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KenBoyce

 

Ken Boyce

Ken has 40 years of experience and his expertise spans the multimedia, communications and consumer electronics industries.  He has a personal interest in audio and multimedia related subjects.

 

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  • Hi do you have any information about any product based on BU9458 or BU9457. This is very interesting chips for MP3 decoding controlled by I2C from Romh. I need information if any succesfull product is based on this chip but I need independant opinion (not from Romh) about these chips. Best Regards Alex
  • in reply to Former Member

    Hello Alex,

     

    Unfortunately I do not have any product based experience with the BU9458 or BU9457 devices from Rohm.  Nor do I know of a commercial product on the market that uses them.

     

    Also, it appears that the datasheets for those devices do not offer much info on any application circuit.  So I can't really judge very well a potential product design based on them.

     

    However, the basic idea of the parts is good in that you have both SD card and USB (flash memory drive) as input sources for the formatted audio material.  Also, a key advantage is that the part can operate self contained as a decoder or can be controlled via an external processor/micro-controller.

     

    My direct experience with an MP3 player design was one involving a PIC microcontroller + an MP3 decoder which in turn was controlled by a larger CPU running a complex system that happened to need audio at various operations.  That design used a standard SD card with very simple file naming structure which may not meet your needs.  If you want more info on this, let me know.

     

    Ken

  • in reply to Former Member
    Thank you very much.
    I find solution thanks to Element14 PDF files on the server which are not has been available on any other place (even I could find that kind documentation on Rohm site) and later I got help from Anglia by providing to me Demo board and more info, but essentially this is the same information found on Element 14 for BU9458. There has been problem with information about "access code" as that part of information has not being 100% documented ( This is not so obvious until you try to finish product by using available information form PDF). After solving that problems chip is so easy to use and work perfectly. Really nice things are, that firmware inside the chip do all for you and find out about what kind a memory you are using (FAT32, 16, sectors, organizations etc). Even it is possible to read data from USB or SD not necessary MP3. Thanks to BU9458, Microcontroller can use large SD and USB not just to control music. It is possible to Read USB or SD and use this information to flash micro controller or just to use data for some other useful purpose to microcontroller as configurations files for example.
    Thank you very much again and best regards
    Alex
     
  • in reply to Former Member

    Hi Alex,

     

    Thank you for updating me on your project.  I am glad it has worked out well for you.  It would be great if Rohm improved their data sheet content.

     

    Kind regards,

    Ken

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