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AN2282 - Analog - Resonant Bridge Oscillators for Piezoelectric Buzzers | Cypress Semiconductor

AN2282 - Analog - Resonant Bridge Oscillators for Piezoelectric Buzzers

Last Updated: 
Aug 25, 2015

This Application Note shows an example of a piezoelectric resonator with an excitation throughout its frequency range using the PSoC® 1 device. This technique allows the user to obtain the maximum output power for a given supply voltage. The oscillators have no CPU overhead during operation.


Piezoelectric buzzers are widely used in various embedded systems including alarm systems, vending machines, kiosks, access control devices, entertainment systems, home appliances, and medical equipment. In most cases, only a 3.0- to 5.0-volt supply is available, which makes it more difficult to obtain a loud audio signal because piezoelectric materials usually require higher operating voltages. Combining a bridge buzzer together with resonant frequency excitation renders higher power supply voltage usage and increases the generated sound pressure level.


Example Project

Supported H/W and S/W Supported PSoC1 Devices
PSoC Designer Version H/W Kit CY8C20xxx CY8C21xxx CY8C22xxx CY8C23xxx CY8C24xxx CY8C27xxx CY8C28xxx CY8C29xxx
Yes 5.4 CY3210-PSoCEVAL1         x23A, 794 x43   x66