58.10 USB Interface

The USB interface consists of a differential data pair (D+/D-).

Refer to the Electrical Characteristics section for operating voltages which will allow USB operation.

Table 58-8. USB Interface Checklist
Signal Name Recommended Pin Connection Description
D+
  • The impedance of the pair must be matched on the PCB to minimize reflections.
  • USB differential tracks must be routed with the same characteristics (length, width, number of vias, and so on).
  • For a tightly coupled differential pair, the signal routing must be as parallel as possible with a minimum number of angles and vias.
 USB full-speed/low-speed positive data upstream pin.
D- USB full-speed/low-speed negative data upstream pin.

USB Host and Device Interface recommendations can be found in the Basic 32-Bit MCU Design and Troubleshooting Checklist guide on the Microchip web site.