LM83 Triple Remote and Local Temperature Sensor with SMBus, I2C Interface and ACPI Compatible | TI.com

LM83
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Triple Remote and Local Temperature Sensor with SMBus, I2C Interface and ACPI Compatible

 

Description

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.


Features

  • 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 Voltage3.0V to 3.6V
[Solid_Square] Supply Current0.8mA (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)

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) Approx. price (US$)
LM83 Order now Remote     I2C, SMBus, 2-Wire     3     8     -40 to 125     3     3.6     800     ALERT     3     9     Catalog     SSOP | 16     16SSOP: 29 mm2: 6 x 4.9 (SSOP | 16)     2.34 | 1ku    
LM95214 Order now Remote     I2C, SMBus, 2-Wire     2     11     -40 to 140     3     3.6     800     One-shot conversion
ALERT    
4     3     Catalog     WSON | 14     14WSON: 16 mm2: 4 x 4 (WSON | 14)     1.00 | 1ku    
LM95234 Order now Remote     I2C, SMBus, 2-Wire     2     11     -40 to 140     2.7     5.5     800     One-shot conversion
ALERT    
4     3     Catalog     WSON | 14     14WSON: 16 mm2: 4 x 4 (WSON | 14)     1.03 | 1ku