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參數(shù)資料
| 型號： | FSA9288AUMX |
| 廠商： | Fairchild Semiconductor |
| 文件頁數(shù)： | 29/30頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC USB MULTIMEDIA SWITCH 20-UMLP |
| 標(biāo)準(zhǔn)包裝： | 5,000 |
| 功能： | USB 開關(guān) |
| 電路： | 3:1 |
| 電壓電源： | 單電源 |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 4.4 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-UFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 20-UMLP（4x3） |
| 包裝： | 帶卷 (TR) |
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2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSA9280A Rev 1.1.0
8
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
4. Configuration
FSA9280A
requires
minimal
configuration
for
proper
detection and reporting. The following steps can be followed
for full configuration. In many cases, only Step 5 needs to be
implemented for proper operation.
1.
Write Control register (02h) to configure different
switching configurations and wait timing.
2.
Write Interrupt Mask 1 and 2 registers (05h, 06h) to
mask any interrupts not required in the application.
3.
Write Timing Set 1 (08h) register to program required
key-press timing and ADC-detection timing.
4.
Write Timing Set 2 (09h) register to program required
Switching Wait timing and Long Key Press timing.
5.
Write Control register (02h) to clear INT Mask bit. This
enables interrupts to the baseband.
5. Detection
The FSA9280A detection algorithms monitor both the VBUS
and ID pins of the USB interface. Based on the detection
results, multiple registers are updated and the INTB pin is
asserted to indicate to the baseband processor that an
accessory was detected and to read the registers for the
complete information.
The detection algorithm allows the application to control the
timing of the detection algorithm and the configuration of the
internal switches. The flow diagram in Figure 7 shows the
operation of the detection algorithm.
Figure 7.
Detection Flow Chart
FSA9280A Standby
Mode
Accessory Plug-in
FSA9280A Detects
Accessory Type
Is
Accessory
detected a
USB or
Factory
Mode
Set INTB Pin LOW (INT
MASK bit must have been
cleared by P)
VDDIO
=0V ?
P reads FSA9280A
Interrupt Registers
FSA9280A waits
Switching Wait time
FSA9280A auto-
conf igures switch
paths
FSA9280A Writes Device
Type registers and Attach
Interrupt
FSA9280A Writes Device
Type registers and Attach
Interrupt
FSA9280A set INTB Pin
LOW (INT MASK bit must
have been cleared by P)
P reads FSA9280A
Interrupt Registers
Wait
Bit = 1
?
FSA9280A takes no
action until Wait bit is
set HIGH by
processor
Manual
Switch =
1 ?
FSA9280A auto-
conf igures switch
paths
FSA9280A conf igures
switches according to
Manual SW 1 /2
registers
Detach
?
FSA9280A writes
Detach Interrupt and
clears Device Type
register
FSA9280A set s
INTB Pin LOW (INT
MASK bit must have
been cleared by P)
Detach
?
FSA9280A writes
Detach Interrupt
FSA9280A sets INTB
Pin LOW (INT MASK
bit must have been
cleared by P)
YES
NO
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