The CH375B USB Module is a compact, versatile USB interface communication board designed for embedded systems requiring USB host or device functionality. Built around the CH375B chip from WCH (Nanjing Qinheng Microelectronics), this module enables microcontrollers such as 51 series, STM32, Arduino, and other MCUs to communicate with USB devices, read/write USB flash drives, and interface with USB peripherals. It is an ideal solution for data logging, firmware updates, USB device control, and embedded USB applications.
At the heart of the module is the CH375B, a USB bus interface chip that supports both USB Host and USB Device modes. In host mode, the CH375B can communicate with USB flash drives, keyboards, mice, printers, 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 CH375B chip includes a built-in firmware that handles the USB protocol, reducing the software burden on the host microcontroller. The module supports USB flash drive read/write through the CH375B’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 CH375B 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 CH375B 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 CH375B’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 CH375B 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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CH375B USB interface chip — Supports USB Host and USB Device modes
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USB 2.0 Full Speed — 12Mbps data rate, USB 1.1 compatible
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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 FAT file system support
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Onboard level shifting — 3.3V/5V compatible
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Built-in firmware — Handles USB protocol, reducing MCU software burden
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LED indicators — Power and USB activity status
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Screw terminals/pin headers — Secure connection to host MCU
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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
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | USB Interface Chip | CH375B (WCH) |
| 2 | USB Standard | USB 2.0 Full Speed (12Mbps), USB 1.1 compatible |
| 3 | Operating Modes | USB Host / USB Device |
| 4 | Host Interface | 8-bit parallel / serial (SPI-like) |
| 5 | Operating Voltage | 3.3V – 5V DC (onboard level shifting) |
| 6 | Crystal | 12MHz (onboard) |
| 7 | File System Support | FAT16/FAT32 (for USB flash drives) |
| 8 | Module Dimensions | Compact PCB with mounting holes |
