The semiconductor manufacturer ROHM Co., Ltd. has developed a USB HOST audio decoder IC with superior electrostatic damage resistance for home audio or portable audio such as stereo components, BoomBox, AV receiver, and for car audio that requires high surge resistance. BU9457KV" (compatible with MP3 player), "BU9458KV" (compatible with MP3, WMA, AAC playback). Samples of these two products have been available since July 2009 (sample price is 2,000 yen/piece), and will be produced in batches of 100,000 units per month in October 2009. The preliminary process of the production process was carried out at the headquarters of ROHM Co., Ltd. (Kyoto City), and the assembly process was completed at ROHM INTEGRATED SYSTEMS (THAILAND) CO. LTD. (Thailand).
In recent years, as a medium for recording audio files in place of CDs, USB memories and SD memory cards that can be easily written at high speed have attracted attention, and in the future, as the capacity of flash memory increases, the demand will further increase. In response to these needs, ROHM developed a small single-chip USB HOST audio IC series to support the corresponding file format, which has been well received by users. However, in order to prevent erroneous work caused by noise from other devices and wiring, it is necessary to protect the circuit, especially for the harsh environment such as car audio, in addition to the need for surge noise protection diodes and resistors, Countermeasures such as an external pin protection IC are required.
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The "BU9457KV" and "BU9458KV" developed this time have improved the communication error recovery circuit of the USB interface part, and reduced the influence of noise on the USB communication error. As a countermeasure against the surge, the electrostatic breakdown resistance of the USB pin is ±6KV ( The traditional product is ±4KV). In addition, in the electrostatic discharge immunity test IEC 61000-4-2 level standard 4 specification, even if the air discharge is 15KV (the traditional product is 13KV), the direct discharge is 8KV (the traditional product is 2.5KV), and it can continue to work normally. High reliability. Therefore, the pin protection IC required for the conventional USB pin is not required, and the design of the high-reliability audio circuit is simplified and the system is miniaturized.
ROHM's USB HOST audio decoder IC adds interface hardware for USB HOST controller and SD memory controller. It is built-in D/A converter, sample rate converter, and compressed audio file decoder in a small VQFP64 package (12mm × 12mm). The file system controls the system controllers at the same time to realize the music playback of the USB memory and the SD memory card on a single chip. In order to make the compact application design easy, the complex instruction control of the necessary microcontroller of the traditional product uses the built-in system controller to realize simple command control such as play, stop, fast forward, and rewind. Therefore, the USB HOST audio system can be constructed by simply adding it to the device. In addition to the audio device, it can also be widely applied to home appliances such as massage chairs and alarm clocks that do not support audio output.
This time, we added a two-product product line with superior electrostatic damage resistance, which ensures high reliability for a wide range of applications. For noise countermeasures led by automobiles, the application of surge countermeasures can also easily input audio functions. It is beneficial to expand the scope of new applications.
In addition, the "BU9457KV" compatible with MP3 playback and the "BU9458KV" compatible with MP3, WMA, and AAC are pin-compatible (VQFP64 package). Thanks to the use of the dual-use control software, it can be upgraded to use without changing the device design. Convenient and simple IC.
In the future, ROHM will continue to develop products that are easy to use and meet the needs of users, and strive to further expand the product line.
• Built-in interface hardware, decoder, file system, system controller, music playback of USB memory and SD memory card on a single chip.
• The electrostatic breakdown resistance of the USB pin is ±6kV.
• Superior surge noise resistance (15KV for air discharge and 8kV for direct discharge).
• Small VQFP64 package (slice size 12mm × 12mm).
• "BU9457KV" and "BU9458KV" are installed with pin interchangeability, compatible control software, and easy to upgrade.
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