LM84 ±1°C Remote and Local Temperature Sensor with SMBus, I2C Interface | TI.com

LM84 (ACTIVE) ±1°C Remote and Local Temperature Sensor with SMBus, I2C Interface

 

Description

The LM84 is a remote diode temperature sensor, Delta-Sigma analog-to-digital converter, and digital over-temperature detector with an SMBus™ interface. The LM84 senses its own temperature as well as the temperature of a target IC with a diode junction, such as a Pentium® II processor or a diode connected 2N3904. A diode junction (semiconductor junction) is required on the target IC's die. A host can query the LM84 at any time to read the temperature of this diode as well as the temperature state of the LM84 itself. A T_CRIT_A# interrupt output becomes active when the temperature is greater than a programmable comparator limit, T_CRIT.

The host can program as well as read back the state of the T_CRIT register. Three state logic inputs allow two pins (ADD0, ADD1) to select up to 9 SMBus address locations for the LM84. The sensor powers up with default thresholds of 127°C for T_CRIT.


Features

  • Directly senses die temperature of remote ICs
  • Senses temperature of remote diodes
  • SMBus compatible interface, supports SMBus Timeout
  • Register readback capability
  • 7 bit plus sign temperature data format
  • 2 address select lines enable 9 LM84s to be connected to a single bus

Key Specifications

Supply Voltage3.0V - 3.6V
Supply Current1 mA (max)
Local Temperature Accuracy±1.0°C (typ)
Remote Diode Temperature Accuracy 
+60°C to +100°C±3°C (max)
0°C to +125°C±5°C (max)

Parametrics

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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)
LM84 Order now Remote     I2C, SMBus, 2-Wire     1     8     0 to 125     3     3.6     1000     Programmable Alert
Remote diode fault detection    
1     9     Catalog     SSOP | 16     16SSOP: 29 mm2: 6 x 4.9 (SSOP | 16)    
LM95213 Samples not available Remote     I2C, SMBus, 2-Wire     2     11     -40 to 140     3     3.6     800     One shot conversion control
Programmable Alert
Programmable conversion rate
Remote diode fault detection
Shutdown
Thermal diode input stage filtering    
2     3     Catalog     WSON | 14     See datasheet (WSON)    
LM95214 Order now Remote     I2C, SMBus, 2-Wire     2     11     -40 to 140     3     3.6     800     One shot conversion control
Programmable Alert
Programmable conversion rate
Remote diode fault detection
Shutdown
Thermal diode input stage filtering    
4     3     Catalog     WSON | 14     See datasheet (WSON)    
LM95233 Order now Remote     I2C, SMBus, 2-Wire     2     11     -40 to 140     3     3.6     500     One shot conversion control
Programmable Alert
Programmable conversion rate
Remote diode fault detection
Shutdown
Thermal diode input stage filtering    
2     3     Catalog     WSON | 14     See datasheet (WSON)    
LM95234 Order now Remote     I2C, SMBus, 2-Wire     2     11     -40 to 140     2.7     5.5     800     One shot conversion control
Programmable Alert
Programmable conversion rate
Remote diode fault detection
Shutdown
Thermal diode input stage filtering    
4     3     Catalog     WSON | 14     See datasheet (WSON)    
LM95235 Order now Remote     I2C, SMBus, 2-Wire     2     11     -40 to 90
0 to 90    
3     5.5     650     One shot conversion control
Programmable Alert
Programmable conversion rate
Remote diode fault detection
Shutdown
Thermal diode input stage filtering    
1     3