Proper routing and placement is important to maintain the signal integrity the SBU and CC line signals. The following guidelines apply to the TPD4S201:
- Place the bypass capacitors as close as possible
to the VPWR pin, and ESD protection capacitor as close as
possible to the VBIAS pin. Attach capacitors to a solid ground to
minimize voltage disturbances during transient events such as
short-to-VBUS and ESD strikes.
- Route the SBU lines as straight as possible and
minimize any sharp bends.
Standard ESD recommendations apply to the C_CC1, C_CC2, C_SBU1, C_SBU2:
- The optimum placement for the device is as close to the connector as possible:
- EMI during an ESD event couples from the trace
being struck to other nearby unprotected traces, resulting in early
system failures.
- The PCB designer minimizes the possibility of EMI
coupling by keeping any unprotected traces away from the protected
traces which are between the TPD4S201 and the
connector.
- Route the protected traces as straight as possible.
- Eliminate any sharp corners on the protected traces between the TVS and the connector by using rounded corners with the largest radii possible.
- Electric fields tend to build up on corners, increasing EMI coupling.