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MAX9768 cannot MUTE

Category: Hardware
Product Number: MAX9768

hello

I have implemented MAX9768 for voice guidance on a microcontroller board PC that I designed.
When I connected a speaker and input voice data, it was able to speak.
The volume is controlled by I2C, and the MUTE pin is also connected to GPIO for control.

Even if this MUTE pin is set to high level, the volume is reduced, but it cannot be completely muted.
The same is true when the volume data is minimized via I2C.
Is there any possible cause for this?

Parents
  • Hello Ichiemo,

    Yes, ground and power and filter connections. We will need to see your schematics and the PCB layout details. Meanwhile, I will alert the specialist for this part about your post. Please provide this information. Any other information about your application may be helpful. 

    Dave T

  • PDFPDF

    Hello Dave.
    Thank you very much for your reply.
    Sorry for not explaining in detail.
    The power supply for max9768, PVDD = +5V and VDD = +3.3V, identical 0V.
    Attached is an excerpt of the schematic and PCB layout drawing.
    Before making this board, we modified the "max9768EvaluationKitBoard" and tested it with a microcontroller board.
    (The microcontroller is an NXP i.MX6ULL).
    Using the same data, we were able to mute the audio output on the prototype board.

Reply
  • PDFPDF

    Hello Dave.
    Thank you very much for your reply.
    Sorry for not explaining in detail.
    The power supply for max9768, PVDD = +5V and VDD = +3.3V, identical 0V.
    Attached is an excerpt of the schematic and PCB layout drawing.
    Before making this board, we modified the "max9768EvaluationKitBoard" and tested it with a microcontroller board.
    (The microcontroller is an NXP i.MX6ULL).
    Using the same data, we were able to mute the audio output on the prototype board.

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