NUF2221W1T2(2003) 查看數據表（PDF） - ON Semiconductor
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NUF2221W1T2 Datasheet PDF : 6 Pages
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NUF2221W1T2
D1(C)
6
VBUS
5
D2(C)
4
RUP
RS
C1
C1
RS
1
2
3
D1(i)
GND
D2(i)
Figure 5. Device Description
Connection for Full- Speed and Low-Speed Devices
The USB 1.1 specification calls for two data rates:
• Full-speed devices - operates in 12 Mb/s
• Low-speed devices that work in 1.5 Mb/s.
The NUF2221W1T2 device can be shaped for either
full-speed or low-speed by connecting one of the data lines
(D+, D-) to a 3.3 V voltage supply through the 1.5 KW pull
up resistor. The device’s connection diagrams for each speed
are described as follows:
Full-Speed Connection
The Pull up resistor (RUP) is connected to the D+ Line.
The terminal 5 is connected to a 3.3 V voltage supply while
the terminal 2 is connected to ground. The input of the D+
line is connected in the terminal 1 which outputs from the
terminal 6. Finally, the input of the D- line is connected in
the terminal 3 which outputs from the terminal 4. Figure 6
shows the connections of the NUF2221W1T2 device for
“Full-Speed”.
D+
1
2
0
RS
RUP
C1
C1
6
D+
3.3 V
5
D-
3
RS
4
D-
Figure 6. Full Speed Connection
Low-Speed Connection
The Pull up resistor (Rpu) is connected to the D- Line. The
terminal 5 is connected to a 3.3 V voltage supply while the
terminal 2 is connected to ground. The input of the D- line
is connected in the terminal 1 which outputs from the
terminal 6. Finally, the input of the D+ line is connected in
the terminal 3 which outputs from the terminal 4. The
Figure 7 shows the connections of the NUF2221W1T2
device for “Low-Speed”.
D-
1
2
0
RS
RUP
C1
C1
6
D-
3.3 V
5
D+
3
4
D+
RS
Figure 7. Low Speed Connection
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