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参数资料
| 型号： | FSA9280AUMX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 21/30页 |
| 文件大小： | 0K |
| 描述： | IC USB MULTIMEDIA SWITCH 20-UMLP |
| 标准包装： | 1 |
| 功能： | USB 开关 |
| 电路： | 3:1 |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 4.4 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-UFQFN 裸露焊盘 |
| 供应商设备封装： | 20-UMLP（4x3） |
| 包装： | 标准包装 |
| 其它名称： | FSA9280AUMXDKR |
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2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSA9280A Rev 1.1.0
28
FS
A9
2
80A
—
US
B
Po
rt
Mu
lt
im
edia
Swi
tc
h
,
Fea
turi
n
g
Automatic
Se
lect
a
nd
Ac
ces
s
ory
Detection
11.4. Systems with Multiple USB Controllers
Many phone platforms have separate full-speed and high-
speed controllers; however, the FSA9280A only has one
designated USB switch path. The FSA9280A high-speed
USB path is only designed to allow one HS USB controller to
be multiplexed on to the USB connector. To allow for
multiple USB controllers on the USB port, it may be tempting
to use one of Fairchilds existing USB switches to multiplex
the HS and FS controllers onto the shared HS USB switch
path of the FSA9280A, as illustrated in Figure 28. It is NOT
recommended that the USB signals be multiplexed at the
input the FSA9280A DP_Host or DM_Host pins for the
following reasons:
The FSA9280A employs a passive USB switch path. It
does not buffer, amplify, or enhance the USB signal in
any way. The FSA9280A is designed to have minimal
impact on the HS USB eye performance; however, there
is some limited reduction in signal amplitude and edge
rate resulting from the inherent resistance and
capacitance of the USB switch within the FSA9280A.
Standard USB switches like the FSUSB42 are also
passive and cannot improve a USB signal. They result
in a slight degradation of the HS USB signal as well.
When placed in series, as shown in Figure 28, the
cumulative effect of the two series passive USB
switches impacts the HS eye performance and could
result in failure of the HS eye mask test per the USB 2.0
specification.
When factoring in the additional routing required for the
two switches in series and the additional signal path
discontinuities introduced, the likelihood of eye
degradation is increased.
High Speed
USB
Full Speed
USB
FSUSB42
(DPDT
USB 2.0
Switch)
D+
D-
D+
D-
DP_Host
DM_Host
FSA9280A
Vbus
DP_Con
DM_Con
ID
GND
Connector
Figure 28.
NOT RECOMMENDED
— Multiplexing
High-Speed and Full-Speed USB onto the
DP_Host, DM_Host
For the reasons outlined above, it is recommend that only
the HS USB controller be connected to the FSA9280A
DP_Host and DM_Host pins. The following solutions are
recommended for those applications that require both a HS
and FS USB controller. The FSA9280A must be used for all
of these solutions since it has the available UART switch
path. The HS USB signal is highly sensitive and should only
be routed through the specially designed HS USB signal
path of the FSA9280A. Conversely, the FS USB signal
operates at much slower data rates, which makes it much
more resilient to signal path discontinuities. FS USB only
operates at 12Mbps and has a full 3.6V swing, which makes
it much less sensitive to capacitive loading. Compared to HS
USB, FS USB has a large voltage swing, which makes it less
sensitive to switch on resistance. Therefore, the FS USB
signal can be alternately routed through the UART signal
path. Figure 29 provides an alternative application diagram.
Baseband
Full Speed
USB
UART
FSUSB42
D+
D-
FSA9280A
Vbus
DP_Con
DM_Con
ID
GND
Connector
Txd
Rxd
MAP or V/P
High Speed
USB
D+
D-
Rxd
Txd
DP_HOST
DM_HOST
RxD
TxD
Figure 29. RECOMMENDED Configuration for Systems
with High-Speed, Full-Speed, and UART
In every case where the FS USB path is not routed through
the dedicated USB path of the FSA9280A, the phone
designers must place the FSA9280A into manual mode to
configure the switch path properly. On initial attachment of a
USB accessory, the FSA9280A detects and auto-configures
for USB, resulting in the DP_Con and DM_Con pins being
connected to the DP_Host and DM_Host pins, respectively.
In this configuration, the HS USB controller is automatically
connected and no further action is needed by the baseband
to send and receive data from the HS controller. For the
application shown in Figure 29, the FSA9280A must be
changed to manual mode to enable FS USB through the
UART TxD and RxD switch paths. After initial USB detection
and attach signaled by the FSA9280A, do the following:
1.
Write the hex value 1A to the Control register (02h)
(see Table 7. Register Map). This enables Manual
Switch Mode and the FSA9280A automatically opens all
switch paths, breaking the HS USB signal path and
forcing the USB host to re-enumerate when the FS
device is configured.
2.
To configure the FSA9280A switch paths such that the
FS device is connected through the UART switch path,
write the hex value 6Ch into the Manual Switch register
(13h)
>125s
later
to
ensure
enumeration.
This
connects the RxD and TxD to DP_CON and DM_CON,
respectively.
3.
When FS USB data communication is complete, disable
manual switch mode by writing 1E back in to the
Control register (02h).
4.
Configure the FSUSB42 input select back to the UART
source to allow UART communication.
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