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FSA321 데이터시트(PDF) 3 Page - ON Semiconductor

부품명 FSA321
상세설명  Audio Switches with Negative Signal Capability
PDF  14 Pages
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FSA321 데이터시트(HTML) 3 Page - ON Semiconductor

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© 2007 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSA321
• Rev.1.0.6
2
Pin Configuration
VCC
GND
1
8
5
4
3
2
D +
D -
R
L
D +/R
D-/L
A/LP Sel
USB Sel
9
10
6
7
Figure 2. UMLP
Pin Definitions
Pin #
Name
Description
9
VCC
Power supply
5
A/LP Sel
Audio Select Override and Power-Save Mode. This pin can be used to override USB Sel for
applications where analog audio is transmitted on the USB D+, D- lines. This same select pin is
used to put the FSA321 in low-power mode when USB Sel is LOW, not transmitting audio signals
or USB data. The FSA321 has a weak internal pull-down, setting its default state to LOW and
allowing this pin to float when not in use.
8
USB Sel
USB Path select pin. Can be connected to USB connector VBUS pin for automatic USB detection.
10, 1
D+, D-
USB data bus input sources
2, 3
R, L
Audio right and left input sources
7, 6
D+/R, D-/L USB and audio common connector ports
Truth Table
VCC
USB Sel
(1)
A/LP Sel
Audio Mode
USB Mode
Remarks
LOW
OFF
OFF
Disabled Inputs High-Z
HIGH
(2)
HIGH
(2)
LOW
OFF
ON
USB Communication
HIGH
(2)
HIGH
(2)
HIGH
(2)
ON
OFF
Audio Override on USB
HIGH
(2)
LOW
HIGH
(2)
OFF
OFF
Low Power Mode
HIGH
(2)
LOW
LOW
ON
OFF
Audio Out
Notes:
1.
Forcing USB Sel HIGH when VBUS is present allows for automatic USB detection.
2.
HIGH is the threshold as defined to meet USB2.0 VCC requirements and audio supply threshold in a system
(see DC Tables).



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