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Fairchild focuses micro-USB solutions as key to differentiating mobile designs

June 08, 2010 | Paul Buckley | 222901037
Fairchild focuses micro-USB solutions as key to differentiating mobile designs Fairchild Semiconductor has developed a new USB transceiver and USB accessory detection switch that offers functional enhancements without adding design complexity or increasing space and power in mobile designs.
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The predicted strong growth of the smartphone market, which is forecast by market analysts, iSuppli, to reach sales of almost 440 million units, is driving Fairchild to release the new devices in a move which aims to maintain what the company perceives as its market leading position in the USB technology arena.

The industrys convergence into one universal interface (the micro-USB) for mobile phone applications is posing a series of design challenges which Fairchilds broad signal path expertise is planning to address. Fairchilds micro-USB switch (FSA9280A) and USB transceiver (FUSB2500) claims to offer a number of design advantages including:

Space-Savings. By integrating a MOSFET and USB IP into one IC, the FSA9280A claims to eliminate at least five additional components and reduces Bill of Material (BOM) costs.

Auto Detection. The FSA9280A automatically detects accessories and configures the proper path for each accessory. The device can detect every accessory and charger in the market, and has a number of reserved resistors to accommodate new accessories such as glucometers, e-frames and audio docks. The FUSB2500 has an integrated charger detect that allows detection without additional component count.

Power Savings. The FSA9280A uses advanced sampling methods to minimize power consumption in the standby state, extending battery life. It also provides a negative switch capability in audio applications without consuming power; alternative solutions need a charge pump for this. Both the FSA9280A and FUSB2500 offer a low power down function that puts the device in standby when functions are not in use.

Audio Fidelity. Utilizing Fairchilds signal and audio expertise, the FSA9280A features low Total Harmonic Distortion (THD) of 0.1 percent to optimize performance.

Robust Protection Functions. The FSA9280A features many built-in protection functions and the FUSB2500 offers high ESD protection, 6 kV HBM, exceeding the 2 kV standard.

Everything is going into the one device - the smartphone - and all the accessories are going to be connected to the device via the micro-USB port, explained Aranzazu Diaz Valdivieso, Fairchild's European Product Marketing Manager for Signal Path products.. With so many new functions and so many new accessories we need a common port to support all of these accessories.

The first design challenge that has to be faced is saving space. With the current solutions on the market, if you want to have a common connector for all the accessories you want to connect to your mobile phone you will need more than five components. These will include a USB Switch, an audio switch, a MOSFET, Over Voltage Protection devices, Charger Detect components as well as an ADC. This takes up a lot of space in your circuitry. Fairchild is offering the FSA9280A which is replacing all of these components. The new accessory switch is a highly integrated single chip solution. With this solution you can just stick an accessory in to your mobile phones micro-USB port and the FSA9280A will recognize what kind of accessory it is and will switch the power path accordingly.

Fairchild claims the FSA9280A allows for every conceivable form of accessory and five future definable accessories, ushering in a full multi-media experience. The FSA9280A packs data, charging, audio, headset and other accessory connectivity into one solution. Through its optimization of power, both of these products feature a power saving mode to help extend battery life for digital still cameras, portable medical and mobile applications. Through its audio expertise, Fairchild maintains signal integrity while adding new functionality. And by integrating and packing performance into small packages, Fairchild is aiming to offer the smallest designs possible.

Fairchild was the first to develop USB switches and has been supporting USB transceivers for more than a decade. Fairchild says it will continue to invest in USB solutions that advance mobile designs and enrich the user experience. In October 2009 Fairchild introduced its FSA800 device which at the time was claimed to be the smallest USB accessory switch with built-in charger detection. The FSA9280A heralds a further advance in the USB accessory switch arena.

Availability and Pricing

Samples of the FSA9280A and FUSB2500 are available now. The standard lead-time for both products is eight weeks. The price for the FSA9280AUMX is 1.00 US Dollars each per 1000 pcs. The price for the FUSB2500UCX is 1.00 US Dollars each per 1000 pcs.

Datasheets:

FUSB2500

FSA9280

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