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Recommendation for audio feedback. | Cypress Semiconductor

Recommendation for audio feedback.

Summary: 6 Replies, Latest post by danaaknight on 18 Mar 2015 09:57 AM PDT
Verified Answers: 1
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nIk
nIk's picture
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5 posts

Hello,

I have tried to find dedicated forum for newely launch MBR series but could not find it. Hence I am posting this question here in this form. Accept my apology for this. We have got newely launched CY8CMBR3110 chip and we have developed custom boards using this chip. Its working like a charm. Now we want to provide audio feedback for touch. As CY8CMBR3110 has dedicated buzzer pin we are planning to use that pin only. I think to use piezo buzzer will not be the best solution as sound produce by piezo buzzzer could be annoying. So I am looking for various options which can generate very good audio feedback. What is best way to achieve this? Is there any other ICs available which can be used?

Thanks,

Niral

user_1377889's picture
User
9581 posts

I would suggest you to have a look at the documentation of the CY3280-MBR3 Evaluation Kit, schematics and BoM. The kit has got a buzzer connected and in the BoM you will see the kind of device attached.

 

Bob

 

user_14586677's picture
User
7646 posts

One solution might be to use WaveDac, freq can be changed, and feed that to a small

electromagnetic speaker. That would require an external amp, there are many parts in

the 25 cent range that can do that. TI, ONN, ROHM......

 

The WaveDac can supply sine which gets rid of the annoying harmonic problem, and

by muxing clock to wavedac or using APIs you could do tone sequences.

 

Regards, Dana.

 

 

 

user_1377889's picture
User
9581 posts

Sorry, no WaveDac in an MBR3

 

Bob

user_14586677's picture
User
7646 posts

Having looked at the wrong part (me) the best way to make

a buzzer sound non raspy is twofold -

 

1) Pick it for a natural resonance in the range you want. That maximizes

loudness.

2) RC filter it to suppress harmonics, the principal cause of crappy

sound.

3) Plastic enclosure also helps in shaping the overall sound quality

properties.

 

Drive it differentially to maximize loudness. When you do place

diode clamps to each rail on the GPIO pin to eliminate transients

on the GPIO pins outside their allowed range.

 

Regards, Dana

nIk
nIk's picture
User
5 posts

Thank you for the responses. @Dana, I will give it a try.

Niral

user_14586677's picture
User
7646 posts

You are always welcome!

 

Dana.

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