## Overview of the FT230XQ-R The **FT230XQ-R** is a compact, cost-effective USB-to-UART bridge IC developed by **FTDI Chip**. It belongs to the "X-Chip" series, designed to simplify the integration of USB functionality into embedded systems by handling the entire USB protocol on-chip. ### Key Specifications | Parameter | Specification | | :--- | :--- | | **Interface** | USB 2.0 Full Speed (12Mbps) to UART | | **Package** | 16-pin QFN (3mm x 3mm) | | **Operating Voltage** | 3.3V to 5.25V | | **I/O Voltage** | 1.8V to 3.3V (Logic levels) | | **UART Speed** | 300 baud to 3 Mbaud | | **Internal Memory** | 2048 Byte MTP (Multi-Time Programmable) | | **Current Consumption** | ~8mA (Active) / < 125µA (Suspend) | --- ### Core Electronic Components & Features The FT230XQ-R integrates several critical components into a single silicon die, reducing the need for external parts: 1. **Integrated Clock Circuit:** Unlike older USB chips, it does not require an external crystal or resonator. The clock is generated internally, saving PCB space. 2. **Internal LDO Regulator:** It features a built-in 3.3V Low Dropout (LDO) regulator, allowing the chip to be powered directly from the 5V USB bus while providing regulated power to internal logic. 3. **MTP Memory:** Contains an internal memory block used to store the USB VID, PID, serial number, and product description strings. This can be programmed via USB without an external EEPROM. 4. **Battery Charger Detection:** Includes a specialized circuit to detect the presence of a USB charging port (DCP or CDP), allowing the system to draw higher currents for battery charging. 5. **Configurable CBUS Pins:** Four Multi-Function I/O pins (CBUS) can be configured for various tasks, such as: * Driving LED indicators (TX/RX Activity). * Providing a clock output (6, 12, or 24 MHz). * USB Sleep/Suspend status. --- ### Pin Configuration Summary | Pin Group | Description | | :--- | :--- | | **USB Signals** | `USBDP` (D+) and `USBDM` (D-) differential pair for data. | | **UART Signals** | `TXD`, `RXD`, `RTS#`, `CTS#` for data and flow control. | | **Power** | `VCC` (Input), `VCCIO` (I/O Level), `3V3OUT` (Regulator output). | | **Control** | `RESET#` for hardware reset and `CBUS` pins for GPIO. | --- ### Typical Application Circuit Example When designing with the FT230XQ-R, minimal external components are required: * **Capacitors:** 100nF and 4.7µF decoupling capacitors on the VCC and 3V3OUT pins. * **Resistors:** 27Ω resistors on the USB D+/D- lines (though many X-series chips have these integrated, check the specific hardware manual version). ```mermaid graph LR USB_Port --- FT230XQ FT230XQ --- Microcontroller_UART FT230XQ --- Status_LEDs ```