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參數(shù)資料
| 型號(hào)： | FSA801UMX |
| 廠商： | Fairchild Semiconductor |
| 文件頁(yè)數(shù)： | 5/12頁(yè) |
| 文件大小： | 0K |
| 描述： | IC SWITCH USB/UART/AUDIO 16UMLP |
| 標(biāo)準(zhǔn)包裝： | 5,000 |
| 功能： | USB 開(kāi)關(guān) |
| 電路： | 3:1 |
| 導(dǎo)通狀態(tài)電阻： | 9 歐姆（USB），3 歐姆（音頻） |
| 電壓電源： | 單電源 |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 4.4 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-UFQFN |
| 供應(yīng)商設(shè)備封裝： | 16-UMLP（1.8x2.6） |
| 包裝： | 帶卷 (TR) |
2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSA801 Rev. 1.0.3
2
FSA801
—
USB2.0
High-Speed
(480Mbps),
UART,
a
nd
Audio
Switch
with
Negative
Signal
Capability
Functional Description
The FSA801 USB2.0 accessory switch is designed to
consolidate wired accessories for portable devices, such
as cellular telephones and portable audio players. The
benefits
of
consolidation
include
reduced
space
requirements from a reduction of connectors and their
size. The micro-USB connector, for example, reduces
connector height and depth, allowing for slimmer overall
designs. Using the USB industry standard and a common
connector type for accessories such as chargers and
headsets, greatly reduces the waste associated with new
phone purchases by allowing re-use of the accessories.
Using just five wires for all connection types
considerably reduces the cost of wired accessories and
simplifies their construction. The FSA801 facilitates
adopting this methodology because it is designed to
redirect the DP/DM pins from the USB connector to one
of three ports at the baseband’s discretion. Additional
flexibility is provided by the ability of the microphone line
to be switched from either the DP_CON or VBUS pin.
The VBUS pin is protected up to 28 V without damage
to the FSA801.
USB Charger Detection / Data Contact Detect
The FSA801 senses the presence of USB chargers per
the USB Battery Charging Specification, Version 1.1.
This specification uses VBUS status and measurements
on DP_CON / DM_CON pins to determine that a
charging device might be attached. The ‘CD_N’ pin goes
to a low state, indicating the presence of a charger. The
charger-detect algorithm executes when VBUS is valid.
The charger-detection algorithm detects both Dedicated
Charging Ports (DCP) and Charging Downstream Ports
(CDP).
In this implementation, per the USB Battery Charging
Specification, Version 1.1
, the FSA801 implements Data
Contact Detect (DCD) to insure the D+ and D- pins have
made contact before the dedicated charger detection is
performed.
Since the BC1.1 charger detection algorithm applies and
detects signals on the D+ and D- lines, any additional
loading effects from portable device host side of the
switch would cause the results to be invalid. To prevent
interference due to any loading, the FSA801 only
performs charger detection when all switches are open.
Additionally, if all switches are open and VBUS is present,
the FSA801 does not close any switch path until the
DCD circuitry detects contact with the D+/D- pins and
the charger detection is complete. If the D+/D- pins
never contact, but VBUS is present, the USB switches
cannot be closed when configuring from SEL[2:0]=’000’
to SEL[2:0]=’001’ or SEL[2:0]=’010’. To override this
blocking, first switch to a non-USB mode (one of the
audio modes, SEL[2:0]=’011’,’100’ or ‘101’), and then to
the desired USB mode.
If the USB physical layer device that the FSA801 is
connected to also performs DCD, it should not start until
after the FSA801 has time to finish its detection function
(since the delay between VBUS connection and D+/D-
connection is not defined, this detection function time
cannot be defined either).
Glitches on VBUS that occur when VBUS is not driven
(positive voltage spikes and on-off situations at the
beginning of a cable attach) are automatically filtered by
the DCD state machine timing.
To manually reset the FSA801 to search for a charger
again, switch to SEL[2:0]=‘111’ for a minimum of 30 s.
After this state machine is reset, the next time that
SEL[2:0]=‘000’ (all switches open) for a minimum of
30 s, the FSA801 begins the charger detection
sequence.
PLEASE NOTE
: The FSA801 is guaranteed to operate
down to 2.4 V. If the FSA801 VCC is connected directly
to a battery and falls below 2.4 V, the FSA801 may not
correctly detect a charger. If a charger is applied, the
VCC should start to rise above 2.4 V. In this situation, the
FSA801 does not automatically check for a charger
again,
so
the
FSA801
should
be
placed
in
SEL[2:0]=’111’ for 30 s (min.), then SEL[2:0]=’000’ for
30 s (min.) to perform the charger detection again.
Applications with Multiple USB Controllers
When operating with two USB controllers, it is
recommended to configure the switches to OPEN before
switching to the other (second) USB interface. The
OPEN setting duration should be long enough for the
accessory to go to a SE0 state, so when the switch is
set to the other (second) USB port, the new controller
re-enumerates.
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