CJMCU FT232H USB to JTAG/UART/FIFO/SPI/I2C Module User’s Guide

Overview

The FT232H module is a versatile USB bridge that supports multiple protocols—UART, SPI, I2C, JTAG, and FIFO—via a single USB interface. It’s ideal for high-speed communication, debugging, and programming of embedded systems.

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Key Specifications

Feature	Details
USB Interface	USB 2.0 High-Speed (480 Mbps)
Protocols Supported	UART, SPI, I2C, JTAG, FIFO
Voltage Levels	3.3V logic (5V tolerant inputs)
Chipset	FTDI FT232H
GPIOs	Up to 8 configurable pins
OS Compatibility	Windows, macOS, Linux

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Driver Installation

Windows

1. Download FTDI VCP drivers.
2. Install and reboot.
3. Confirm COM port in Device Manager.

macOS & Linux

• Use built-in FTDI support or install D2XX drivers.
• For Python use, install libftdi or pyftdi.

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Pinout Reference

Pin Label	Function	Notes
AC0-AC9 / D0–D7	GPIO / SPI / UART / I2C / JTAG	Configurable via software
+5V	5V from USB	Power output
+3.3V	3.3V from LDO	Power output
VCORE	1.8V from LDO	Power output
GND	Ground	Common ground

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Protocol Usage Guide

UART Mode

• Use Case: Serial console, bootloader flashing
• Tools: PuTTY, TeraTerm, Arduino IDE
• Wiring:
  • D0 → TX
  • D1 → RX
  • GND → GND
• Baud Rate: Up to 12 Mbps

SPI Mode

• Use Case: Flash memory access, sensor interfacing
• Tools: pyftdi.spi, libftdi, OpenOCD
• Wiring:
  • D0 → MOSI
  • D1 → MISO
  • D2 → SCLK
  • D3 → CS
  • GND → GND

I2C Mode

• Use Case: EEPROM, RTC, sensor communication
• Tools: pyftdi.i2c, libftdi
• Wiring:
  • D0 → SDA
  • D1 → SCL
  • GND → GND
• Pull-ups: External 4.7kΩ recommended

JTAG Mode

• Use Case: Debugging ARM/FPGA
• Tools: OpenOCD
• Wiring:
  • TCK, TDI, TDO, TMS → Target JTAG pins
  • GND → GND

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Python Setup (PyFtdi)

pip install pyftdi

Example: I2C Scan

from pyftdi.i2c import I2cController
i2c = I2cController()
i2c.configure('ftdi://ftdi:232h/1')
print(i2c.scan())

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Troubleshooting

Issue	Solution
Device not detected	Check cable, reinstall driver
Protocol not working	Confirm pin mapping and voltage levels
Python errors	Use correct URI and install pyftdi
JTAG fails	Verify target voltage and pinout

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Pro Tips

• Use external level shifters for 1.8V targets.
• Combine with logic analyzers for protocol debugging.
• Use OpenOCD for JTAG workflows with STM32 or FPGAs.
• For SPI flash programming, try flashrom or pyftdi.spi.

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