Datasheet

LM95221
www.ti.com SNIS134B –MAY 2004–REVISED MARCH 2013
The additional inaccuracy in the temperature measurement caused by η, can be eliminated if each temperature
sensor is calibrated with the remote diode that it will be paired with.
Processor Family η, non-ideality Series R
min typ max
Pentium II 1 1.0065 1.0173
Pentium III CPUID 67h 1 1.0065 1.0125
Pentium III CPUID 1.0057 1.008 1.0125
68h/PGA370Socket/Celeron
Pentium 4, 423 pin 0.9933 1.0045 1.0368
Pentium 4, 478 pin 0.9933 1.0045 1.0368
Pentium 4 on 0.13 micron process, 1.0011 1.0021 1.0030 3.64 Ω
2-3.06GHz
Pentium 4 on 90 nm process 1.011 3.33 Ω
Pentium M Processor (Centrino) 1.00151 1.00220 1.00289 3.06 Ω
MMBT3904 1.003
AMD Athlon MP model 6 1.002 1.008 1.016
Compensating for Diode Non-Ideality
In order to compensate for the errors introduced by non-ideality, the temperature sensor is calibrated for a
particular processor. Texas Instruments temperature sensors are always calibrated to the typical non-ideality of a
given processor type. The LM95221 is calibrated for a non-ideality of 1.008 and a series resistance of 2.7Ω.
When a temperature sensor calibrated for a particular processor type is used with a different processor type or a
given processor type has a non-ideality that strays from the typical, errors are introduced.
Temperature errors associated with non-ideality may be reduced in a specific temperature range of concern
through use of an offset calibration accomplished through software.
Please send an email to [e-mail] requesting further information on our recommended
offset value for different processor types.
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