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LM95231 Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LM95231 Datasheet(HTML) 8 Page - National Semiconductor (TI) |
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8 / 20 page  Typical Performance Characteristics Thermal Diode Capacitor or PCB Leakage Current Effect Remote Diode Temperature Reading Remote Temperature Reading Sensitivity to Thermal Diode Filter Capacitance 20120205 20120207 Conversion Rate Effect on Average Power Supply Current 20120247 1.0 Functional Description The LM95231 is a digital sensor that can sense the tempera- ture of 3 thermal zones using a sigma-delta analog-to-digital converter. It can measure its local die temperature and the temperature of two external transistor junctions using a ∆V be temperature sensing method. The LM95231 can support two external transistor types, a Pentium 4 processor on 90nm process thermal diode or a 2N3904 diode connected tran- sistor. The transistor type is register programmable and does not require software intervention after initialization. The LM95231 has an advanced input stage using National Semi- conductor’s TruTherm technology that reduces the spread in non-ideality found in Pentium 4 processors on 90nm pro- cess. Internal analog filtering has been included in the ther- mal diode input stage thus minimizing the need for external thermal diode filter capacitors. In addition a digital filter has been added. These noise immunity improvements in the analog input stage along with the digital filtering will allow longer trace tracks or cabling to the thermal diode than previous thermal diode sensor devices. The 2-wire serial interface, of the LM95231, is compatible with SMBus 2.0 and I2C®. Please see the SMBus 2.0 speci- fication for a detailed description of the differences between the I2C bus and SMBus. The temperature conversion rate is programmable to allow the user to optimize the current consumption of the LM95231 to the system requirements. The LM95231 can be placed in shutdown to minimize power consumption when tempera- ture data is not required. While in shutdown, a 1-shot con- version mode allows system control of the conversion rate for ultimate flexibility. The remote diode temperature resolution is variable and depends on whether the digital filter is activated. When the digital filter is active the resolution is thirteen bits and is programmable to 13-bits unsigned or 12-bits plus sign, with a least-significant-bit (LSb) weight for both resolutions of 0.03125˚C. When the digital filter is inactive the resolution is eleven bits and is programmable to 11-bits unsigned or 10-bits plus sign, with a least-significant-bit (LSb) weight for both resolutions of 0.125˚C. The unsigned resolution allows www.national.com 8 |
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