USB PCB Design for Microcontroller

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Below is the detailed schematic wiring suggestion based on your design intent. You can use the "Apply changes" button to implement these schematic changes.
Schematic Wiring Suggestions
  1. ATmega32U4-MU (U1) & USB Type-C Connector (P2):
    • Connect the USB data pairs (D+ and D–) from the USB Type-C Connector to the corresponding USB pins on the ATmega32U4-MU.
    • Wire the 5V supply from the USB-C connector to the VCC pin on U1.
    • Ensure decoupling capacitors (e.g., C3 and C4) are connected to the VCC power pins of U1 with their other leads tied to Ground.
  2. USB Micro-B Connector (P1) Connections for Custom Data Interface:
    • Connect the D– line of P1 to a designated clock input pin on U1 (e.g., one of the available I/O pins configured in your Arduino sketch).
    • Connect the D+ line of P1 to an I/O pin on U1, reserved for synchronous data reception.
    • Connect the ground pin of P1 to the Ground to maintain a common reference.
  3. 1.5V Power Supply for the USB Micro-B Connector (P1):
    • Use an LDO Regulator for 1.5V (U2) to derive a 1.5V rail from the 5V provided at the USB-C connector.
    • Connect the 5V from P2 to the input of U2 and route U2’s 1.5V output to the VCC pin of P1.
    • Add the recommended decoupling capacitors at both the input and output of U2 as per its datasheet recommendations.
  4. Common Grounding:
    • Ensure all ground connections from U1, P1, P2, and U2 are connected together using the dedicated Ground component.
Signal Overview

Table

Signal/ConnectorConnection Details
USB Type-C Connector (P2) D+/D–Routed directly to U1’s integrated USB interface for programming and power.
USB Micro-B Connector (P1) D–Routed to a designated clock input on U1 for the peripheral’s clock signal.
USB Micro-B Connector (P1) D+Routed to a designated data input on U1 for synchronous data transmission.
USB Micro-B Connector (P1) VCCSupplied by 1.5V from U2 (LDO), ensuring the connected device receives the required voltage.
DecouplingProper bypass capacitors ([C3], [C4], etc.) placed on U1 and around U2.
All GroundsConnected through a common [Ground] component.
This configuration leverages the ATmega32U4-MU's built-in USB interface for programming and general operation via the USB-C connector while isolating the custom USB Micro-B data path (with its unique clock and synchronous data requirements) with dedicated power provided by the LDO regulator.
Would you like to see the net connections in a step-by-step sequence, or do you have any additional details to refine further?
Step-by-step net sequence
Clarify power net assignments
Focus on power and ground nets
Refine net connectivity for TXB0102
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U2
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