CH340 optical isolation serial port module USB to TTL serial port module 5V3.3V2.5V1.8V four levels

CH340 Completely isolated USB to TTL serial port (that is, UART, COM port)

The integrated isolation technology, the original CH340 is good, greatly improves the security and anti -interference performance of serial communication debugging, which is very suitable for high -voltage and strong pulse industry occasions.Convenient and easy to use.

Model description:

The selection of this link product is completely isolated serial port, that is, the TX/RX signal line and the GND line are true isolation.

Without isolation power supply: The serial port side requires the device to provide a power supply, the 3.3V power is required to connect the 3.3V power supply, and the 5V power supply is required to connect the 5V power.

The characteristics are: small volume, low price, free control of signal levels, and special levels such as 3.6V 4.2V (control signal level from the input voltage).

Bring isolation power supply: Integrated the isolated power conversion module, just insert the computer USB to power the power. The serial port side does not need to provide a power supply. Switch the signal level through the plate jump cap.

The characteristics are: easy to use (only three lines of GND/TX/RX), and can also provide power supply, and the maximum load does not exceed 200mA.

Middle speed: Maximum support from Potter to 153600bps.能满足大部分普通情况应用，支持波特率为：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: Maximum support to Potter rate to 2Mbps.In addition to the above Potter rate, it also supports high -speed high -speed, 460800, 921600, 1500,000, 2000000, etc., which are suitable for high -speed applications.

Blue, green, and purple 5V/3.3V products are the same. The maximum rate is 2Mbps, but the PCB color is different.The maximum rate of white models is 1153600bps.

Main feature

● Original CH340 main control, provides Windows/Lniux/Mac 32/64 -bit operating system drivers. The native serial port program does not require any modification.

● Original integrated isolation chip, with good waveforms, low power consumption, stable communication.

● Complete electrical isolation (including GND), 1500V resistance, fully guarantee computer and personal security.

● There is no electrical connection on the USB end and serial port. It fully guarantees that the computer will not cause damage due to external short circuit and impact, and will not cause crashes due to strong pulses and interference.

● PCB slot, isolation distances above 3mm to ensure enough distance to avoid climbing.

● The output power supply VCC and the signal level can be switched to the system with different voltage.

● Integrated the model of the isolation power supply, USB is plugged in, no need to power alone, and can provide a 100mA current output to the outside.(External power supply without isolation power)

● The signal line integrates protects the diode to improve its impact resistance.

● Integrated the power supply blue, send red, and receive the three LED indicators of green to facilitate the communication status.

● TX integrated anti-connecting diode, providing TX-D with leakage output, which is convenient to burn the single-chip microcomputer program (TX without reverse diode will power the single-chip microcomputer and download the power failure.

● Use high -quality plastic needle, copper core USB interface, 100%test after testing.

● Special enhanced stability, truly high speed, good stability, combination of anti -interference and high -quality waveforms.

Pin function

Normal communication must be connected.

● Select the level of the level: For selecting signals and power VCC foot levels, one of 5V or 3.3V must be connected.

● TX: Serial data sending pipe foot (referring to the data of the module itself →, corresponding to the RX. Data reception of external device.)

● RX: Serial data receiving tube foot (refers to the data input ← of the data of the module itself, corresponding to the TX. Data send.)

● GND: Powerland (GND must be connected and must not be mistaken, otherwise it may damage the device or serial port module)

The following tube feet are not necessary to communicate, decide whether to connect according to your own needs

● VCC: Power output (Voltage is determined by the level selection jump cap, the maximum load must not exceed 150mA, it is recommended to be less than 100mA)

● TX-D: After the reverse diode TX, that is, the TX signal of the leakage output can only output low levels and require external pulling.When the STC single-chip machine download program, use TX-D instead of TX and connect to the P30 foot of the MCU.

● 5V: 5V power output (from USB, the maximum load must not exceed 150mA, it is recommended to be less than 100mA).

● 3.3V: 3.3V power output (from LDO, the maximum load must not exceed 150mA, it is recommended to be less than 100mA).

hint

● This module can support the signal pipe foot and the power supply foot switch to 5V/3.3V at the same time (using VCC to power the external power, the signal foot and VCC level are the same), it can also support the signal and power supply to use different levels (use 5V or 3.3 3.3 3.3V pipe foot supply power).

● When the factory test, choose 3.3V by default.TX/RX is directly connected and removed during use.

Precautions

● Integrated the isolated power supply without external power.The model without isolation power requires an external power supply.

● This module is TTL level (5V/3.3V), and the RS-232 level (+-5V to+-15V) cannot be connected. Please confirm the level of your device before use.