The 7Semi USB to UART Isolated Converter Module combines the trusted FTDI FT234X USB-to-UART IC with the Texas Instruments ISO6721D digital isolator to deliver safe, robust, and isolated serial communication between your PC and embedded systems.
With USB Type-C connectivity, support for baud rates up to 3 Mbps, and galvanic isolation rated up to 3000 V RMS, this module is perfect for working with industrial electronics, noisy environments, and sensitive circuits.
It is plug-and-play on major operating systems thanks to FTDI’s VCP and D2XX drivers and is ideal for developers, hobbyists, and engineers who need both performance and protection.
Technical Specifications
USB Interface
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Controller: FTDI FT234X
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USB Standard: USB 2.0 Full Speed (12 Mbps)
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Connector: USB Type-C
UART Side
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Signal levels: 3.3V / 5V compatible (VCC selectable)
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Baud rate: 183 baud to 3 Mbps
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Pins: VCC, RX, TX, GND
Isolation
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IC: TI ISO6721D (dual-channel, reinforced isolation)
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Isolation rating: 3000 V RMS (UL 1577 certified)
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Withstands surges and prevents ground loops
General
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Supply Voltage: 3.3–5V (via USB)
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Drivers: FTDI VCP & D2XX (free download)
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Operating Temp: –40 °C to +85 °C (FT234X), –40 °C to +125 °C (ISO6721D)
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Board size: ~26.08mm × 11.01 mm compact module
Applications
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Microcontroller programming/debugging (Arduino, STM32, ESP32, PIC, etc.)
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Industrial system communication with ground isolation
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USB-to-UART in noisy environments
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RS232/RS485/RS422 front-end development with isolation
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Data logging and sensor interfacing
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Protecting PC/host from high-voltage transients
Package Includes
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1 × 7Semi USB to UART Isolated Converter Module (FT234X + ISO6721D, USB-C
FAQ
Q1. What microcontrollers can I use with this board?
Any MCU with I²C support (Arduino, ESP32, STM32, Raspberry Pi).
Q2. What is the default I²C address?
The module responds at 0x39.
Q3. Can I measure near-infrared (NIR) light?
Yes, selected channels cover up to 1000 nm.
Q4. Is there a built-in light source?
Yes, the board has a user LED for reflectance measurements.
Q5. Does it require 5 V tolerance?
No — the board is 3.3 V only, use a level shifter for 5 V systems.
Resources
- USB-UART and Isolation IC:
- FTDI FT234X and TI ISO6721D
- solation Rating:
- 3000 V RMS (UL 1577)
- USB Interface:
- USB 2.0 Full-Speed (12 Mbps)
- Connector Type:
- USB Type-C
- Baud Rate Range:
- 183 baud – 3 Mbps
- Signal Voltage:
- 3.3V / 5V compatible
- Operating Temperature:
- –40 °C to +85 °C (FT234X), –40 °C to +125 °C (ISO6721D)
