Hi,
I'm working on a new project based on the PicoZed and PicoZed FMC Carrier Card V2. I'm going to design a custom Carrier Card.
I'm trying to understand the schematics and I have some doubts related to USB UART.
I don't understand, Why do they use a level shifter on the USB_UART_TXD and USB_UART_RXD with a p-mos BSS138?
I think it's a better option to eliminate the two bss-138 p-mos and connected them (USB_UART_TXD & USB_UART_RXD) directly, and feed the pin 5 (VIO) of the CP2104 IC to 1.8 Volts.
Does anyone know if I'm right?
Best regards.