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FSA321UMX Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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FSA321UMX Datasheet(HTML) 3 Page - Fairchild Semiconductor |
3 / 12 page © 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com FSA321 • Rev.1.0.6 3 Functional Description The FSA321 is a combined USB and audio switch that enables sharing the D+/D- lines of a USB connector with stereo audio CODEC outputs. The USB Sel pin has an internal pull-down resistor that results in a default audio- mode configuration. The switch can be configured for auto USB detection by connecting the VBUS pin to the USB Sel pin. The audio switch path also handles negative signals, eliminating the need for large coupling capacitors and greatly reducing the potential for audio pop. Termination resistors on the audio R and L ports are enabled when the switch is in USB mode, this also helps reduce audio pop when enabling the audio path. The FSA321 allows for an audio override state by forcing A/LP Sel high when USB Sel is high. This is useful for USB car kit applications or if the device is in a cradle charger when “Send/End” is pressed. Application Diagram USB 2.0 Hi-Speed Controller Audio CODEC FSA321 D+ D- R L D+/R D-/L USB Sel VCC 0.1µF Figure 3. Typical Application Diagram |
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