4.2 Necessary Modifications Specific to USB Type-C

Specific Modes Support

The modifications described in this section allow using the USB type-C as a self-powered board in the following configurations:

  • Downstream-facing port (DFP) mode: Host
  • Upstream-facing port (UFP) mode: Device

Modification 1: Discontinuation of Previous CC Management

To ensure proper functionality of the USB Type-C Configuration Channel (CC), certain modifications are required in the existing circuit design. These changes involve the removal of specific components that are no longer needed and the addition of new ones that are essential for the CC operation.

The following components must be carefully desoldered and removed from the circuit board: U203, C216, R112, R113, C215; U205, C219, R215, R217, C218, R216; U204, R214, and C217.

Figure 4-2. Old Configuration Channel Management System Components Schematic
Figure 4-3. Detail of the Old Configuration Channel Management System Components Layout

Modification 2: Update to the New CC Management

New components must be added to the circuit to facilitate the CC functionality. The details of these components, including their values, positions, and connections, can be found in the updated schematics provided.

Refer to the following figure for a detailed information on where to place the new components and how to route the connections. The schematic provides a visual guide to ensure that the modifications are carried out correctly.

Figure 4-4. Configuration Channel Management System Schematic
Note: For proper operation, a discharge of the VBUS must also be implemented.
Figure 4-5. VBUS Discharge Management System Schematic

The connections for these modifications on the current PCB can be made as follows:

  1. Connect PA12 to the pin 1 of the J403 connector.
  2. Connect PB0 to the pin 5 of the J403 connector.
  3. Connect PC18 to the pin 6 of the J402 connector.
  4. Connect PC27 to the pin 8 of the J402 connector.
  5. Connect 3.3V to the pin 4 of the J401 connector.
  6. Connect 5V to the pin 4 of the J401 connector.
  7. Connect GND to the pin 7 of the J401 connector.
  8. Connect VBUS to the diode D207 (previously replaced by a 0Ω resistor).
  9. Connect CC1 to the ferrite bead JFB201.
  10. Connect CC2 to the ferrite bead FB202.
Figure 4-6.  Connection Details

Mode Configuration

The device is self-powered with JP1 and JP2 connected between the pin1 and pin 2 of J1 and J2, default configuration for available projects.

Figure 4-7. Example of Self-Powered Configuration

Bus powered with JP1 and JP2 connected between the pin 2 and pin 3 of J1 and J2.

Figure 4-8. Example of Bus-Powered Configuration