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Chapter 3 New for OEM7 – Hardware
Table 68: CAN Transceiver Example Bill of Materials (critical components)
Designator
FB1, FB2
U1
U2
3.5.5 USB Interface
OEM7 receivers include one USB 2.0 device interface capable of either Full-Speed (12Mb/s) or
High-Speed (480Mb/s) transfer rates. On the OEM719 and OEM729 receivers, the default trans-
fer rate for the USB Device port is Full-Speed (12Mb/s). The USB device interface on the
OEM7700 receiver is set for a default of High-Speed (480Mb/s). The device interface will not
auto-negotiate the speed with the Host computer. However, the speed of the device interface
can be changed using the USBCONFIG command and SAVEUSBCONFIG command.
It is imperative for signal integrity and EMI reasons that the differential data traces be routed as
a 90Ω differential pair. Use of a small-value common-mode choke (as shown in Figure 7: OEM7
USB Device Interface Example below) may improve the radiated emissions performance (but
should not be necessary).
Any stubs on the traces must be kept as short as possible and it is strongly recommended not to
change reference planes. Match the USB differential pair (D+ and D- trace lengths) to within
3mm or less.
The common-mode choke and ESD protection should be placed as close as possible to the USB
connector (J1).
OEM6 to OEM7 Integration Guide v1
Manufacturer
TDK
Texas Instruments
Bourns
Figure 7: OEM7 USB Device Interface Example
Manufacturer Part Number
MMZ1005B800C
SN65HVD231QD
CDNBS08-PLC03-6
168
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