I'm digitally sampling a pin @80khz. The readings are coming back all zero and they should not. I am measuring the pin with a scope and it shows the square wave I am expecting with 3.3v max. If I short the input pin to the 3.3V pin on the Teensy, the readings come back as all '1's. I also drove it with a square wave generated by the teensy and it seemed to read the pin just fine. It only seems to be failing when its driven by my existing circuit, even when the voltage levels observed at the pin are 3.3v.
Can it be possible that my circuit is not supplying enough current or some such? Are there specs on this?
Can it be possible that my circuit is not supplying enough current or some such? Are there specs on this?