SP3232 Connections Check

[floxia]

Hi there!

I need help double-checking the following connections between the ATMega4809 and the SP3232. In the past, I have made mistakes such as inverting TX and RX at the UART side, and connected LEDs between the UART and ground, which prevented me from using hardware serial properly also the LED would always stay on and only turn off when the line was busy.

According to the datasheet, PC4 is TX and PC5 is RX. I will then select the correct serial port using the Port MUX in MegaCoreX.

I hope I have rectified these issues.

If someone could kindly confirm that this is the correct setup, it would be much appreciated.

This is my circuit:

SP3232 Diagram:

ATMega4809 Datasheet:

ATmega4808-4809-Data-Sheet-DS40002173A.pdf (152.8 KB)

[jim-p]

Is there a reason why you selected the alternate pins for UART1 and not the default?

[floxia]

I am using all the pins on the chip and 3 serials, for ease of PCB routing these pins where the most suitable.

[jim-p]

The SP3232 datasheet only specifies a output low voltage on the TTL outputs for a 1.6mA current.
I don't know what LEDs you are using but I'd make sure you are not drawing any more than 1mA or use a mosfet/driver to drive the LED
74LVC2G07

[floxia]

Thats a fair call I'll make sure not to draw more than that! Thank you for you feedback!