参数资料
型号: FSA9288AUMX
厂商: Fairchild Semiconductor
文件页数: 3/30页
文件大小: 0K
描述: IC USB MULTIMEDIA SWITCH 20-UMLP
标准包装: 5,000
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: 带卷 (TR)
2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSA9280A Rev 1.1.0
11
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A9
2
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US
B
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Automatic
Se
lect
a
nd
Ac
ces
s
ory
Detection
The following figures show the attach timing of the USB
accessories and the relationship between the INTB assertion
and the CHG_DET assertion. FSA9280A implements the
optional data contact detection (DCD) feature of the USB
Battery Charging specification. The DCD detection ensures
proper connection of the DP_CON and DM_CON before
starting the USB charging detection scheme. This feature
allows for shorter attach times by eliminating long wait times
to allow full contact of the DP_CON and DM_CON pins.
VBUS Voltage
VBUS_OUT
Charger FET Closed
INTB Asserted and
registers written
VBUS >4.0V
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
FLOAT
ID Resistance
DCD-20ms
CHG DETECTION 150ms
INTB Pin
100ms
CHG_DET Pin
Switch State
170ms
Closed (CDP Only)
Figure 9. USB Dedicated Charging Port (DCP) or Charging Downstream Port (CDP) Attach Timing
130ms
VBUS_IN
VBUS_OUT
USB Switch State
Charger FET Closed
USB Switches Closed
VBUS >4.0V
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
FLOAT
ID Resistance
Closed
Open
DCD Checking 20ms
Charger Detection Time 110ms
Figure 10.
USB Standard Downstream Port Attach Timing
VBUS Voltage
VBUS >4.0V
ID Resistance
XXXXXXXX
FLOAT
VBUS_OUT
ID Detection Time 200ms
INTB Pin
200ms
100ms
CHG_DET Pin
Switch State
Charger FET Closed
Configured Switches Closed
Open
Figure 11.
Car Kit Type 1 and 2 Attach Timing
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