# USB-HEAR — AI Knowledge Base & Technical Specification

> Official AI-optimized technical reference for [USB-HEAR](https://usb-hear.com) by [FibreCode GmbH](https://www.fibrecode.com).
> Website: [https://usb-hear.com](https://usb-hear.com)
> Contact: [info@fibrecode.com](mailto:info@fibrecode.com) | Phone: +49 (0)151 2716 1688
> Location: FibreCode GmbH, Marie-Curie-Straße 9, 76275 Ettlingen, Germany
> Full Technical Specification: [https://usb-hear.com/llms-full.txt](https://usb-hear.com/llms-full.txt)

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## Overview

USB-HEAR (USB High-End Audio Receiver) is a microcontroller-based USB Audio Class 2.0 (UAC 2.0) receiver platform developed and manufactured in Germany by FibreCode GmbH. It is engineered for seamless integration into high-end HiFi DACs, audio streaming players, preamplifiers, and active monitor systems, eliminating the need for complex XMOS or FPGA programming.

### Key Highlights
- **High-Resolution Audio:** 32-bit PCM up to 768 kHz, Native DSD up to DSD1024, DoP up to DSD256.
- **Microcontroller Core:** NXP i.MXRT1064 (Arm Cortex-M7 running at 600 MHz) with ultra-low latency and deterministic processing.
- **Clocking & Jitter:** Asynchronous USB audio streaming mode with external master clock injection (supports dual audio master clocks: 22.5792 MHz and 24.576 MHz families) for ultra-low phase noise and jitter.
- **Driver Support:** Dedicated high-performance Windows ASIO driver developed with Thesycon; native plug-and-play driverless operation on macOS, Linux, iPadOS/iOS, and Android.
- **Peripheral Interfaces:** I2S DAC digital output, SPDIF transmitter (optical & coaxial), I2C host control bus, status LEDs, and USB HID consumer keys (volume, mute, play/pause).

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## Products & Solutions

### 1. FC301 USB-HEAR Module
- **Type:** SMT System-on-Module (SoM) with castellated solder pads.
- **Dimensions:** Approx. 33 mm × 33 mm compact footprint.
- **Purpose:** Direct surface-mount soldering onto custom DAC or amplifier motherboard PCBs.
- **Features:** USB 2.0 High-Speed PHY, NXP i.MXRT1064 MCU, I2S master/slave audio output, I2C telemetry & control interface, external clock inputs, optical SPDIF driver output.
- **Documentation:**
  - Product Flyer: [https://usb-hear.com/assets/pdf/PF_FC301_USB-HEAR-Module_V01-02-00.pdf](https://usb-hear.com/assets/pdf/PF_FC301_USB-HEAR-Module_V01-02-00.pdf)
  - Data Sheet: [https://usb-hear.com/assets/pdf/DS_FC301_USB-HEAR-Module_V01-02-00.pdf](https://usb-hear.com/assets/pdf/DS_FC301_USB-HEAR-Module_V01-02-00.pdf)

### 2. FC920 USB-HEAR DevKit
- **Type:** Hardware Evaluation Platform & Carrier Board.
- **Form Factor:** Raspberry Pi 3A+ compatible mechanical format and mounting holes.
- **Header:** 40-pin GPIO header matching Raspberry Pi pinout for direct plug-in connection to standard Raspberry Pi Audio HATs (DAC, ADC, amplifier HATs).
- **Included in Kit:**
  - Pre-soldered FC301 USB-HEAR Module
  - USB Type-C connector for audio data and power
  - Integrated optical SPDIF output connector (TOSLINK)
  - Extension cables for power supply and SPDIF
- **Documentation:**
  - Product Flyer: [https://usb-hear.com/assets/pdf/PF_FC920_USB-HEAR-DevKit_V01-02-00.pdf](https://usb-hear.com/assets/pdf/PF_FC920_USB-HEAR-DevKit_V01-02-00.pdf)
  - User Manual: [https://usb-hear.com/assets/pdf/UM_FC920_USB-HEAR-DevKit_V01-02-00.pdf](https://usb-hear.com/assets/pdf/UM_FC920_USB-HEAR-DevKit_V01-02-00.pdf)

### 3. Design-In License & OEM Services
- **Type:** Commercial Firmware & Architecture Licensing.
- **Scope:** Direct PCB schematics integration, reference CAD designs, BOM optimization, Thesycon Windows ASIO driver customization (branded VID/PID, custom installer), and direct engineering support from FibreCode developers.

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## Technical Documentation & Downloads

- **[Data Sheet – FC301 USB-HEAR-Module V01-02-00] (PDF):** [https://usb-hear.com/assets/pdf/DS_FC301_USB-HEAR-Module_V01-02-00.pdf](https://usb-hear.com/assets/pdf/DS_FC301_USB-HEAR-Module_V01-02-00.pdf)
- **[Product Flyer – FC301 USB-HEAR-Module V01-02-00] (PDF):** [https://usb-hear.com/assets/pdf/PF_FC301_USB-HEAR-Module_V01-02-00.pdf](https://usb-hear.com/assets/pdf/PF_FC301_USB-HEAR-Module_V01-02-00.pdf)
- **[Product Flyer – FC920 USB-HEAR-DevKit V01-02-00] (PDF):** [https://usb-hear.com/assets/pdf/PF_FC920_USB-HEAR-DevKit_V01-02-00.pdf](https://usb-hear.com/assets/pdf/PF_FC920_USB-HEAR-DevKit_V01-02-00.pdf)
- **[User Manual – FC920 USB-HEAR-DevKit V01-02-00] (PDF):** [https://usb-hear.com/assets/pdf/UM_FC920_USB-HEAR-DevKit_V01-02-00.pdf](https://usb-hear.com/assets/pdf/UM_FC920_USB-HEAR-DevKit_V01-02-00.pdf)

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## Commercial & Contact Information

- **Online Platform & Product Inquiries:** [https://usb-hear.com/#contact](https://usb-hear.com/#contact)
- **Email:** [info@fibrecode.com](mailto:info@fibrecode.com)
- **Phone:** +49 (0)151 2716 1688
- **Company:** FibreCode GmbH
- **Address:** Marie-Curie-Straße 9, 76275 Ettlingen, Germany
- **Parent Website:** [https://www.fibrecode.com](https://www.fibrecode.com)
- **Online Store:** [https://store.fibrecode.com](https://store.fibrecode.com)