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Using a Piezo Driver for a Doorbell Chime

Akash Patel
Expert 6245 points
Other Parts Discussed in Thread: DRV2700, LM48560

Hi team,

We are interesting in being able to play a user selected sound inside the house when someone rings a doorbell. Would a Piezo Driver, such as the DRV2700, be good for such an application?

Regards,

Akash Patel

  • 0
    TI__Genius 10512 points
    Hi Akash,

    The DRV2700 could be suitable for this type of application using a piezo sounder. Look at the TIDU994a reference design for a similar application. The LM48560 could also be applicable.
  • 0 in reply to Kelly Griffin
    TI__Expert 6245 points
    Hi Kelly,

    Thanks for the quick response. That was the reference design that I was looking at.

    In the reference design document, it says "Piezo transducers generally have lower power consumption than dynamic speakers, particularly for narrow-bandwidth alarm signals that require a high sound pressure level (SPL) to meet regulatory requirements."

    We necessarily don't need such a high SPL as would be found in a smoke detector or fire alarm. Would a piezo driver be able to handle various doorbell sounds at varying frequencies? From my understanding piezo drivers are limited in their frequency operation making suitable for products operating at narrow frequencies such as smoke detectors and fire alarms.

    Regards,
    Akash Patel
  • 0 in reply to Akash Patel
    TI__Genius 10512 points
    Hi Akash,

    Yes, we can play different tones/sounds at varying frequencies. You are correct about the limited frequency. This limit will be determined by the necessary boost voltage and the capacitance of the piezo transducer. As these parameters increase, the bandwidth will decrease. The DRV2700 datasheet has quite a few graphs to help you find the bandwidth at different boost voltages.