LM90

LM90 www.ti.com SNIS126A – MAY 2004 – REVISED MARCH 2013 LM90 ±3°C Accurate, Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface Check for Samples: LM90 FEATURES 1 Accurately Senses Die Temperature of Remote ICs or Diode Junctions Offset Register Allows Sensing a Variety of Thermal Diodes Accurately On-board Local Temperature Sensing 10 Bit Plus Sign Remote Diode Temperature Data Format, 0.125°C Resolution Diode Fault Detection Circuitry T_CRIT_A Output Useful for System Shutdown (Open Diode does not Activate T_CRIT_A) ALERT Output Supports SMBus 2.0 Protocol SMBus 2.0 Compatible Interface, Supports TIMEOUT 8-pin VSSOP Package APPLICATIONS System Thermal Management (e.g. Laptop, Desktop, Workstations, Server) Electronic Test Equipment Office Electronics 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...