I’m trying to drive an external DAC via I2C with a level shifter. I use the 5V pin as power (it’s just a DAC so current draw is minimal) and 1.8V pin as reference from the expansion headers. However, when I connect them both to my level shifter the screen changes to a yellowish hue and the file system suddenly becomes read-only. I can see the device with i2cdetect and write to it sometimes but the OS usually needs a reboot just a few seconds after connecting these 2 pins to my board. Disconnecting one of the two causes the screen to return to normal but the file system remains read only.
I’m on a Beagleboard xM rev C running Xubuntu.
Does anyone know what could be causing this?