USB-to-TTL serial port: The CH340 can realize bidrectional conversion between USB and TTL serial port, so that the host device with the USB interface can pass the USB communication line490 Serial chip is abnormal '>HR3490 Serial chip is abnormal
Does the subject want to ask "The reason why the HR3490 serial port chip is not working"? The interface is faulty. Procedure The HR3490 serial port chip uses the extension interface of the serial communication protocol. The failure is due to the interface fault, so the HR3490 serial port chip cannot be used normally. You can contact professionals for maintenance.
boot1 pin should be grounded, boot0 pull high, the serial port does not matter, the corresponding good. Baud rate 115200.
In addition to the suppression element on the data lineFor this problem, the specific steps for welding the chip of the screen display are as follows: Unscrew the fixing screw of the back cover of the LCD TV. Lift the back of the LCD TV up.
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can achieve a single piece of independent work without external components, but welding is the least easy; (3) FT8UThe 232BM is the most expensive, but the performance is the most stable, and the drive support is the best, and the welding is relatively easy. Of course, the specific need for which USB to serial chip, or please readers to choose according to their own situation.
Therefore, it is better to choose the popular two bus methods, such as powerbus bus, mbus bus, generally voltage, current return, the communication mechanism is different, determines the anti-interference ability is too strong, and even can be with 220 mains or even 380 power power common slot. Several chip models are recommended, powerbus pb620.
2, where com is the abbreviation of power amplifier, also known as Composite Output Module. COM design can improve the efficiency and output power of the power amplifier, is an important part of the power amplifier. COM can automatically adjust the voltage according to the output current of the power amplifier, so that the power amplifier is not affected by overload while maintaining high efficiency.
3, the serial chip is responsible for the control