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FSA201 Datasheet(PDF) 3 Page - Fairchild Semiconductor

No. de Pieza. FSA201
Descripción  USB2.0 Full-Speed and Audio Switches with Negative Signal Capability
Descarga  19 Pages
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Fabricante  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
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FSA201 Datasheet(HTML) 3 Page - Fairchild Semiconductor

 
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© 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSA201 Rev. 1.1.9
3
Functional Description
The FSA201 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 full-speed USB signals and includes an automatic
Vbus-detection circuit. When a USB connector, rather
than a headphone, is connected to the ultra-portable
device the switch is automatically configured for full-
speed USB data transfer. If no Vbus is detected, and yet
VAUDIO is present, the switch is configured for the low-
distortion audio switch path. The audio switch path also
handles negative signals (down to -2V), which
eliminates the need for large coupling capacitors.
For those applications where the Vbus is generated as a
self-powered device or where Vbus is not removed, the
ASel pin provides the ability to switch, under software
control, to the audio path. The ASel pin is internally
terminated by a resistor to GND (typical value 3M
Ω) and
requires no connection for the standard ultra-portable
(cell-phone, MP3, or Portable Media Player). In an
application where the supply to the FSA201 Vbus pin is
not guaranteed to be removed, a GPIO pin can be used
to switch out of full-speed USB mode into audio mode,
using the ASel pin.
The FSA201 Vbus pin must be connected directly to Vbus
or a supply > 3.8V, not an LDO regulated down to 3.6V
or a Vbat-generated supply that may fall below 3.8V in
normal operation (see the Application Diagram).
Application Diagram
V
bus
V
audio
Switch Select
Control Circuitry
D+/R
D-/L
D+
R
D-
L
A
Sel
Rpd
GND
GND
5V
Audio
CODEC
FS-USB
Source
3.0V - 3.6V
USB
Mini-AB
Connector
V
bus
ID
Figure 4.
Application Diagram


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