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參數(shù)資料
| 型號： | STF202-22 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | USB Filter with ESD Protection(帶ESD保護(hù)功能的USB濾波器) |
| 中文描述： | 濾波器的USB ESD保護(hù)（帶靜電放電保護(hù)功能的的USB濾波器） |
| 文件頁數(shù)： | 4/8頁 |
| 文件大小： | 54K |
| 代理商： | STF202-22 |
STF202–22
http://onsemi.com
4
As previously mentioned, there are two types of
configurations for the USB port which are upstream and
downstream. If your port connects to the host either in a
direct way or through a hub, you are upstream (data flows
“up” to the host) and in the other hand, if you are the host or
your port provides access to the host then you are
downstream (data flows “down” from the host to the
device). In the case of the
STF202
device, it provides
upstream termination. The Figure 7 represents the
termination for an upstream USB port.
Figure 7.
Rpu
C
C
R
S
R
S
V
CC
The USB Line termination is reached through the series
resistors placed in the D+ and D– lines. These resistors
insure the proper termination to maintain the integrity of the
signal. The Pull up Resistor of 1.5 k on either the D+ or D–
data lines is used to identify the equipment as either
full–speed or low–speed device.
Connection for Full–Speed
and Low–Speed Devices
As mentioned before, there are two kinds of port devices:
Full–Speed devices – operates in 12 Mb/s
Low–Speed devices that work in 1.5 Mb/s
The STF202 device can be shaped to be used for either
Full–Speed or Low–Speed devices which is achieved as
described below:
Full–Speed Devices
The Pull up resistor (Rpu) is connected to the D+ Line.
The terminal 1 is connected to the Voltage Supply Line
(V
BUS
) while the terminal 6 is connected to ground. The
input of the D+ line is connected in the terminal 3 which
outputs from the terminal 4. Finally, the input of the D– line
is connected in the terminal 2 which outputs from the
terminal 5. The Figure 8 shows the connections of the
STF202 device for “Full–Speed devices”.
Figure 8.
GND
D–
D+
STF202
6
5
4
1
2
3
USB
Controller
D–
D+
3.3 V
Peripheral
Low–Speed Devices
The Pull up resistor (Rpu) is connected to the D– Line. The
terminal 1 is connected to the Voltage Supply Line (V
BUS
)
while the terminal 6 is connected to ground. The input of the
D– line is connected in the terminal 3 which outputs from the
terminal 4. Finally, the input of the D+ line is connected in
the terminal 2 which outputs from the terminal 5. The Figure
9 shows the connections of the STF202 device for
“Low–Speed devices”.
Figure 9.
GND
D+
D–
STF202
6
5
4
1
2
3
USB
Controller
D+
D–
3.3 V
Peripheral
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STF202-22.TC | 制造商:Semtech Corporation 功能描述:EMI Filter Gull Wing SMD |
| STF202-22.TCT | 制造商:Semtech Corporation 功能描述:EMI Filter Gull Wing SMD T/R 制造商:Semtech Corporation 功能描述:TVS Diode 制造商:Semtech Corporation 功能描述:DIODE ARRAY TVS 5.25V |
| STF202-22.TCT | 制造商:Semtech Corporation 功能描述:TVS Diode |
| STF202-22_04 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:USB Upstream Port Filter and TVS |
| STF202-22T1 | 功能描述:電磁干擾濾波器 Upstream USB Port RoHS:否 制造商:STMicroelectronics 電容:12 pF 電路類型: 最大直流電流: 最大直流電阻: 電壓額定值:6 V 容差: 端接類型:SMD/SMT 工作溫度范圍:- 30 C to + 85 C 系列:EMIF03 |
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