Hi Experts,
I have a question regarding the FR5969 Launch Pad. I was using it with a Sharp LCD Booster Pack and a customized analog front end circuit that should output a 1.65V offset signal. The output signal is coupled to one of the exposed pins (P3.0) which has been programmed to act as an ADC input (A12). My problem is that I get an extremely low input impedance (about 40 Ohms, measured between P3.0/A12 and GND) after I load and run my program on the Launch Pad. This makes it impossible to display the signal on the Sharp LCD. Now it can only display a voltage range of +/- 4mV despite it has been designed to show a voltage range of 0-3.3V. I was wondering if that was a software issue and if there is a way to reconfigure my code to change the input impedance. I was unable to find any related description in the datasheets and I would really appreciate it if someone could tell me how I can solve this issue. By the way, the ADC (A12) works perfectly well if connected to a function generator directly. Thank you all in advance for any help!
Best,
CFC
