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Published byLuis Hoover Modified over 2 years ago

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CAN Specifications Issues: –Width required for FPC CAN tracks –Number of twists per unit length in automotive CAN wires

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ISO 11898 CAN standard Table 13: Physical Media Parameters

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CAN Track Width ISO 11898 length related resistance: 70 m /m Easy to achieve with wire (0.26mm 2 ) Do we need to meet this standard on FPC? Implied track width 7.6 mm (for 1oz copper)

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CAN Track Width Consultation: –CAN group Warwick University –STA Reutlingen, Germany We do not need to meet 70 m /m 2mm or even 1 mm width tracks OK EMC test patterns mostly use 2mm

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Twists Per Unit Length NOT specified in ISO11898 standard STA Reutlingen counted 20 twists per metre (=1 twist per 2 ins) in a standard CAN cable product EMC test patterns max 277 wiggles per m min 20 wiggles per m (also zero wiggles per m)

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Twists Per Unit Length EMC performance strategy: compare EMC susceptibility of EMC test patterns with an automotive standard CAN cable product Need to obtain an automotive standard CAN cable product

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Track Width Justifications ISO11898 max CAN bus length 40m –Automotive length 5-10m –Therefore can increase resistance by factor 4-8 50 kBaud max bus length 1000m

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