LM95234 ±2°C Quad Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface | TI.com

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±2°C Quad Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface



LM95234 is an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) interface that can very accurately monitor the temperature of four remote diodes as well as its own temperature that includes patent pending remote diode TruTherm BJT beta compensation beta compensation technology. The four remote diodes can be external devices such as microprocessors, graphics processors or diode-connected 2N3904s. The LM95234's TruTherm BJT beta compensation technology allows sensing of 90 nm or 65 nm process thermal diodes accurately.

The LM95234 reports temperature in two different formats for +127.875°C/–128°C range and 0°C/255°C range. The LM95234 TCRIT1, TCRIT2 and TCRIT3 outputs are triggered when any unmasked channel exceeds its corresponding programmable limit and can be used to shutdown the system, to turn on the system fans or as a microcontroller interrupt function. The current status of the TCRIT1, TCRIT2 and TCRIT3 pins can be read back from the status registers. Mask registers are available for further control of the TCRIT outputs.

Two LM95234 remote temperature channels have programmable digital filters while the other two remote channels utilize a fault-queue to minimize unwanted TCRIT events when temperature spikes are encountered.

For optimum flexibility and accuracy, each LM95234 channel includes registers for sub-micron process or 2N3904 diode model selection as well as offset correction. A three-level address pin allows connection of up to 3 LM95234s to the same SMBus master. The LM95234 includes power saving functions such as: programmable conversion rate, shutdown mode, and disabling of unused channels.


  • Accurately Senses Die Temperature of 4 Remote ICs or Diode Junctions and Local Temperature
  • TruTherm BJT Beta Compensation Technology Accurately Senses Sub-micron Process Thermal Diodes
  • Programmable Digital Filters and Analog Front End Filter
  • 0.125°C LSb Temperature Resolution
  • 0.03125°C LSb Remote Temperature Resolution with Digital Filter Enabled
  • +127.875°C/–128°C and 0°C/255°C Remote Ranges
  • Remote Diode Fault Detection, Model Selection and Offset Correction
  • Mask and Status Register Support
  • 3 Programmable TCRIT Outputs with Programmable Shared Hysteresis and Fault-Queue
  • Programmable Conversion Rate and Shutdown Mode One-shot Conversion Control
  • SMBus 2.0 Compatible Interface, Supports TIMEOUT
  • Three-level Address Pin
  • 14-pin WSON Package

Key Specifications

  • Local Temperature Accuracy ±2.0°C (max)
  • Remote Diode Temperature Accuracy ±0.875°C (max)
  • Supply Voltage 3.0V to 3.6V
  • Average Supply Current (1Hz conversion rate)

TruTherm is a trademark of Texas Instruments. All trademarks are the property of their respective owners.


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Part number Order Device type Interface Local sensor accuracy (Max) (+/- C) Temp resolution (Max) (bits) Operating temperature range (C) Supply voltage (Min) (V) Supply voltage (Max) (V) Supply current (Max) (uA) Features Remote channels (#) Addresses Rating Package Group Package size: mm2:W x L (PKG) Approx. price (US$)
LM95234 Order now Remote     I2C, SMBus, 2-Wire     2     11     -40 to 140     2.7     5.5     800     One-shot conversion
4     3     Catalog     WSON | 14     14WSON: 16 mm2: 4 x 4 (WSON | 14)     1.03 | 1ku    
TMP423 Order now Remote     I2C, SMBus, 2-Wire     2.5     12     -40 to 125     2.7     5.5     38     One-shot conversion     3     2     Catalog     SOT-23 | 8     8SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 8)     0.75 | 1ku    
TMP468 Order now Remote     I2C, SMBus, 2-Wire     0.35     13     -40 to 125     1.7     3.6     375     ALERT     8     4     Catalog     DSBGA | 16
VQFN | 16    
See datasheet (DSBGA)
16VQFN: 9 mm2: 3 x 3 (VQFN | 16)    
0.95 | 1ku