PL2303GC ドライバーとUSBからシリアル

pl2303gc

This chip you’re using supports USB 2.0 full-speed communication and also works with older USB 1.1 devices. It’s super easy to use since the USB transceiver is built right in, meaning no external crystal is needed.

It also handles RS-232 UART communication. You can configure data bits, stop bits, and parity easily, and the baud rate ranges widely from 75bps to 12Mbps, covering practically every use case you might have.

Operating voltage is flexible—between 3.3V and 5V—and its low-power design is perfect for portable devices. You get extra GPIO pins, giving you more control over external equipment.

Packaging options like SSOP-28 or QFN keep your PCB layouts compact. Plus, drivers for Windows, Linux, and Mac OS are widely available, making compatibility a breeze. It even includes built-in ESD protection for improved durability and reliability.

pl2303gc pinout and wiring

When working with the PL2303GC, make sure the VIN pin connects directly to the USB’s 5V line. Set the I/O voltage (VDD_IO) between 1.8V and 5V depending on your device. The internal 3.3V regulator (VO_33) can power small external circuits, but don’t overload it.

For USB wiring, connect DP and DM lines through 27Ω resistors and add a 0.1µF capacitor close to the chip to clean up signals. For UART communication, connect TXD and RXD to the opposite RXD and TXD on the device. Match logic levels carefully. Other control signals like RTS or CTS can connect as needed.

GPIO pins (GPAx, GPBx) offer various features like LED indicators or I2C—use the OTPROM tool or EEPROM for configuring. Unused GPIO pins work best when set as inputs with pull-up or pull-down resistors.

The chip includes a built-in 96MHz clock, so usually there’s no need for an external crystal. Package options are SSOP-28 and UQFN-24, choose according to your PCB layout.

pl2303gc equivalent usb uart converter

When choosing alternatives to PL2303GC, it’s important to check package compatibility. For example, CP2102N uses a QFN-28 package, while CH340G comes in SSOP-16, so make sure your PCB layout matches.

Driver support varies. FT232RL and CP2102N have reliable drivers that install easily across most operating systems. CH340G might require manual driver setup and can sometimes cause compatibility headaches.

If high-speed communication or multiple GPIO pins matter for your project, PL2303GC or CP2102N will work better. If budget is tight and communication speeds aren’t critical, CH340G is affordable and effective.

Also, keep an eye on availability. FT232RL often experiences supply shortages or price fluctuations, making long-term planning tricky. Consider supply stability before deciding.

pl2303gc serial communication circuit

This circuit shows how to set up a USB-to-RS232 interface using a PL2303GC chip. It mainly has three sections: the USB connector, the PL2303GC chip itself, and an RS232 transceiver.

The USB connector supplies 5V power and connects data lines (D+ and D-) directly to the PL2303GC. The chip takes this USB data and converts it into TTL-level serial signals like TXD, RXD, and flow-control lines such as RTS and CTS. The TX_LED and RX_LED pins connect to LEDs to show you when data is sent or received. There’s also a built-in 3.3V regulator (VO_33) that powers the internal logic or small external circuits.

Next, an RS232 transceiver chip converts the PL2303GC’s TTL signals into standard RS232 signals, making it easy to hook up standard RS232 devices.

When connected to a PC via USB, the chip receives power and communicates over USB, converting data between USB and RS232, allowing seamless communication between computers and serial devices.

pl2303gc arduino connection guide

If you’re working with Arduino boards like the Pro Mini or Nano that don’t have built-in USB ports, using a PL2303GC USB-to-serial converter can save a lot of hassle. Just connect TX on the PL2303GC to RX (pin 0) on Arduino, RX to TX (pin 1), and make sure both share a common ground (GND). Match the Arduino’s voltage (3.3V or 5V) with the PL2303GC’s VO_33 or VDD_IO pin.

In the Arduino IDE, set your board type under “Tools → Board,” choose the correct COM port under “Tools → Port,” and pick a common baud rate like 9600 in your sketch (Serial.begin(9600);). Upload a simple program to test communication—sending “Hello from Arduino!” repeatedly works well.

Make sure the PL2303 drivers are installed on your computer for smooth connection. It’s perfect for programming Arduinos without built-in USB, debugging your projects, or collecting data easily.

pl2303gc usb ttl interface project

Here’s how the PL2303GC chip works: First, the computer sends data through its USB port (VBUS, D+, D-, GND) to the chip. Inside the chip, the USB signals are converted into simple UART signals at TTL voltage levels. Then, these TTL signals (TX and RX pins) directly connect to your device, like an Arduino or other microcontrollers, letting them communicate easily.

This setup makes it simple to debug or upload code to devices without USB ports. It also gives reliable, fast communication (up to 12Mbps), perfect for real-time data monitoring or embedded system debugging.

Common uses include Arduino, ESP32, or STM32 development boards, serial device maintenance, data acquisition setups, or general-purpose USB-to-serial adapters.

Just keep an eye on voltage levels—make sure your TTL logic is 3.3V or 5V to avoid damage. Adding decoupling capacitors and ESD protection devices also helps keep things running stable and safe.