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

±1°C Remote and Local Temperature Sensor with SMBus, I2C Interface - LM84
 

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)

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Parametrics Compare all products in Digital Temperature Sensors

 
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 LM95213 LM95214 LM95233 LM95234 LM95235 LM95235-Q1
Remote     Remote     Remote     Remote     Remote     Remote     Remote    
I2C
SMBus    
I2C
SMBus    
I2C
SMBus    
I2C
SMBus    
I2C
SMBus    
I2C
SMBus    
I2C
SMBus    
1     2     2     2     2     2     2    
8     11     11     11     11     11     11    
0 to 125     -40 to 140     -40 to 140     -40 to 140     -40 to 140     -40 to 90
0 to 90    
-40 to 85    
3     3     3     3     2.7     3     2.7    
3.6     3.6     3.6     3.6     5.5     5.5     5.5    
1000     800     800     500     800     650     350    
Programmable Alert
Remote diode fault detection    
One shot conversion control
Programmable Alert
Programmable conversion rate
Remote diode fault detection
Shutdown
Thermal diode input stage filtering    
One shot conversion control
Programmable Alert
Programmable conversion rate
Remote diode fault detection
Shutdown
Thermal diode input stage filtering    
One shot conversion control
Programmable Alert
Programmable conversion rate
Remote diode fault detection
Shutdown
Thermal diode input stage filtering    
One shot conversion control
Programmable Alert
Programmable conversion rate
Remote diode fault detection
Shutdown
Thermal diode input stage filtering    
One shot conversion control
Programmable Alert
Programmable conversion rate
Remote diode fault detection
Shutdown
Thermal diode input stage filtering    
One shot conversion control
Programmable Alert
Programmable conversion rate
Remote diode fault detection
Shutdown
Thermal diode input stage filtering    
1     2     4     2     4     1     1    
9     3     3     3     3     3     3    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Automotive    
SSOP     WSON     WSON     WSON     WSON     VSSOP     VSSOP    
16SSOP: 29 mm2: 6 x 4.9(SSOP)     See datasheet (WSON)     See datasheet (WSON)     See datasheet (WSON)     See datasheet (WSON)     8VSSOP: 15 mm2: 4.9 x 3(VSSOP)     8VSSOP: 15 mm2: 4.9 x 3(VSSOP)