©
Technosoft 2007
38
PIM2401 Technical Reference
3.2.12.2 Recommendation for wiring
a) Build CAN network using cables with 2-pairs of twisted wires (2 wires/pair) as follows:
one pair for CAN_H with CAN_L and the other pair for CAN_V+ with CAN_GND. The
cable impedance must be 105 ... 135 ohms (120 ohms typical) and a capacitance below
30pF/meter.
b) When using a printed circuit board (PCB) motherboard based on FR-4 material, build the
CAN network using a pair of 12mil (0.012”) tracks, spaced 8 to 10mils (0.008”…0.010”)
apart, placed over a local ground plane (microstrip) which extends at least 1mm left and
right to the tracks.
c) Whenever possible, use daisy-chain links between the CAN nodes. Avoid using stubs. A
stub is a "T" connection, where a derivation is taken from the main bus. When stubs can’t
be avoided keep them as short as possible. For 1 Mbit/s (worst case), the maximum stub
length must be below 0.3 meters.
d) The
120
Ω
termination resistors must be rated at 0.2W minimum. Do not use winded
resistors, which are inductive.
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