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LM90

National Semiconductor
Part Number LM90
Manufacturer National Semiconductor
Description Remote Diode and Local Digital Temperature Sensor
Published Apr 26, 2015
Detailed Description LM90 ±3˚C Accurate, Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface February 2002 LM90 ±3˚C ...
Datasheet PDF File LM90 PDF File

LM90
LM90


Overview
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.
008 typical non-ideality factor of the mobile Pentium™ III thermal diode.
The LM90 has an Offset register to allow measuring other diodes without requiring continuous software management.
Contact hardware.
monitor.
team@nsc.
com to obtain the latest data for new processors.
Activation of the ALERT output occurs when any temperature goes outside a preprogrammed window set by the HIGH and LOW temperature limit registers or exceeds the T_CRIT temperature limit.
Activation of the T_CRIT_A occurs when any temperature exceeds the T_CRIT programmed limit.
The LM90 is pin and register compatible with the LM86, Analog Devices ADM1032 and Maxim MAX6657/8.
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 TIMEOUT n 8-pin MSOP packages Key Specifications j Supply Voltage 3.
0V to 3.
6V j Supply Current 0.
8mA (typ) j Local Temp Accurac...


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