- Mon Apr 02, 2018 8:56 am
#198808
Hello,
Usually I find my way in looking solved topics but not this time.
My problem is that I connected a tsunami board(3.3V) to a MEGA2560 ECU(5V).
I use the UART connection of both and used an logic level converter for Tx and Rx lignes. Of course Rx / Tx of ECU and Tsunami are swap together.
When the ECU (MEGA2560) send a message, all happens fine. I checked with a digital oscilloscope, the tsunami answer right as descibe in the spec. But when the message go back to the ECU throught the logic level converter something strange happens. It's like if LOW level haven't enough power to stay at GND. On the top of my picture you can show falling edge but LOW level don't stay. FYI, on the bottom of the pic, it's that I mesure before the logic level converter just at the output of the Tsunmai Board.
As you can imagine, I will appreciate any idea.
Usually I find my way in looking solved topics but not this time.
My problem is that I connected a tsunami board(3.3V) to a MEGA2560 ECU(5V).
I use the UART connection of both and used an logic level converter for Tx and Rx lignes. Of course Rx / Tx of ECU and Tsunami are swap together.
When the ECU (MEGA2560) send a message, all happens fine. I checked with a digital oscilloscope, the tsunami answer right as descibe in the spec. But when the message go back to the ECU throught the logic level converter something strange happens. It's like if LOW level haven't enough power to stay at GND. On the top of my picture you can show falling edge but LOW level don't stay. FYI, on the bottom of the pic, it's that I mesure before the logic level converter just at the output of the Tsunmai Board.
As you can imagine, I will appreciate any idea.
