The CH375 is a USB bus interface chip that can operate in both USB‑HOST and USB‑DEVICE (SLAVE) modes. It provides an 8‑bit parallel data bus and a serial interface, allowing easy connection to microcontrollers, DSPs or other controllers. The chip supports full‑speed USB devices, mass‑storage protocols and dynamic switching between host and device modes.
The manual describes the pin definitions, command set, hardware connections, and provides programming examples for common operations such as reading/writing USB storage, setting baud rate, and entering low‑power sleep mode. This manual is written in Chinese.
| USB host speed | Full‑speed (12 Mbps) and Low‑speed (1.5 Mbps) |
|---|---|
| USB device compatibility | Fully compatible with CH372 chip |
| Supported voltages | 5 V and 3.3 V |
| Package | SOP‑28, RoHS compliant |
| Maximum storage capacity | Up to 2000 GB per USB storage device |
The ENTER_SLEEP command puts the chip into a low‑power suspend state.
Connect the 8‑bit data bus (D0‑D7), RD#, WR#, CS#, INT# and address line A0 to the microcontroller’s bus; RD# and WR# are active‑low control signals.