LM82

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SNIS113D – JANUARY 2000 – REVISED MARCH 2013

LM82 Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface

Check for Samples: LM82

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FEATURES

DESCRIPTION

The LM82 is a digital temperature sensor with a 2

2

•

Accurately Senses Die Temperature of Remote

wire serial interface that senses the voltage and thus

ICs, or Diode Junctions

the temperature of a remote diode using a Delta-

•

On-board Local Temperature Sensing

Sigma analog-to-digital converter with a digital over-

•

temperature detector. The LM82 accurately senses

its own temperature as well as the temperature of

SMBus 1.1 TIMEOUT

external devices, such as Pentium II Processors or

•

Two Interrupt Outputs: INT and T_CRIT_A

diode connected 2N3904s. The temperature of any

•

Register Readback Capability

ASIC can be detected using the LM82 as long as a

•

7 bit Plus Sign Temperature Data Format, 1°C

dedicated diode (semiconductor junction) is available

on the die. Using the SMBus interface a host can

Resolution

access the LM82's registers at any time. Activation of

•

2 Address Select Pins Allow Connection of 9

a T_CRIT_A output occurs when any temperature is

LM82s on a Single Bus

greater

than

a

programmable

comparator

limit,

T_CRIT. Activation of an INT output occurs when any

APPLICATIONS

temperature

is

greater

than

its

corresponding

programmable comparator HIGH limit.

•

System Thermal Management

•

Computers

The host can program as well as read back the state

of the T_CRIT register and the 2 T_HIGH registers.

•

Electronic Test Equipment

Three state logic inputs allow two pins (ADD0, ADD1)

•

Office Electronics

to select up to 9 SMBus address locations for the

•

HVAC

LM82. The sensor powers up with default thresholds

of 127°C for T_CRIT and all T_HIGHs. The LM82 is

KEY SPECIFICATIONS

pin for pin and register compatible with the LM84,

Maxim MAX1617 and Analog Devices ADM1021.

•

Supply Voltage: 3.0 to 3.6V

•

Supply Current: 0.8mA (max)

•

Local Temp Accuracy (includes quantization

error):

–

0 to +85 ±3.0°C (max)

•

Remote Diode Temp Accuracy (includes

quantization error):

–

+25°C to +100°C ±3°C (max)

–

0°C to +125°C ±4°C (max)

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PRODUCTION DATA information is current as of publication date.

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Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.