Remote Diode and Local Digital Temperature Sensor with  Two-Wire Interface - LM82

LM82 (ACTIVE)

Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface

Recommended alternative parts

  • LM95213  -  Dual Remote Diode Sensor
  • LM95214  -  Quad Remote Diode Sensor
  • LM95235  -  Smaller Package Part With TruTherm(TM) Support
  • LM95235-Q1  -  Smaller Package Part With TruTherm(TM) Support

Description

The LM82 is a digital temperature sensor with a 2 wire serial interface that senses the voltage and thus the temperature of a remote diode using a Delta-Sigma analog-to-digital converter with a digital over-temperature detector. The LM82 accurately senses its own temperature as well as the temperature of external devices, such as Pentium II Processors or diode connected 2N3904s. The temperature of any ASIC can be detected using the LM82 as long as a dedicated diode (semiconductor junction) is available on the die. Using the SMBus interface a host can access the LM82'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 2 T_HIGH registers. Three state logic inputs allow two pins (ADD0, ADD1) to select up to 9 SMBus address locations for the LM82. The sensor powers up with default thresholds of 127°C for T_CRIT and all T_HIGHs. The LM82 is pin for pin and register compatible with the LM84, Maxim MAX1617 and Analog Devices ADM1021.

Features

  • Accurately Senses Die Temperature of 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 LM82s on a Single Bus

Key Specifications

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

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Parametrics Compare all products in Remote Temperature Sensors

 
Interface
Pin/Package
Shutdown
Approx. Price (US$)
Operating Temperature Range (C)
Rating
Remote Channel
Special Features
Remote Sensor Correction
Temp Range for Listed Accuracy (C)
Programmable Alert
Remote Diode Temp Range for Listed Accuracy (C)
LM82 LM95213 LM95214 LM95235 LM95235-Q1
SMBus
I2C    
SMBus     SMBus     SMBus     SMBus    
16SSOP     14WSON     14WSON     8VSSOP     8VSSOP    
No     Yes     Yes     Yes     Yes    
2.03 | 1ku     0.87 | 1ku     1.00 | 1ku     0.74 | 1ku     1.29 | 1ku    
-40 to 125     -40 to 140     -40 to 140     -40 to 90
0 to 90    
-40 to 85    
Catalog     Catalog     Catalog     Catalog     Automotive    
1     2     4     1     1    
Remote diode fault detection     Programmable conversion rate
One shot conversion control
Remote diode fault detection
Thermal diode input stage filtering    
Programmable conversion rate
One shot conversion control
Remote diode fault detection
Thermal diode input stage filtering    
Programmable conversion rate
One shot conversion control
Remote diode fault detection
Thermal diode input stage filtering    
Programmable conversion rate
One shot conversion control
Remote diode fault detection
Thermal diode input stage filtering    
  Offset Correction Register     Offset Correction Register     Beta Compensation
TruTherm    
Beta Compensation
TruTherm    
0 to 85     -40 to 125     -40 to 125     25 to 100     25 to 100    
Yes     Yes     Yes     Yes     Yes    
0 to 100     60 to 100     60 to 100     60 to 100     60 to 100    

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