The CH376S USB Module is a compact, versatile USB interface communication board designed for embedded systems requiring USB host or device functionality with built-in file system support. Built around the CH376S chip from WCH (Nanjing Qinheng Microelectronics), this module enables microcontrollers such as 51 series, STM32, Arduino, and other MCUs to read and write files on USB flash drives, SD cards, and other storage devices. It is an ideal solution for data logging, firmware updates, file transfer, and embedded storage applications.
At the heart of the module is the CH376S, a USB bus interface chip with built-in FAT16/FAT32 file system firmware. Unlike the CH375B which requires the host MCU to manage the file system, the CH376S handles all file system operations internally — including file creation, reading, writing, and directory management. This significantly reduces the software burden on the host microcontroller, making it easier to implement USB storage applications.
The CH376S supports USB Host and USB Device modes, as well as SD card interfaces. In host mode, it can communicate with USB flash drives, keyboards, mice, and other USB peripherals. In device mode, it can act as a USB device when connected to a host computer. The chip supports USB 2.0 Full Speed (12Mbps) and is compatible with USB 1.1.
The module communicates with the host microcontroller through a parallel or serial interface, making it flexible for different MCU architectures. The 8-bit parallel interface provides high-speed data transfer, while the serial interface (SPI-like) offers simpler wiring for space-constrained designs. The module includes onboard level shifting and voltage regulation, allowing it to operate from 3.3V or 5V supplies.
The CH376S chip includes built-in firmware that handles USB protocol and file system operations, reducing the software burden on the host microcontroller. The module supports USB flash drive read/write through the CH376S’s built-in FAT file system support, making it easy to create data loggers, firmware update systems, and file transfer applications.
The module features screw terminals or pin headers for secure connection to the host MCU, and LED indicators for power and USB activity status. The compact PCB design with mounting holes allows easy integration into equipment enclosures, project boxes, and embedded systems.
The CH376S module is widely used in data logging systems, USB flash drive readers, firmware update tools, USB device controllers, embedded storage solutions, and 51/STM32/Arduino USB projects. It is also popular in educational projects for teaching USB communication and embedded systems.
Important Note: The CH376S operates from 3.3V or 5V depending on the module variant. Ensure the power supply and logic levels match your microcontroller. The module requires a 12MHz crystal for USB timing, which is included on the board. For USB host applications, ensure the USB device is compatible with the CH376S’s supported protocols.
Whether you are building a USB data logger, adding USB host capability to an embedded system, or creating a custom USB device, the CH376S USB Module provides a reliable, well-supported solution. It is suitable for individual makers, students, and businesses purchasing in bulk for product development or educational programs.
Features
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CH376S USB interface chip — Supports USB Host and USB Device modes
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Built-in FAT16/FAT32 file system — Handles file operations internally
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USB 2.0 Full Speed — 12Mbps data rate, USB 1.1 compatible
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SD card interface support — Additional storage option
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Parallel and serial interfaces — Flexible connection to 51, STM32, Arduino, and other MCUs
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USB flash drive read/write — Built-in file system support
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Onboard level shifting — 3.3V/5V compatible
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Built-in firmware — Handles USB protocol and file system, reducing MCU software burden
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LED indicators — Power and USB activity status
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Compact PCB design — With mounting holes for easy integration
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Wide application range — Data logging, firmware updates, USB device control, embedded storage
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | USB Interface Chip | CH376S (WCH) |
| 2 | USB Standard | USB 2.0 Full Speed (12Mbps), USB 1.1 compatible |
| 3 | Operating Modes | USB Host / USB Device / SD Card |
| 4 | Host Interface | 8-bit parallel / serial (SPI-like) |
| 5 | File System Support | FAT16/FAT32 (built-in) |
| 6 | Operating Voltage | 3.3V – 5V DC (onboard level shifting) |
| 7 | Crystal | 12MHz (onboard) |
| 8 | Module Dimensions | Compact PCB with mounting holes |
