Summary of Rohm has single chip USB audio decoder
ROHM's BU94702AKV is a single-chip USB audio decoder IC enabling music playback from USB flash drives and SD cards. It integrates a USB 2.0 host, SD controller, multiple audio decoders (MP3, WMA, AAC), DAC, amplifier, and system controller. This all-in-one solution simplifies adding multimedia functionality to devices like car stereos or portable players by supporting direct speaker connections via built-in LDO and DAC circuits.
Parts used in the BU94702AKV Audio Decoder Project:
- USB 2.0 Full Speed host I/F
- SD card I/F
- I2C format I/F with protocol conversion
- MP3 encode and decode functions
- WMA decode function
- AAC decode function
- WAV format file playing function
- Sample Rate Converter
- System Controller
- FAT analysis function
- CD-ROM I/F and decoder
- ID3TAG, WMATAG, and AACTAG analysis
- External serial Flash ROM
- Built-in LDO circuit
- Built-in DAC circuit
Desription
ROHM’s USB Audio Decoder ICs integrate a USB 2.0 host, SD memory card controller, AAC decoder, WMA decoder, MP3 decoder, Audio DAC amp, and a system controller all on a single chip, allowing easy playback of music stored in USB flash memory using an audio player. They can be easily added to virtually any audio device (i.e. CD player, mini-component stereo, portable player, car stereo) for greater functionality.
Features
USB2.0 Full Speed host I/F function contained.
- ・ SD card I/F function contained.
- ・ I2C format I/F function contained.
- ・ Protocol conversion from I2C to USB HID or from USB HID to I2C. *1
- ・ MP3 encode function contained. *2,*3,*10
- ・ MP3 decode function contained. *4
- ・ WMA decode function contained. *5
- ・ AAC decode function contained. *6,*7
- ・ WAV format file playing function contained. *7
- ・ Sample Rate Converter contained. *8
- ・ System Controller contained.
- ・ FAT analysis function contained.
- ・ CD-ROM I/F function and CD-ROM decoder function contained.
- ・ Browsing function of File Names, Folder Names on music playing contained.
- ・ ID3TAG and WMATAG and AACTAG Analysis.
- ・ Fast forward/backward playing function contained.
- ・ Resume function contained.
- ・ File data Reading/Writing function contained.
- ・ Program download function from external serial Flash ROM contained.USB2.0 Full Speed host I/F function contained.
- ・ SD card I/F function contained.
- ・ I2C format I/F function contained.
- ・ Protocol conversion from I2C to USB HID or from USB HID to I2C. *1
- ・ MP3 encode function contained. *2,*3,*10
- ・ MP3 decode function contained. *4
- ・ WMA decode function contained. *5
- ・ AAC decode function contained. *6,*7
- ・ WAV format file playing function contained. *7
- ・ Sample Rate Converter contained. *8
- ・ System Controller contained.
- ・ FAT analysis function contained.
- ・ CD-ROM I/F function and CD-ROM decoder function contained.
- ・ Browsing function of File Names, Folder Names on music playing contained.
- ・ ID3TAG and WMATAG and AACTAG Analysis.
- ・ Fast forward/backward playing function contained.
- ・ Resume function contained.
- ・ File data Reading/Writing function contained.
- ・ Program download function from external serial Flash ROM contained.
Rohm has developed a USB audio decoder IC which will provide audio playback of MP3 files from CD-ROM and USB memory using just a single chip.
As USB and SD memory cards become the de facto storage medium for audio and multimedia files. Rohm has a range of single-chip USB audio decoders for different file formats.
The BU94702AKV has a USB/SD memory card host functionality, MP3/AAC/WMA decoder, FAT file system, and a music search function (file browser) that allows track selection during playback.
Also, built-in LDO and DAC circuits are designed to simplify configuration of an audio system by supporting direct connection to power supply audio amp, and speakers.
The device is availabel in a VQFP80 package.
For more read: Rohm has single chip USB audio decoder
- What storage media does the BU94702AKV support?
The device supports playback from USB flash memory and SD memory cards. - Can this chip decode MP3 files?
Yes, it contains both MP3 encode and decode functions. - Does the IC require external components for audio output?
No, it features built-in LDO and DAC circuits designed to simplify configuration by supporting direct connection to power supply, audio amp, and speakers. - What file formats can the BU94702AKV play?
It supports MP3, WMA, AAC, and WAV format files. - How does the device handle file navigation during playback?
It includes a music search function and browsing capability for file names and folder names. - Is there a feature to resume playback after interruption?
Yes, the device contains a resume function. - What interface is used for protocol conversion?
The chip contains an I2C format I/F function that allows protocol conversion from I2C to USB HID or from USB HID to I2C. - Can the program be downloaded from external memory?
Yes, it includes a program download function from external serial Flash ROM.
