Icom Ci V Usb Interface Schematic Top May 2026

(Computer Interface V) system is a bi-directional, single-wire serial bus used to control Icom amateur radio transceivers. While modern rigs like the Icom IC-7300

For those who prefer discrete builds, a simple two-transistor circuit can shift RS-232 levels (if using a serial-to-USB cable) or module levels to the CI-V bus. icom ci v usb interface schematic top

Future Developments and Upgrades

Key Components (Top Level)

1. USB connector (Type B or Mini)
2. USB-to-UART IC – FT232RL (preferred, has 5V/3.3V output), CP2102, CH340
3. Level translator / buffer – Single transistor (2N7000 or BS170) for open-collector CI-V bus
4. Pull-up resistor – 4.7kΩ to 10kΩ on CI-V data line to 5V
5. 3.5mm mono (or stereo) jack – Tip = CI-V data, Sleeve = GND
6. Optional protection – 5.1V Zener diode, 100Ω series resistor on CI-V line
7. Optional LEDs – TX/RX activity (connected to TXD/RXD via transistors or inverters)

Drivers: If building your own, ensure you install the appropriate Virtual COM Port (VCP) drivers from the chip manufacturer (e.g., FTDI) to allow software like Ham Radio Deluxe or FLDigi to communicate with the rig. Explore USB with this USB to CI-V Interface - N5DUX USB connector (Type B or Mini) USB-to-UART IC

1. CI-V Signal Transmission: The ICOM radio transmits a CI-V signal to the ICOM CI-V USB interface.
2. Signal Conditioning: The CI-V interface circuitry conditions the CI-V signal for transmission to the microcontroller.
3. Microcontroller Processing: The microcontroller receives the conditioned CI-V signal and converts it to a digital signal.
4. USB Transmission: The digital signal is transmitted over USB to the computer using a USB-to-serial converter.
5. Computer Processing: The computer receives the digital signal and processes it using software applications like Ham Radio Deluxe or ICOM's own software.

Pull-up Resistor: A resistor (often around 4.7kΩ to 10kΩ) pulls the DATA line high when idle. Isolation & Protection: Drivers : If building your own, ensure you

: Some designs include ferrite beads on the data and power lines to block stray RF noise. 2. Bill of Materials (BOM) You can find these parts at retailers like Specification FTDI FT232RL or CP2102 USB-to-UART Bridge Combines TX/RX for single-wire CI-V Pull-up resistor for the data line Capacitors 0.1 µF & 100 pF Noise bypassing and filtering 3.5mm Mono Plug Standard CI-V "Remote" jack connection Shielded Audio Cable Prevents RF interference 3. Construction Steps Prepare the USB Module

Before diving into the USB interface schematic, it's essential to understand the ICOM CI-V protocol. CI-V is a communication protocol developed by ICOM, a Japanese company renowned for its high-quality amateur radio equipment. The CI-V protocol allows ICOM radios to communicate with external devices, such as computers, using a serial interface. This protocol enables features like remote control, frequency setting, and data transmission.