Datasheet

3.6 Direct Connections from the USB DIG Platform
www.ti.com Serial-Bus-EVM Hardware Setup
In some cases, it may be more useful to connect signals directly from the USB DIG Platform to some
custom hardware. This method typically uses a cable that connects to the D-SUB connector. It is
recommended that you use shielded coaxial cable to directly connect I
2
C and SPI signals to the custom
hardware. This direct connection eliminates capacitive coupling between the cables. Figure 9 shows a
cable design that does not use shielded coaxial cable and the problems typically associated with it.
Figure 10 shows a cable design using shielded coaxial cable. Figure 11 shows a photograph of a shielded
cable on a solder cup D-sub connector.
Figure 9. Unshielded Cable and Associated Problems
SBOU076 – September 2008 Serial-Bus Evaluation Module 11
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