I am designing a circuit with a piezo buzzer. I want to use one that I can attach directly to my uC output pin (no transistor).
The question is, can I do it with this one? (PS1240P02AT) http://www.farnell.com/datasheets/84905.pdf
It says 4khz rectangular wave and 3V. But what about current consuption? Can I just add a series resistance around 200 ohm in order to limit the output current to a safe value?
Actually I am a little bit confused. I thought piezo buzzers do not need a PWM wave, only a "high" logic level and they sound, whereas piezo transducers do need the square signal. However, this one says piezo buzzer (without circuit) so I assume it is a piezo transducer. Is it right?