I've been using 5V I2C into OPUS which is a 3.3V device. So far it has worked, but I am going to find out from Wolfson if the device is 5V tolerant. However, I think it is safer to use the pull-up resistors referenced to 3.3V instead of the 5V. The 3.3V reference in Arduino can supply 50 mA. I'm going to check if this is sufficient.
Update: I've attempted to make the change to 3.3V (by changing the position of the pull-up resistors) and although everything works as before it is not yet the right solution because Arduino enables the pull up resistors internally. See post on final solution.
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment