On Orin Nano Datasheet Section 4.3 Digital Logic, the Pin DC characteristic is given.
For open drain output low voltage, the following parameters are given.
I have couple questions about this.
- Is the VDD in the table the pull-up voltage (3.3V) or the power rail on the pin mux? (vddio_ao = 1.8V for I2C0 and I2C1)
- Is the IOL governed by the pull-up resistance and pull up voltage? For example, for I2C1 the rail is 3.3V and pull-up resistance is 2.2kR , and thus the current is ~1.5mA?
- For I2C0, the note here says the pull-up resistance is 2.2kR. However in other documents (pinmux, design guide) the resistance is marked as 1.5kR. In this case will IOH be 3.3V / 1500R = 2.2mA and how will this affect max VOL?
- What is the max IOL the pin can tolerate?