Good morning,
I'm using the SN65HVD233 part in a new design. I do not want diagnostic loopback mode to be enabled. Per the data sheet pin #5 can be left open and is pulled low internally.
This is the exact configuration in my design. However, when transmitting data into pin #1 (D signal) I see the data looped back to pin #4 (R signal). I have confirmed pin #5 is open.
Debugging, I've pulled the LBK signal directly to gnd and diagnostic loopback remains enabled.
Further, the data sheet indicates if LBK is enabled, the output driver is disabled. However, I'm seeing a signal on both the CANH and CANL pins.
The Vcc rail (3.3V) looks clean.
Any insight would be appreciated.
Best Regards.