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Soldered USB-Cereal

Soldered USB-Cereal is a powerful and fully open-source development tool that simplifies testing, development, debugging, and manufacturing of devices that support USB Type-C. This device saves time and effort by enabling the capture of debug and factory logs, providing a simple command-line interface, and facilitating firmware updates. The USB-Cereal enables simple UART serial communication with the host device through the sideband pins. This device can perform general closed-case debugging, testing, and data capture on devices with USB Type-C and doesn’t require a USB stack to be brought up. The USB-Cereal can also perform low-level debugging with USB drivers not yet fully loaded and closed-case firmware update procedures. This device can capture development logs with the Device Under Test (DUT) closed up, without any jumper wires hanging around, and without any extra connectors. The USB-Cereal supports up to 3Mbps rate for both 1.8 V and 3.3 V signal levels. This device features onboard green and orange LEDs to indicate both TX and RX operations. The USB-Cereal mechanically supports USB-C plug.

Features

  • Development logs can be captured with the Device Under Test (DUT) closed up, without any jumper wires hanging around, and no extra connectors
  • No USB drivers on the DUT need to be brought up or booted to get communication running back and forth
  • Another USB Type-C accessory supported by the DUT can be connected via the pass-through port
  • No extra DUT costs are incurred, as no extra components or mechanical considerations are needed
  • No extra components on the DUT board means maximum space savings for denser designs
  • Up to 3-Mbps rates are supported for both 1.8 V and 3.3 V signal levels
  • No auto-level detection
  • No orientation detection is implemented
  • Both TX and RX operations are indicated using onboard green and orange LEDs
  • Major OS distributions support the FT232RNQ
  • Extremely portable
  • USB-C plug is mechanically supported by the PCB and by the enclosure

Block Diagram

Block Diagram - Soldered USB-Cereal
Publicerad: 2025-07-14 | Uppdaterad: 2025-07-23