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FSA223 Datasheet(PDF) 4 Page - ON Semiconductor |
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FSA223 Datasheet(HTML) 4 Page - ON Semiconductor |
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4 / 18 page  © 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com FSA223 • Rev. 1.0.4 3 Functional Description The FSA223 is a combined USB and audio switch that enables sharing the D+/D- lines of a USB connector with stereo audio CODEC outputs. The switch is optimized for high-speed USB signals and includes an automatic VCC-detection circuit. The FSA223 detects the presence of VCC and defaults to USB mode. Both the USB and audio switch paths also handle negative signals, which eliminates the need for large coupling capacitors. The ASel pin is internally terminated by a resistor to GND (typical value: 3 MΩ) and results in a default USB connection. For optimal performance, VCC should be connected directly to the device battery. Application Diagram V CC V audio Switch Select Control Circuitry D+/R D-/L D+ R D- L A Sel Rpd GND GND Audio CODEC 2.7V - 5.5V USB Mini -AB Connector ID USB 2.0 Source 2.7V - 5.5V Figure 5. Typical Application |
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