LM95231

ACTIVE

Dual Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface

Top

Product details

Parameters

Local sensor accuracy (Max) (+/- C) 3 Type Remote Operating temperature range (C) 0 to 85 Supply voltage (Min) (V) 3 Interface type I2C, SMBus Supply voltage (Max) (V) 3.6 Supply current (Max) (uA) 402 Temp resolution (Max) (bits) 10 Features One-shot conversion, ALERT Remote channels (#) 2 Addresses 3 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 Die Temperature of Remote ICs or Diode Junctions
  • Uses TruTherm Technology for Precision “Thermal Diode” Temperature Measurement
  • Thermal Diode Input Stage with Analog Filtering
  • Thermal Diode Digital Filtering
  • Intel Pentium 4 Processor on 90nm Process or 2N3904 Non-ideality Selection
  • Remote Diode Fault Detection
  • On-board Local Temperature Sensing
  • Remote Temperature Readings Without Digital Filtering:
    • 0.125°C LSb
    • 10-bits Plus Sign or 11-bits Programmable Resolution
    • 11-bits Resolves Temperatures Above
      127 °C
  • Remote Temperature Readings with Digital Filtering:
    • 0.03125°C LSb with Filtering
    • 12-bits Plus Sign or 13-bits Programmable Resolution
    • 13-bits Resolves Temperatures Above
      127°C
  • Local Temperature Readings:
    • 0.25°C
    • 9-bits Plus Sign
  • Status Register Support
  • Programmable Conversion Rate Allows User Optimization of Power Consumption
  • Shutdown Mode One-shot Conversion Control
  • SMBus 2.0 Compatible Interface, Supports TIMEOUT
  • 8-pin VSSOP Package

Key Specifications

  • Remote Temperature Accuracy ±0.75°C (max)
  • Local Temperature Accuracy ±3.0°C (max)
  • Supply Voltage 3.0V to 3.6V
  • Supply Current 402μA (typ)

All trademarks are the property of their respective owners.

open-in-new Find other Digital temperature sensors

Description

The LM95231 is a precision dual remote diode temperature sensor (RDTS) that uses Texas Instruments' TruTherm technology. The 2-wire serial interface of the LM95231 is compatible with SMBus 2.0. The LM95231 can sense three temperature zones, it can measure the temperature of its own die as well as two diode connected transistors. The LM95231 includes digital filtering and an advanced input stage that includes analog filtering and TruTherm technology that reduces processor-to-processor non-ideality spread. The diode connected transistors can be a “thermal diode” as found in Intel and AMD processors or can simply be a diode connected MMBT3904 transistor. TruTherm technology allows accurate measurement of “thermal diodes” found on small geometry processes, 90nm and below. The LM95231 supports user selectable thermal diode non-ideality of either a Pentium 4 processor on 90nm process or 2N3904.

The LM95231 resolution format for remote temperature readings can be programmed to be 11-bits signed or unsigned with the digital filtering disabled. When the filtering is enabled the resolution increases to 13-bits signed or unsigned. In the unsigned mode the LM95231 remote diode readings can resolve temperatures above 127°C. Local temperature readings have a resolution of 9-bits plus sign.

open-in-new Find other Digital temperature sensors
Download

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 5
Type Title Date
* Data sheet LM95231 Precision Dual Remote Diode Temp Sens w/SMBus Interf & TruTherm Tech datasheet (Rev. E) 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

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 LM95241
LM95241SW-LINUX The Linux driver supports the LM95241 series of Dual 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 (...)
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

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos