OEM638 Technical Specifications
Appendix E
OEM6 Family Installation and Operation User Manual Rev 12
184
E.1.6
CAN Interfaces
The OEM638 provides two CAN ports through the expansion header. The transceivers are provided on the
OEM638. The following figure shows a typical CAN protection and EMI filtering arrangement.
The combination of ferrite beads and small value capacitors are not necessarily required but may provide
improved EMI performance. A low capacitance TVS device is shown on the schematic to provide ESD
protection.
Figure 93: Example - CAN Protection and Filtering Circuit
The 120
Ω
termination resistor (R231 and R236) should only be used when the CAN device is used at one
end of the CAN bus. Multiple terminations along the length of the CAN bus will degrade performance for all
CAN devices on that bus.
Table 42: Bill of Materials (critical components)
Designator
Manufacturer
Manufacturer Part Number
FB204, FB207,
FB215, FB218
TDK
MMZ1608S800A
D220, D225
NXP Semiconductor PESD1CAN,215