Device Overview

The CH591D module-Bluetooth Low Energy (BLE) and USB-C connectivity, making it ideal for low-power wireless applications that also require USB communication .

Technical Specifications

Connection & Pins

Use Cases

• Wireless controllers or macro keypads( IMK8K )

• Portable BLE-enabled gadgets

• USB-HID device development

• IoT modules with BLE notifications

• Development and testing of BLE applications

Software Support

• IDE: MounRiver Studio (official from WCH)

• WCHISPTool

• Available libraries: BLE, USB HID, UART, SPI

• SDK from WCH (open source)

• Datasheet...
• WCH Tools,drivers

Programming Steps:

1. Preparation

• Download and install MounRiver Studio from: https://www.wch.cn

• Create a new project for CH591D:

  • File → New → Project → CH591

  • Select target chip: CH591D

2. Write Code

• Write your C code (e.g., LED blink).

• Make sure you have a main() function.

• Save your .c file in the src directory.

• Generating HEX File

  • Right-click your project in MounRiver → Build Project

  • The generated .hex file will be located at:
    ProjectFolder/output/ch591.hex

3. USB DFU Boot Setup

• CH591D can be programmed over USB if PB7 is pulled to GND during power-up.Steps:

• 1. Press and hold the button BOOT1 (PB7 = GND)

  2. Plug in the USB cable

  3. Release the button

• The device will show up as WCHISP (depends on OS)

4. Uploading to Chip

• In MounRiver go to: Tools → WCHISPTool
  Or use standalone WCHISPTool

• Load the HEX file and click Download

• The firmware will be flashed over USB

Prototype Notice

NOTICE: This CH591D module is a development prototype. It may contain limitations, experimental firmware, or test components. Intended for development, debugging, and testing only.