Tool/software:
Hi experts,
The configuration of my board is as follows.
I2C0_SCL pin in MCU------------------┐
+3.3v ---- 4.7k ohm pull-up resistor ---- led (in opto-coupler) --- 470 ohm resistor ---- ground
When the I2C0_SCL pin is set to active output, high, the output level is output at approximately 1.3v instead of 3.3v.
When I change to 10k ohm, I get 1.21v, and when I change to 3k ohm, I get 1.44v.
Do you know why it doesn't even come out in 3v?
Is the current limited causing a voltage drop?
Please answer.
Thank you.
best regards
