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 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 В±3В°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. 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 …
