CH375 Chinese manual (I) is the user manual of CH375 USB bus interface chip, which mainly introduces the function characteristics, pin definition, package form and application circuit of CH375.
The CH375 is a universal USB bus interface chip that can operate in both USB‑HOST and USB‑DEVICE modes. It provides an 8‑bit parallel bus and a serial interface for connection to microcontrollers, DSPs or MCUs, and includes built‑in support for mass‑storage devices.
The manual describes the chip’s hardware pins, command set, interrupt status codes, and the provided software libraries for file‑level access, including support for FAT12/16/32 file systems and capacities up to 100 GB. This manual is written in Chinese.
| Operating voltage | 5 V (CH375A) or 3.3 V‑5 V (CH375B) |
|---|---|
| Package | SOP‑28, RoHS‑compliant |
| USB speed | 12 Mbps full‑speed, 1.5 Mbps low‑speed |
| Endpoint buffer size | 64 bytes per endpoint |
| Supported file systems | FAT12, FAT16, FAT32 |
| Maximum storage capacity | 100 GB+ |
| Baud‑rate adjustment | Dynamic via SET_BAUDRATE command |
| Mass‑storage protocol | Built‑in Bulk‑Only transport |
The CH375A version works with a 5 V supply, while the CH375B version operates from 3.3 V to 5 V.
Use the SET_BAUDRATE command with the appropriate divisor and constant values to set a new baud rate.
Issue the GET_1G_VER command; the chip returns a byte containing the version number.