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LM90

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Remote and Local Temperature Sensor with SMBus Interface

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Data sheet

LM90

ACTIVE
Data sheet Order now

Product details

Local sensor accuracy (max) 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 Features ALERT Supply current (max) (µA) 1700 Temp resolution (max) (bps) 8 Remote channels (#) 1 Addresses 1 Rating Catalog
Local sensor accuracy (max) 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 Features ALERT Supply current (max) (µA) 1700 Temp resolution (max) (bps) 8 Remote channels (#) 1 Addresses 1 Rating Catalog
VSSOP (DGK) 8 14.7 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
User guide LM86, LM89, LM89-1, LM90, LM99, LM99-1 Evaluation Board User’s Guide 29 Feb 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Driver or library

LM90SW-LINUX — Linux Driver for LM90

The Linux driver supports the LM90 series of Remote and Local Temp Sensors. The Linux driver supports communication through the I2C bus and interfaces with the Hardware Monitoring sub-system.

 

Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

Supported Devices:

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Support software

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

Evaluation Board Software for Hardware Monitors and Digital Temperature Sensors
Supported products & hardware

Supported products & hardware

Products
Digital temperature sensors
LM63 — 1 remote and local temperature sensor with fan control LM64 — 1 remote and local temp sensor with fan control and 5 GPIO's LM71 — ±1.5°C Temperature Sensor with SPI Interface LM71-Q1 — Automotive Grade, ±1.5°C Temperature Sensor with SPI Interface LM73 — ±1°C Temperature Sensor with I2C/SMBus Interface LM86 — ±0.75°C remote and local temperature sensor with SMBus interface LM89 — ±0.75°C remote and local temperature sensor with SMBus interface and 2 addresses for bus sharing LM90 — Remote and Local Temperature Sensor with SMBus Interface LM93 — 2 remote, 1 local temp sensor with hardware monitor and 16 power supply voltage monitors LM95010 — ±2°C Temperature Sensor with SensorPath Interface LM95071 — ±1°C Temperature Sensor with SPI Interface LM95221 — ±3°C dual remote & local temperature sensor with beta compensation and SMBus, I2C LM95231 — Dual Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface LM95235 — ±0.75°C remote & local temperature sensor with SMBus, beta compensation for 65/90n LM95235-Q1 — Automotive Grade, ±2°C Remote and Local Temperature Sensor with TruTherm Technology and SMBus LM96000 — Hardware monitor with fan control and 6 power supply voltage monitors LM96080 — 1 local temp sensor with fan speed and power supply voltage monitor LM96163 — 1 remote and local temp sensor with beta compensation and fan control LM99 — Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface
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Support software

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.

  • Download SensorEval Software and Manual
  • Windows XP support is offered for (...)
Supported products & hardware

Supported products & hardware

Products
Digital temperature sensors
LM63 — 1 remote and local temperature sensor with fan control LM64 — 1 remote and local temp sensor with fan control and 5 GPIO's LM71 — ±1.5°C Temperature Sensor with SPI Interface LM71-Q1 — Automotive Grade, ±1.5°C Temperature Sensor with SPI Interface LM73 — ±1°C Temperature Sensor with I2C/SMBus Interface LM75A — 2C industry standard temperature sensor, I2C/SMBus interface LM86 — ±0.75°C remote and local temperature sensor with SMBus interface LM89 — ±0.75°C remote and local temperature sensor with SMBus interface and 2 addresses for bus sharing LM90 — Remote and Local Temperature Sensor with SMBus Interface LM93 — 2 remote, 1 local temp sensor with hardware monitor and 16 power supply voltage monitors LM95010 — ±2°C Temperature Sensor with SensorPath Interface LM95071 — ±1°C Temperature Sensor with SPI Interface LM95172-Q1 — Automotive Grade, ±1°C Temperature Sensor with 200°C Capability and SPI Interface LM95214 — ±2°C Quad Remote and Local Temperature Sensor with SMBus Interface LM95221 — ±3°C dual remote & local temperature sensor with beta compensation and SMBus, I2C LM95231 — Dual Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface LM95233 — ±2°C Dual Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface LM95234 — ±2°C Quad Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface LM95235 — ±0.75°C remote & local temperature sensor with SMBus, beta compensation for 65/90n LM95235-Q1 — Automotive Grade, ±2°C Remote and Local Temperature Sensor with TruTherm Technology and SMBus LM95241 — ±1.25°C dual remote & local temperature sensor with beta compensation and SMBus, I LM95245 — ±0.75°C remote & local temperature sensor with SMBus, beta compensation for 45nm d LM96000 — Hardware monitor with fan control and 6 power supply voltage monitors LM96080 — 1 local temp sensor with fan speed and power supply voltage monitor LM96163 — 1 remote and local temp sensor with beta compensation and fan control LM99 — Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface
Precision ADCs
ADC128D818 — 12-Bit, 82SPS, 8-Ch Delta-Sigma ADC with Temp Sensor, INT / EXT Voltage Reference & I2C Interface
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VSSOP (DGK) 8 Ultra Librarian
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