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PC87591L Datasheet(PDF) 189 Page - National Semiconductor (TI) |
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PC87591L Datasheet(HTML) 189 Page - National Semiconductor (TI) |
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189 / 437 page  Embedded Controller Modules (Continued) Revision 1.07 189 www.national.com Twisted Pair and Shielded Cables For remote sensor distances longer than 8 inches or in particularly noisy environments, a twisted pair cable is recommended. Its practical 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 such as that used for audio microphones. Connect the twist- ed pair to DP and DN and the shield to AGND close to the PC87591x, and leave the remote end of the shield unterminated. For very long cable runs, the cable parasitic capacitance adds a delay to the Temperature Channel. You should add the cable capacitance to the value of the CD (see “Calculating the Temperature Channel Delay” on page 188) and correct the delay setting accordingly. Cable resistance also affects remote sensor accuracy. A 1 Ω series resistance introduces about +1.0˚C to +0.5˚C error. AGND 10 mil Minimum 10 mil 10 mil 10 mil DP DN AGND Figure 65. DP and DN, PCB Traces |
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