Aideepen | CH340 Opto-Isolated USB to TTL Serial Module 4-Level 5V/3.3V/2.5V/1.8V High Compatibility Stable Programming for Industrial

Features:1. Integrated isolation technology with excellent CH340 compatibility.2. Easy to use, simple wiring, and capable of providing external power.3. Supports baud rates up to 153,600 bps, meeting the needs of most common applications.4. Integrated isolation chip ensures more stable programming and clear status indication.5. Wide range of applications, suitable for high-voltage, high-speed, and industrial environments.Product Description:All models in this product line are isolated serial ports, meaning the TX/RX signal lines and GND line are physically isolated.Without an isolated power supply: The device must provide power to the serial port side; connect to a 3.3V power supply for a 3.3V signal level, or to a 5V power supply for a 5V signal level. Features include: compact size, low cost, and the ability to freely control signal levels, allowing for special levels such as 3.6V or 4.2V (controlled by the input voltage).With Isolated Power Supply: Features an integrated isolated power conversion module; simply plug it into a computer’s USB port for power. No power supply is required on the serial port side, and signal levels are switched via on-board jumper caps. Features include: ease of use (communication requires connecting only three wires: GND, TX, and RX), and the ability to provide external power to loads not exceeding 200 mA.Medium speed: Supports baud rates up to 153,600 bps. Suitable for most general applications, with supported baud rates including: 50, 75, 100, 110, 134.5, 150, 300, 600, 900, 1200, 1800, 2400, 3600, 4800, 9600, 14400, 19200, 28800, 33600, 38400, 56000, 57600, 76800, 115200, 128000, 153600,High Speed: Supports baud rates up to 2 Mbps. In addition to the baud rates listed above, it also supports high-speed rates such as 230,400, 460,800, 921,600, 1,500,000, and 2,000,000, making it suitable for high-speed applications.Key Performance Parameters:● Uses the CH340 controller, providing drivers for Windows, Linux, and Mac 32-bit and 64-bit operating systems; native serial port programs require no modifications.● Features an original, integrated isolation chip that delivers clean waveforms, low power consumption, and stable communication.● Electrical isolation (including GND) with a 1500V withstand voltage, fully ensuring the safety of both the computer and users.● There is no electrical connection between the USB port and the serial port, fully protecting the computer from damage caused by external short circuits or surges, and preventing system crashes due to strong pulses or interference.● PCB slots ensure an isolation spacing of at least 3 mm, guaranteeing sufficient distance to prevent creepage.● The output power supply (VCC) and signal levels are truly switchable to accommodate systems with different voltages.● Models with an integrated isolated power supply support USB plug-and-play, require no separate power source, and can provide 100 mA of current output to external devices. (Models without an isolated power supply require an external power source.)● Signal lines incorporate protective diodes to enhance surge resistance.● Features three integrated LED indicators—blue for power, red for transmission, and green for reception—to facilitate monitoring of communication status.● The TX pin incorporates a reverse-connection protection diode and provides an open-drain TX-D output, facilitating microcontroller programming (without this diode, the TX pin would supply power to the microcontroller, causing incomplete power shutdown and resulting in download failure).● Utilizes high-quality plastic pin headers and a copper-core USB connector; 100% tested before shipment.● Stability has been significantly enhanced, truly achieving a combination of high speed, excellent stability, interference resistance, and high-quality waveforms.Pin FunctionsPins for Normal Communication Connection:● Level Selection Pin: Used to select the signal and VCC power supply levels; connect to either 5V or 3.3V.● TX: Serial data transmission pin (refers to the module’s own data output →, corresponding to the RX data reception pin on the external device).● RX: Serial data receive pin (indicates data input ← to the module itself; corresponds to the external device’s TX data transmission.)● GND: Power ground (Must be connected to GND; incorrect connection may damage the device or the serial port module.)The following pins are not used for communication; decide whether to connect them based on your needs:● VCC: Power output (Voltage is determined by the level selection jumper cap; load must not exceed 150mA; 100mA or less is recommended)●TX-D: TX signal routed through a reverse-biased diode, i.e., an open-drain TX signal. It can only output a low level and requires an external pull-up. When downloading programs to an STC microcontroller, use TX-D instead of TX and connect it to the MCU’s P30 pin.●5V: 5V power supply output (from USB; load must not exceed 150mA; 100mA or less is recommended).●3.3V: 3.3V power supply output (from LDO; load must not exceed 150mA; 100mA or less is recommended).Product List:1x Module1x 4-pin terminal cable (random colors)Notes:● This module supports switching both signal pins and power pins to 5V/3.3V simultaneously (using VCC for external power supply, with signal pins and VCC at the same level), or it supports using different levels for signals and power (using 5V or 3.3V pins for external power supply).● During factory testing, the default level is set to 3.3V. The TX/RX pins are connected directly; simply disconnect them before use.Notes:● Models with an integrated isolated power supply do not require an external power source. Models without an isolated power supply require an external power source.● This module operates at TTL levels (5V/3.3V) and is not compatible with RS-232 levels (+-5V to +-15V). Please verify the voltage levels of your device before use.