The voltage of the RXD and TXD depends on the VCC pin, right?
Morning guys; I bought an HW-624 to connect to the console of my SBC and ESP. However, the "documentation" is anything but clear ... it's actually quite confusing.
Here are my questions:
-The voltage of the RXD and TXD depends on the VCC pin, right? If I put 3.3v on it, they will be at 3.3v and not 5v from the USB port, correct?
-The RXD of the board goes to the RXD of the controller and the TXD to the TXD, right? Because the documentation on Aliexpress seems to say otherwise.
Thank you.
Solution:Jump to solution
sometimes the voltage of the RXD and TXD is not dependent on the VCC power supply, you ought to confirm from the manufacturers datasheet. Sometimes VCC might be 3.3V and the RXD/TXD pins will be 1.8V i have seen this before. So always confirm this from the device documentation before you start work, least you blow up stuffs.
3 Replies
I think the VCC pin is connected to USB 5V, so it will output 5V. This looks like CH340 chip, this board is missing the 3.3V regulator, The three square pad are solder jumpers, if you want to make the board 3.3V, cut the small trace between the first and second and short second and the third pad. Doing this USB will not power this board, you will have to connect 3.3V to VCC pin externally.
Measure the voltages on the outputs first before connecting anything to it.
Usually the RX for to TX and TX goes to RX. If it doesn't work, flip the wires.
Solution
sometimes the voltage of the RXD and TXD is not dependent on the VCC power supply, you ought to confirm from the manufacturers datasheet. Sometimes VCC might be 3.3V and the RXD/TXD pins will be 1.8V i have seen this before. So always confirm this from the device documentation before you start work, least you blow up stuffs.