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PC87366 데이터시트(PDF) 209 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 PC87366
상세설명  128-Pin LPC SuperI/O with System Hardware Monitoring, MIDI and Game Ports
PDF  240 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87366 데이터시트(HTML) 209 Page - National Semiconductor (TI)

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12.0 Temperature Sensor (TMS) (Continued)
209
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12.5.4
Twisted Pair and Shielded Cables
For remote sensor distances longer than 8 in., or in particularly noisy environments, a twisted pair is recommended. Its prac-
tical length is 6 feet to 12 feet (typical) before noise becomes a problem, as tested in a noisy electronics laboratory. For
longer distances, the best solution is a shielded twisted pair like that used for audio microphones. Connect the twisted pair
to DXP and DXN and the shield to GND, and leave the shield’s remote end unterminated.
Excess capacitance at DX_ limits practical remote sensor distances. For very long cable runs, the cable’s parasitic capaci-
tance often provides noise filtering, so the 2200 pF capacitor can often be removed or reduced in value.
Cable resistance also affects remote sensor accuracy; 1
Ω series resistance introduces about +1/2˚C error.



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