/diy/ - Do It Yourself

>>2493425
Ok so I've thought of these three methods to get tristate PWM from 2 pins. Method A gives 0.5*Vcc as an output when A is high and B is low, which may not be accepted (idk just says voltage thresholds, not impedance thresholds). Method B will give high-Z when A is low and B is high, but I'd need to throw both A and B up and down, which may get annoying for bit-masking and such. Method C gives high-Z when A is high and B is low, I think. The switching speed of the FET won't be as fast as I might want, but I doubt it makes a difference as turning off all FETs during normal operation results in current going through half-bridge body diodes anyhow. Which is odd considering a non-PWM waveform usually has that modified-sine dead-zone in the middle.