LM83

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




Application

·System Thermal Management
· Computers
·Electronic Test Equipment
· Office Electronics
· HVAC




Specifications

Supply Voltage .....................................................................................−0.3 V to 6.0 V
Voltage at Any Pin ........................................................................................−0.3 V to
(V_CC + 0.3 V)
D− Input Current .............................................................................................±1 mA
Input Current at All Other Pins (Note2) ..............................................................5 mA
Package Input Current (Note 2) .......................................................................20 mA
SMBData, T_CRIT_A, INT Output
Sink Current .....................................................................................................10 mA
SMBCLK, SMBData, T_CRIT_A, INT
Output Voltage ..................................................................................................6.0 V
Storage Temperature ...................................................................−65°C to +150°C
Soldering Information, Lead Temperature
QSOP Package (Note 3)
Vapor Phase (60 seconds) .............................................................................215°C
Infrared (15 seconds) ....................................................................................220°C
ESD Susceptibility (Note 4)
Human Body Model ........................................................................................2000 V
Machine Model .................................................................................................200 V

Remote Diode Thermal Sensors	3
Temperature Accuracy (+/-)	3 deg C
Supply Min	3 Volt
Quiescent Current	0.8 mA
Temperature Min	-40 deg C
Temperature Max	125 deg C
Interface Type	2-Wire Serial
Programmable Setpoints	Yes
Resolution	8 bits
Resolution degC/LSB	1
Supply Max	3.6 Volt
Shut down	No
Interrupt Outputs	2
Fault Queue	No
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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.