Press Release
ROHM’s Audio System LSIs: BU9432-C1 and BU9434-C2
06.15.06
ROHM’s BU9432-C1 and BU9434-C2 audio system LSIs integrate a USB 2.0 full-speed host controller, a 3-channel power supply, an MP3 decoder, a DAC, and a system controller into a single chip, allowing playback of MP3 files contained on flash memory via USB. In addition, the BU9432-C1 features a headphone amplifier while the BU9434-C2 incorporates an SD card interface controller, a sound effecter, and I2S/SPDIF interface support.
The BU9432-C1 and BU9434-C2 are offered in the TQFP64V and VQFP64 package types, respectively.
Availability
BU9432-C1 is currently in mass production while samples of BU9434-C2 will be available at the end of September with mass production to begin in December.
Applications
Audio equipment
BU9432-C1 and BU9434-C2 Features:
System Controller Integrate and control USB, SD, MP3 systems
KEY or Serial Command Input—automatically searches for MP3 files in the USB/SD memory for playback
USB Host Interface Controller USB 1.1 and USB 2.0 full speed host
Mass storage class
USB HUB supported (BU9434-C2)
USB 1.1 / 2.0 Flash Memory / HDD
Memory size: 32M-2TByte
SD Card Interface Controller (BU9434-C2) MMC / Mini-SD supported
SPI mode supported
CPRM not supported
FAT File System FAT16 and FAT32 supported
Unlimited number of folders possible (but depth limit is 8)
Number of files: 65,534
Compatible file extensions: .MP3, .MP2*, MP1*
Hidden file playback capability
Multi-partition support (BU9434-C2)
*It is possible to select this file format
MP3 Decoder MPEG Audio 1, 2, 2.5
Layer 1, 2, 3
Sampling rate: 8K-48kHz
Bit rate: 8kbps-448kbps, VBR
Sample Rate Converter All sample rates converted to 44.1kHz
Serial Interface 3-wire (Clock, Data, Status) serial interface
Playback commands: Play, Pause, Stop, FF, FB, Fol+, Fol-, +10, -10, Volume+, Volume-, Repeat, Random (BU9434-C2)
Decoder status: Folder #, File #. Playback Time (Minute, Second), Folder Name, File Name (BU9434-C2), ID3TAG (Album, Artist, Title) (BU9434-C2), Ver. 1.0, 1.1, 2.2, 2.3, 2.4
Resume information and command (BU9434-C2)
Key-matrix Controller (BU9434-C2 is 3x4) 2x4 key matrix control: Play/Pause, Stop, FF, FB, Fol+, +10, Volume+*, Volume-*, Repeat, Random (BU9434-C2)
*Digital volume can be selected
LED Controller Play (Pause = blinks) LED
Error LED
Memory access LED
Sound Effecter (BU9434-C2)
Pop / Jazz / Rock / Classic / R&B
BassBoost / Surround
DAC I2S / SPDIF interfaces supported (BU9434-C2)
Total harmonic distortion: 0.03%
Signal to noise ratio: 93dB
Dynamic range: 88dB
Headphone Amp: 14mW (RL32O) (BU9434-C2)
Mute circuit control
http://www.rohmelectronics.com/news/pressreleasearchive/news2006.htm
Audio system LSIs sound MP3 file playback
http://www.audiodesignline.com/products/190500382
http://nigma.ru/index.php?q=BU9432&0=1&1=1&2=1&3=1&4=1&5=1&6=1&7=1&onsite=
