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ROHM Semiconductor, USA LLC - ROHM’s Audio System LSI Solution
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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.
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
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