
  • T_CRIT_A Output Useful for System Shutdown (Open Diode does not Activate T_CRIT_A)
  • ALERT Output Supports SMBus 2.0 Protocol
  • SMBus 2.0 Compatible Interface, Supports TIMEOUT
  • 8-pin VSSOP Package

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)

  • Accurately Senses Die Temperature of Remote ICs or Diode Junctions
  • Offset Register Allows Sensing a Variety of Thermal Diodes Accurately
  • On-board Local Temperature Sensing
  • 10 Bit Plus Sign Remote Diode Temperature Data Format, 0.125°C Resolution
  • Diode Fault Detection Circuitry
  • T_CRIT_A Output Useful for System Shutdown (Open Diode does not Activate T_CRIT_A)
  • ALERT Output Supports SMBus 2.0 Protocol
  • SMBus 2.0 Compatible Interface, Supports TIMEOUT
  • 8-pin VSSOP Package

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)

The LM90 is an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) serial interface. The LM90 accurately measures its own temperature as well as the temperature of an external device, such as processor thermal diode or diode connected transistor such as the 2N3904. The temperature of any ASIC can be accurately determined using the LM90 as long as a dedicated diode (semiconductor junction) is available on the target die. The LM90 remote sensor accuracy of ±3°C is factory trimmed for the 1.008 typical non-ideality factor of the mobile Pentium III thermal diode. The LM90 has an Offset register to allow measuring other diodes without requiring continuous software management.

Activation of the ALERT output occurs when any temperature goes outside a preprogrammed window set by the HIGH and LOW temperature limit registers or exceeds the T_CRIT temperature limit. Activation of the T_CRIT_A occurs when any temperature exceeds the T_CRIT programmed limit. The LM90 is pin and register compatible with the LM86, Analog Devices ADM1032 and Maxim MAX6657/8.

The LM90 is an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) serial interface. The LM90 accurately measures its own temperature as well as the temperature of an external device, such as processor thermal diode or diode connected transistor such as the 2N3904. The temperature of any ASIC can be accurately determined using the LM90 as long as a dedicated diode (semiconductor junction) is available on the target die. The LM90 remote sensor accuracy of ±3°C is factory trimmed for the 1.008 typical non-ideality factor of the mobile Pentium III thermal diode. The LM90 has an Offset register to allow measuring other diodes without requiring continuous software management.

Activation of the ALERT output occurs when any temperature goes outside a preprogrammed window set by the HIGH and LOW temperature limit registers or exceeds the T_CRIT temperature limit. Activation of the T_CRIT_A occurs when any temperature exceeds the T_CRIT programmed limit. The LM90 is pin and register compatible with the LM86, Analog Devices ADM1032 and Maxim MAX6657/8.

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Technical documentation

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Type Title Date
* Data sheet LM90 +-;3C Accurate, Remote Diode & Local Dig Temp Sensor w/2-Wire Interface datasheet (Rev. A) 25 Mar 2013
Technical article How to choose the right thermistor for your temperature sensing application 13 Feb 2020
Technical article How to enable thermal safety for automotive infotainment and cluster systems 15 Oct 2019
Technical article Driving industrial innovation with small-size sensors 12 Sep 2019
Technical article How to select a temperature sensor probe 18 Feb 2016
User guide LM86, LM89, LM89-1, LM90, LM99, LM99-1 Evaluation Board User’s Guide 29 Feb 2012

Design & development

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Driver or library

DIGITALTEMPSENSORSEVM-SW — Eval Board Software for Hardware Monitors and Digital Temp Sensors

Evaluation Board Software for Hardware Monitors and Digital Temperature Sensors
Driver or library

SENSOREVAL — Eval Board Software For Hardware Monitors And Digital Temperature Sensors

SensorEval
SensorEval software supports the latest TI temperature sensor and hardware monitor evaluation boards via USB interface. It also allows access to sensors mounted directly on motherboards that support Intel chip sets.

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