BU9437AKV-E2

Overview

The BU9437AKV-E2 is a USB host audio decoder integrated circuit manufactured by ROHM Semiconductor. It operates within an analog and digital supply voltage range of 3.0 V to 3.6 V. The device integrates a USB 2.0 Full Speed host interface, an SD memory card controller supporting MMC, SD, miniSD, microSD, and SDHC formats, and decoding capabilities for MP3 (MPEG 1, 2, 2.5 Layer 1, 2, 3) and WMA9 Standard formats. Audio output is provided via Line, I2S, or SPDIF interfaces. Communication with the system is managed through an I2C BUS serial interface. The component is housed in a VQFP64 package.

Feature Summary

• Integrates USB 2.0 Full Speed host functionality for direct playback from USB flash memory.
• Includes built-in SD memory card controller compatible with multiple storage media types.
• Supports simultaneous decoding of MP3 and WMA9 Standard audio formats.
• Provides flexible audio output options including Line, I2S, and SPDIF signals.

Applications

• Audio players requiring USB mass storage playback
• CD players with expanded media support
• Mini-component stereo systems
• Portable music players
• Car stereo units

Procurement Notes

Verify current production status and availability directly with ROHM Semiconductor or authorized distributors before design finalization. Confirm RoHS compliance documentation matches specific manufacturing dates. Ensure ordering suffixes align with required packaging configurations. Check for any end-of-life notifications or recommended replacement parts prior to procurement planning.

Selection Notes

Select this component when system requirements include both USB host connectivity and SD card slot integration within a single chip solution. Verify that the target application supports the 3.0 V to 3.6 V operating voltage range. Ensure the firmware architecture can handle the I2C control interface. Compare against BU9438AKV if AAC format decoding is also required for the specific product line.

Part Context

This part belongs to the ROHM USB Host Audio Decoder IC series designed to simplify audio device development. It consolidates host controllers, decoders, and DAC outputs into one package. The BU9437AKV variant specifically targets applications needing MP3 and WMA support without AAC decoding, distinguishing it from the BU9438AKV model which adds AAC capability.

Replacement Considerations

The BU9438AKV offers identical hardware features plus AAC decoding support. If AAC compatibility is not required, the BU9437AKV remains suitable. No other direct substitutes are documented in the provided source material.