In some remote control IC, like PT2262, 2272, there are 3 states:
VCC, GND, high resistance at address pin, what is the circuit
used in the IC internal ?
% Add a "weak driver" to this input pin.
If it is floating, then the weak drive will dominate its state.
PS. you need to drive both high and low. (2 cycles)
I didn't understand last circuit. If input is in high impedance state the base current of bipolar transistor will discharge input down to 0V. Why B should be 1?
I didn't understand last circuit. If input is in high impedance state the base current of bipolar transistor will discharge input down to 0V. Why B should be 1?