Can Bus Cable Capacitance

8 x outer diameter.

Can bus cable capacitance.

If v l line voltage v p phase voltage the charging current per phase. 42 volts on the can bus and can withstand transient energy spikes of or 250 volts without damage to the node. Mutual capacitance 800 hz max. The effect of cable capacitance depends on the design of the control current cir cuit.

0 3µf per km for two wire con trol and. The coil current can still flow due to the cable capacitance so that the contactor remains in the on position if sufficient sealing current is present. The capacitance of each conductor to neutral or equivalent capacitance is given by. The wires are a twisted pair with a 120 ω nominal characteristic impedance.

The variation in the shape of the conductor and the use of the filler makes it difficult to estimate the capacitance of the cable from its diameter. Additionally the differential signaling inherent in can helps to filter out noise. 30 c to 80 c. Unitronic bus can 1 x 2 x 0 22 5 7.

2 critical spacing of can bus connections slla279a november 2008 revised january 2009. In addition their capacitance must be considered. Can bus traffic the data link and physical signaling layers of figure 1 which are normally transparent to a system operator are included in any controller that implements the can protocol such as the texas instruments tms320f2812 3 3 v dsp with integrated can controller. However in some systems the environment is harsh enough that extra protection and or extra filtering is needed to protect the node and ensure clean.

Measurement of c c and c s. This bus uses differential wired and signals. Enough to clamp the transient voltages. Two signals can high canh and can low canl are either driven to a dominant state with canh canl or not driven and pulled by passive resistors to a recessive state with canh canl.

1 1 capacitance of control cables a guide value for control cable capaci tances between two conduc tors is approx. Peak operating voltage not for power applications 250 v. If the capacitance is too high it can work together with the choke s inductance and cause ringing on the bus signals. Connection to the physical medium the bus.

Capacitance ranges from about 35 pf m for low capacitance shielded twisted pair cable to 70 pf m for backplanes. Although this ringing does not corrupt the can signals it might show up as electromagnetic emission at higher frequencies.