© 2010 Fairchild Semiconductor Corporation
FSA801 • Rev.1.0.2
FSA801 — USB2.0 High-Speed (480Mbps), UART, and
Audio Switch with Negative Signal Capability
Features
Applications
Ordering Information
Part Number
FSA801UMX
3:1 Switch Handles:
-
-
-
USB Charger Detection and Indication, Compliant
with USB Battery Charging Specification, Rev 1.1
-
Negative-Swing-Capable Audio Channel
Built-in Termination Resistors for Audio Pop
Reduction
Simple Switch Control Using Three Select Pins
28V Over-Voltage Tolerance on V
Cell Phones, MP3 Players, PDAs
Audio Headsets
UART
Up to Two High- and Low-Speed USB Data
Supports Data Contact Detect (DCD)
Temperature Range
Baseband
Processor
HS USB
HS USB
FS USB
FS USB
Codec
Audio
UART
UART
-40 to +85°C
Operating
ID Detect
DM_HOST2
DM_HOST1
MIC_HOST
DP_HOST1
DP_HOST2
BUS
R_HOST
L_HOST
R
SEL[0]
SEL[1]
SEL[2]
CD_N
VCC
Figure 1. Typical Application
Top Mark
Control
R
Switch
KL
MUX
3:1
FSA801
Description
The FSA801 is a 3:1 USB accessory switch that enables
USB data, stereo and mono audio, microphone, and
UART data to share a common connector port. Two
ports are designed for high-speed USB 2.0 signaling,
while also capable of full-speed USB and UART
communication. The architecture allows audio signals to
swing below ground so a common USB and headphone
jack can be used for personal media players and
portable peripheral devices.
FSA801 detects wall chargers through a dedicated pin
that provides the baseband with charger detection. The
charger function is compliant with USB Battery Charging
Specification, Rev 1.1, implementing Data Contact Detect
(DCD) before detecting a charger. The FSA801 indicates
if a Dedicated Charging Port (DCP) or a Charging
Downstream Port (CDP) has been connected.
The FSA801 meets both USB Rev. 2.0 and micro-USB
specifications.
16-Lead Quad, 1.8 x 2.6mm Ultrathin Molded
Leadless Package (UMLP)
Charger
Detect
OVT
V
DP_CON
GND
DM_CON
BUS
ID
USB Port
Package
January 2011
www.fairchildsemi.com