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USB IC supports all-passive audio accessories

Posted: 12 Nov 2009 ?? ?Print Version ?Bookmark and Share

Keywords:USB? interface? audio accessory? consumer electronics?

Freescale Semiconductor debuts a mini-USB interface IC that makes it possible to design smaller and sleeker consumer products by enabling just one mini-USB connector for all external accessories. These include chargers, headsets, microphones and audio/data connections.

Aside from saving valuable board space by eliminating the need for multiple connections, the MC34825 analog IC also lowers power consumption and extends battery life by supporting all-passive audio accessories such as stereo audio, microphone and cord remote control functionality.

"The MC34825 leverages Freescale's 15 years of experience in delivering portable power management solutions that help our customers differentiate in competitive consumer electronics markets," said Scott Ward, VP and general manager of Freescale's analog, mixed-signal and power division. "This IC helps consumer device manufacturers give consumers what they wantsmaller form factors and a single connection that eliminates the need for multiple adapters and cords."

Applications for the MC34825 include smartbooks, netbooks, eBooks, mobile phones, smart phones, portable media players, PNDs, DSCs and camcorders.

The MC34825 uses intelligent switching to identify up to 32 different accessory types, such as headsets, microphones and chargers. It automatically identifies the attachment and informs the host system, switching the signal or setting the charge current based on the plugged-in charger.

As a universal charging solution, the MC34825 supports multiple charger types including AC, DC and USB. The IC identifies the battery charger type and sets the charge current level accordingly. Additional battery charging features include up to 28V OVP for the VBUS power input, ultralow operating current (The MC34825 USB interface IC is available now from Freescale and its distributors. Suggested resale pricing for the MC34825 is $ 0.82 in 10,000-piece quantities.

For application notes on USB click here.





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