KAmod USB-UART-mini

Description

KAmod USB-UART-mini is a USB-C interface converter to the UART serial interface with small dimensions - only 20.5x10.5 mm. The module is based on the FT230XS system and has only basic signal lines - RX and TX, which operate at a voltage of 3.3 V. Additionally, the module contains communication indicators in the form of miniature LEDs. Optionally, the converter can be equipped with a front panel, which allows easy and aesthetic mounting of the module on the wall of almost any housing.

Basic parameters

The converter is based on the FTDI FT230XS chip
Compatible with USB 2.0 Full Speed
Drivers for Windows/Linux/Mac systems
On the USB interface side it contains a USB-C connector
Contains only the basic UART interface signal lines - RX and TX
5 V power supply supplied to the USB connector
The voltage level for serial interface signals is 3.3 V (tolerates 5 V voltage at the input)
Optionally, the voltage level for serial interface signals can be set to 5 V
Communication speed (bit rate): 300 bps...3 Mbps
LEDs indicating communication
Small board dimensions 20.5x10.5 mm, height approx. 7 mm
Optionally, it can be equipped with a front panel, which allows easy and aesthetic installation of the module on the wall of almost any housing

Standard equipment

Code	Description
KAmod USB-UART-mini	Assembled and started module Front panel (to be soldered) Straight goldpin male connector (to be soldered) Angled goldpin male connector (to be soldered)

Electrical diagram

USB interface connector

Connector	Function
USB-C	It implements communication in the USB 2.0 Full Speed standard It provides 5 V power

The USB-C connector is small, but convenient to use and resistant to damage. Additionally, it allows for the conduction of significant currents and can be used in the latest generation of interfaces - USB 3.x. These features make USB-C replace the old standards of USB connectors in many applications, which is why KAmod USB-UART-mini has been equipped with a USB-C connector.

Serial interface connector

Connector	Function
RX, TX, 5V, GND	RX and TX signals of the serial UART interface are derived 5 V power supply connected to the USB connector

The serial interface connector is adapted to mount goldpin pins with a pitch of 2.54 mm, but it also allows for soldering wires directly to the converter board. The signals derived on the connector are as follows:

TX – data output from the serial UART interface;
RX – data input to the UART interface;
5V – power output with a value of approx. 5 V supplied to the USB connector;
GND – power/signal ground.

Voltage level on UART interface lines

The RX and TX lines of the UART interface operate at a voltage of 3.3 V. Additionally, the RX input tolerates higher voltages, up to a maximum of 5 V.

Optionally, the module can be configured so that the RX and TX lines of the UART interface operate at a voltage of 5 V. Permanently shorting the pads located on the bottom of the board, marked "Vio=5V", with a drop of hot solder, will cause the interface to operate at a voltage of 5 V.

Signaling

Type	Function
LEDs	Signaling of data transmission and reception

There are 2 miniature LEDs on the converter board, which signal the flow of data between the interfaces.

Dimensions

The KAmod USB-UART-mini converter has small dimensions, the board measures 20.5x10.5 mm, and its heightis approx. 7 mm.

Mounting in the housing

The KAmod USB-UART-mini converter can optionally be equipped with a front panel, which allows easy and aesthetic mounting of the module on the wall of almost any housing. The dimensions of the front panel are shown in the drawing below.

Mounting the converter requires making a main hole with a diameter of 11 mm and two holes in one line, for mounting screws with a diameter of approx. 2...3 mm at a distance of 8.75 mm from the center of the main hole. An example of the assembly is shown in the photos: