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LM95234 Datasheet(PDF) 34 Page - Texas Instruments |
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LM95234 Datasheet(HTML) 34 Page - Texas Instruments |
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34 / 44 page  q kT = t V F I = I x K t V BE V © § ¹ · S x e « « ¬ ª » » ¼ º -1 LM95234 SNIS136D – AUGUST 2006 – REVISED MARCH 2013 www.ti.com Bit(s) Bit Name Read/ Description Write 7 0 RO Read only bit will always report "0". 6 0 RO Read only bit will always report "0". 5 0 RO Read only bit will always report "0". 4 16 R/W bit weight 16°C 3 8 R/W bit weight 8°C 2 4 R/W bit weight 4°C 1 2 R/W bit weight 2°C 0 1 R/W bit weight 1°C IDENTIFICATION REGISTERS Register Name Command Read/ D7 D6 D5 D4 D3 D2 D1 D0 POR Byte Write Default (Hex) (Hex) Manufacturer ID 0xFE RO 0 0 0 0 0 0 0 1 0x01 Revision ID 0xFF RO 0 1 1 1 1 0 0 1 0x79 Applications Hints The LM95234 can be applied easily in the same way as other integrated-circuit temperature sensors, and its remote diode sensing capability allows it to be used in new ways as well. It can be soldered to a printed circuit board, and because the path of best thermal conductivity is between the die and the pins, its temperature will effectively be that of the printed circuit board lands and traces soldered to the LM95234's pins. This presumes that the ambient air temperature is almost the same as the surface temperature of the printed circuit board; if the air temperature is much higher or lower than the surface temperature, the actual temperature of the LM95234 die will be at an intermediate temperature between the surface and air temperatures. Again, the primary thermal conduction path is through the leads, so the circuit board temperature will contribute to the die temperature much more strongly than will the air temperature. To measure temperature external to the LM95234's die, incorporates remote diode sensing technology. This diode can be located on the die of a target IC, allowing measurement of the IC's temperature, independent of the LM95234's temperature. A discrete diode can also be used to sense the temperature of external objects or ambient air. Remember that a discrete diode's temperature will be affected, and often dominated, by the temperature of its leads. Most silicon diodes do not lend themselves well to this application. It is recommended that an MMBT3904 transistor base emitter junction be used with the collector tied to the base. The LM95234’s TruTherm BJT beta compensation technology allows accurate sensing of integrated thermal diodes, such as those found on most processors. With TruTherm technology turned off, the LM95234 can measure a diode-connected transistor such as the MMBT3904 or the thermal diode found in an AMD processor. The LM95234 has been optimized to measure the remote thermal diode integrated in a typical Intel processor on 65 nm or 90 nm process or an MMBT3904 transistor. Using the Remote Diode Model Select register any of the four remote inputs can be optimized for a typical Intel processor on 65 nm or 90 nm process or an MMBT3904. DIODE NON-IDEALITY Diode Non-Ideality Factor Effect on Accuracy When a transistor is connected as a diode, the following relationship holds for variables VBE, T and IF: where • • q = 1.6×10 −19 Coulombs (the electron charge), 34 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: LM95234 |
Similar Part No. - LM95234_15 |
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Similar Description - LM95234_15 |
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