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LM90 - Remote Diode and Local Digital Temperature Sensor

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.

Key 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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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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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.