Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface

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Product details

Parameters

Local sensor accuracy (Max) (+/- C) 3 Type Remote Operating temperature range (C) 0 to 85 Supply voltage (Min) (V) 2.7 Interface type I2C, SMBus Supply voltage (Max) (V) 5.5 Supply current (Max) (uA) 1700 Temp resolution (Max) (bits) 8 Features One-shot conversion, ALERT Remote channels (#) 1 Addresses 2 Rating Catalog open-in-new Find other Digital temperature sensors

Package | Pins | Size

VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new Find other Digital temperature sensors

Features

  • Accurately Senses the Temperature of Remote Diodes
  • Offset Register Allows Use of a Variety of Thermal Diodes
  • On-board Local Temperature Sensing
  • 10 Bit Plus Sign Remote Diode Temperature Data Format, 0.125 °C Resolution
  • T_CRIT_A Output Useful for System Shutdown
  • ALERT Output Supports SMBus 2.0 Protocol
  • SMBus 2.0 Compatible Interface, Supports TIMEOUT
  • 8-Pin VSSOP Package

Key Specifications

  • Supply Voltage 3.0 V to 3.6 V
  • Supply Current 0.8 mA (typ)
  • Local Temp Accuracy
    (Includes Quantization error)
    • TA = 25°C to 125°C ±3.0°C (Max)
  • Remote Diode Temp Accuracy
    (Includes Quantization Error)
    • TA = 30°C to 50°C, TD = 120°C to 140°C ±1.0°C (Max)
    • TA = 0°C to 85°C, TD = 25°C to 140°C ±3.0°C (Max)

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Description

The LM99 is an 11-bit remote diode temperature sensor with a 2-wire System Management Bus (SMBus) serial interface. The LM99 accurately measures: (1) its own temperature and (2) the temperature of a remote diode-connected transistor such as the 2N3904 or a thermal diode commonly found on Graphics Processor Units (GPU), Computer Processor Units (CPU or other ASICs. The LM99 remote diode temperature sensor shifts the temperature from the remote sensor down 16°C and operates on that shifted temperature:

  TACTUAL DIODE JUNCTION = TLM99 + 16°C

The local temperature reading requires no offset.

The LM99 has an Offset Register which provides a means for precise matching to various thermal diodes.

The LM99 and LM99-1 have the same functions but different SMBus slave addresses. This allows for one of each to be on the same bus at the same time.

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.

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Technical documentation

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Type Title Date
* Data sheet LM99 Accurate High Temp, Remote Diode Temp Sensor w/Two-Wire Interface datasheet (Rev. D) Mar. 22, 2013
Technical article How to choose the right thermistor for your temperature sensing application Feb. 13, 2020
Technical article How to enable thermal safety for automotive infotainment and cluster systems Oct. 15, 2019
Technical article Driving industrial innovation with small-size sensors Sep. 12, 2019
Technical article How to select a temperature sensor probe Feb. 18, 2016
User guide LM86, LM89, LM89-1, LM90, LM99, LM99-1 Evaluation Board User’s Guide Feb. 29, 2012

Design & development

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

Software development

DRIVER OR LIBRARY Download
Eval Board Software for Hardware Monitors and Digital Temp Sensors
DIGITALTEMPSENSORSEVM-SW — Evaluation Board Software for Hardware Monitors and Digital Temperature Sensors
DRIVER OR LIBRARY Download
Linux Driver for LM90
LM90SW-LINUX 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:

  • lm90 (...)
DRIVER OR LIBRARY Download
Eval Board Software For Hardware Monitors And Digital Temperature Sensors
SENSOREVAL 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 (...)

CAD/CAE symbols

Package Pins Download
VSSOP (DGK) 8 View options

Ordering & quality

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