I'm trying to learn my way around PICs. All I want to do is pulse an LED using only a 3V source. I'm using a 16F684A and the spec says it has an operating range of 2.0 - 5.5V. It also states that the "Voltage on all other pins with respect to VSS is -0.3V to VDD + 0.3V."
I can get the LED to turn on only when Vdd is 4.20V or higher.
I'm running an internal 4MHz clock
and theres only the PIC and the LED on the board.
The LED has a VF of roughly 1.7V.
In theory if I apply 3V for Vdd then there should exist 3V at the output pin of where the LED is placed, more that enough to bias it.
What am I doing wrong?
I can get the LED to turn on only when Vdd is 4.20V or higher.
I'm running an internal 4MHz clock
and theres only the PIC and the LED on the board.
The LED has a VF of roughly 1.7V.
In theory if I apply 3V for Vdd then there should exist 3V at the output pin of where the LED is placed, more that enough to bias it.
What am I doing wrong?