Product details

Local sensor accuracy (Max) (+/- C) 3 Type Remote Operating temperature range (C) -40 to 125 Supply voltage (Min) (V) 3 Interface type I2C, SMBus Supply voltage (Max) (V) 3.6 Supply current (Max) (uA) 800 Temp resolution (Max) (bits) 8 Features ALERT Remote channels (#) 3 Addresses 9 Rating Catalog
Local sensor accuracy (Max) (+/- C) 3 Type Remote Operating temperature range (C) -40 to 125 Supply voltage (Min) (V) 3 Interface type I2C, SMBus Supply voltage (Max) (V) 3.6 Supply current (Max) (uA) 800 Temp resolution (Max) (bits) 8 Features ALERT Remote channels (#) 3 Addresses 9 Rating Catalog
SSOP (DBQ) 16 29 mm² 4.9 x 6
  • Accurately senses die temperature of 3 remote ICs, or diode junctions
  • On-board local temperature sensing
  • SMBus and I2C compatible interface, supports SMBus 1.1 TIMEOUT
  • Two interrupt outputs: INT# and T_CRIT_A#
  • Register readback capability
  • 7 bit plus sign temperature data format, 1 °C resolution
  • 2 address select pins allow connection of 9 LM83s on a single bus

Key Specifications

[Solid_Square] Supply Voltage 3.0V to 3.6V
[Solid_Square] Supply Current 0.8mA (max)
[Solid_Square] Local Temp Accuracy (includes quantization error)
0°C to +85°C ±3.0°C (max)
[Solid_Square] Remote Diode Temp Accuracy (includes quantization error)
+25°C to +100°C ±3°C (max)
0°C to +125°C ±4°C (max)

  • Accurately senses die temperature of 3 remote ICs, or diode junctions
  • On-board local temperature sensing
  • SMBus and I2C compatible interface, supports SMBus 1.1 TIMEOUT
  • Two interrupt outputs: INT# and T_CRIT_A#
  • Register readback capability
  • 7 bit plus sign temperature data format, 1 °C resolution
  • 2 address select pins allow connection of 9 LM83s on a single bus

Key Specifications

[Solid_Square] Supply Voltage 3.0V to 3.6V
[Solid_Square] Supply Current 0.8mA (max)
[Solid_Square] Local Temp Accuracy (includes quantization error)
0°C to +85°C ±3.0°C (max)
[Solid_Square] Remote Diode Temp Accuracy (includes quantization error)
+25°C to +100°C ±3°C (max)
0°C to +125°C ±4°C (max)

The LM83 is a digital temperature sensor with a 2 wire serial interface that senses the voltage and thus the temperature of three remote diodes using a Delta-Sigma analog-to-digital converter with a digital over-temperature detector. The LM83 accurately senses its own temperature as well as the temperature of three external devices, such as Pentium II® Processors or diode connected 2N3904s. The temperature of any ASIC can be detected using the LM83 as long as a dedicated diode (semiconductor junction) is available on the die. Using the SMBus interface a host can access the LM83's registers at any time. Activation of a T_CRIT_A# output occurs when any temperature is greater than a programmable comparator limit, T_CRIT. Activation of an INT# output occurs when any temperature is greater than its corresponding programmable comparator HIGH limit.

The host can program as well as read back the state of the T_CRIT register and the four T_HIGH registers. Three state logic inputs allow two pins (ADD0, ADD1) to select up to 9 SMBus address locations for the LM83. The sensor powers up with default thresholds of 127°C for T_CRIT and all T_HIGHs. The LM83 is pin for pin and register compatible with the LM84 as well as the Maxim MAX1617 and the Analog Devices ADM1021.


The LM83 is a digital temperature sensor with a 2 wire serial interface that senses the voltage and thus the temperature of three remote diodes using a Delta-Sigma analog-to-digital converter with a digital over-temperature detector. The LM83 accurately senses its own temperature as well as the temperature of three external devices, such as Pentium II® Processors or diode connected 2N3904s. The temperature of any ASIC can be detected using the LM83 as long as a dedicated diode (semiconductor junction) is available on the die. Using the SMBus interface a host can access the LM83's registers at any time. Activation of a T_CRIT_A# output occurs when any temperature is greater than a programmable comparator limit, T_CRIT. Activation of an INT# output occurs when any temperature is greater than its corresponding programmable comparator HIGH limit.

The host can program as well as read back the state of the T_CRIT register and the four T_HIGH registers. Three state logic inputs allow two pins (ADD0, ADD1) to select up to 9 SMBus address locations for the LM83. The sensor powers up with default thresholds of 127°C for T_CRIT and all T_HIGHs. The LM83 is pin for pin and register compatible with the LM84 as well as the Maxim MAX1617 and the Analog Devices ADM1021.


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Technical documentation

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Type Title Date
* Data sheet Triple-Diode Input & Local Digital Temp Sensor w/Two-Wire Interface datasheet (Rev. A) 03 May 2004
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

Design & development

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

Driver or library

LM83SW-LINUX — Linux Driver for LM83

The Linux driver supports the LM83 series of System Hardware Monitors. 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:
  • lm83
  • lm82
(...)
Package Pins Download
SSOP (DBQ) 16 View options

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