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LM90 - Remote Diode and Local Digital Temperature Sensor

Datasheet Summary

Description

The LM90 is an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) serial interface.

The LM90 accurately measures its own temperature as well as the temperature of an external device, such as processor thermal diode or diode connected transistor such as the 2N3904.

Features

  • n Accurately senses die temperature of remote ICs or diode junctions n Offset register allows sensing a variety of thermal diodes accurately n On-board local temperature sensing n 10 bit plus sign remote diode temperature data format, 0.125 ˚C resolution n Diode fault detection circuitry n T_CRIT_A output useful for system shutdown (open diode does not activate T_CRIT_A) n ALERT output supports SMBus 2.0 protocol n SMBus 2.0 compatible interface, supports.

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Datasheet Details

Part number LM90
Manufacturer National Semiconductor
File Size 339.55 KB
Description Remote Diode and Local Digital Temperature Sensor
Datasheet download datasheet LM90 Datasheet
Additional preview pages of the LM90 datasheet.

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LM90 ±3˚C Accurate, Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface February 2002 LM90 ±3˚C Accurate, Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface General Description The LM90 is an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) serial interface. The LM90 accurately measures its own temperature as well as the temperature of an external device, such as processor thermal diode or diode connected transistor such as the 2N3904. The temperature of any ASIC can be accurately determined using the LM90 as long as a dedicated diode (semiconductor junction) is available on the target die. The LM90 remote sensor accuracy of ±3˚C is factory trimmed for the 1.
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