LM84

ACTIVO

Sensor de temperatura local y remoto de ±1 °C con interfaz SMBus e I2C

Detalles del producto

Local sensor accuracy (max) 1 Type Remote Operating temperature range (°C) 0 to 125 Interface type I2C, SMBus Features ALERT Supply current (max) (µA) 1000 Temp resolution (max) (bps) 8 Remote channels (#) 1 Addresses 9 Rating Catalog
Local sensor accuracy (max) 1 Type Remote Operating temperature range (°C) 0 to 125 Interface type I2C, SMBus Features ALERT Supply current (max) (µA) 1000 Temp resolution (max) (bps) 8 Remote channels (#) 1 Addresses 9 Rating Catalog
SSOP (DBQ) 16 29.4 mm² (4.9 mm × 6 mm)
  • 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)

  • 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)

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.


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.


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Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos LM84 Diode Input Digital Temperature Sensor with Two-Wire Interface datasheet (Rev. B) 3/05/2004

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