What is the exact current drawn by CC2538 input pin with pull down configured. The datasheet says the value of pull-down is 20K which results in a current of around 165uA being drawn, while the DC characteristics section in datasheet mentions maximum current for logic '1' is 300nA . I am unable to measure the actual current being drawn by the input.
It is important to the current being drawn as the sensor with which i am using it can supply max upto 100uA, and above that the output of sensor varies randomly.