LM95231

www.DataSheet4U.com LM95231 TruTherm Precision Dual Remote Diode Temperature Sensor with SMBus Interface ADVANCE INFORMATION February 2005 LM95231 TruTherm™ Precision Dual Remote Diode Temperature Sensor with SMBus Interface General Description The LM95231 is a precision dual remote diode temperature sensor (RDTS) that uses National’s TruTherm technology. The 2-wire serial interface of the LM95231 is compatible with SMBus 2.0. The LM95231 can sense three temperature zones, it can measure the temperature of its own die as well as two diode connected transistors. The LM95231 includes digital filtering and an advanced input stage that includes analog filtering and TruTherm technology that reduces nonideality processor to processor spread. The diode connected transistors can be a “thermal diode” as found in Intel and AMD processors or can simply be a diode connected MMBT3904 transistor. TruTherm technology allows accurate measurement of “thermal diodes” found on small geometry processes, 90nm and below. The LM95231 supports user selectable thermal diode non-ideality of either a Pentium ® 4 processor in the 90nm process or 2N3904. The LM95231 resolution format for remote temperature readings can be programmed to be 11-bits signed or unKey Specifications signed with the digital filtering disabled. When the filtering is j Remote Diode Temperature Accuracy enabled the resolution increases to 13-bits signed or unsigned. In the unsigned mode the LM95231 remote diode TA=30˚C to 50˚C,...