Update: 30 September, 2023
The LM95221 is a digital temperature sensor produced by Texas Instruments. It uses the SMBus 2.0 interface and can detect three temperature zones, including its own temperature and the temperature of two diode connected transistors. The diode connected transistors can be a thermal diode as found in Pentium and AMD processors, or simply be a diode connected MMBT3904 transistor. The LM95221 remote temperature reading resolution format can be programmed to be 10-bits plus sign or 11-bits unsigned. In the unsigned mode, the LM95221 remote diode readings can resolve temperatures above 127 degrees Celsius. Local temperature readings have a resolution of 9-bits plus sign. Any ASIC can be accurately determined using the LM95221 as long as a dedicated diode (semiconductor junction) is available on the target die. The LM95221 remote sensor accuracy of ±1 degrees Celsius is factory trimmed for a series resistance of 2.7 ohms and a 1.008 non-ideality factor.
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Publication date: 04 June, 2012
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