e2e,
I'm trying to find the input and output impedance of the GPIOs of the MSP430G2153. I want to create a model for my SPI signal but need to know how to calculate the source and load resistance from the datasheet.
From the datasheet below it looks like the source impedance can be calculated by the 0.3 V drop with 6mA of current which would be about 50 ohms.
From the load impedance the max leakage would be 3V / 50nA with load resistance molded as 60M ohms.
What would be a situation I would use the internal pull down resistor to have the load impedance at 20k ohms?
Thank you,
Adam