參數(shù)資料
型號(hào): USS820D-DB
英文描述: USS-820D USB Device Controller
中文描述: 號(hào)- 820D USB設(shè)備控制器
文件頁數(shù): 50/58頁
文件大小: 868K
代理商: USS820D-DB
50
Agere Systems Inc.
Data Sheet, Rev. 4
June 2001
USB Device Controller
USS-820D
Electrical Characteristics
(continued)
Connection Requirements
USB Transceiver Connection
The physical connection of the USS-820D to the USB
bus requires only minimal components to provide
proper USB electrical terminations.
Both DPLS and DMNS require 24
±
1% series resis-
tors for USB impedance matching. Additionally, a
1.5 k
pull-up resistor is required on DPLS for full-
speed/low-speed differentiation.
5-8119
Figure 9. USB Transceiver Connection
Example for Bus-Powered
Application
When using the USS-820D in a self-powered device,
there are some additional considerations. The device
must refrain from supplying power through the pull-up
resistor if plugged into an unpowered bus. It must also
ensure that the DPLS and DMNS lines are in an appro-
priate state when the device is powered but not
plugged in. Figure 10 shows an example connection to
meet these requirements.
5-8120
Figure 10. USB Transceiver Connection
Example for Self-Powered
Application
+3.3 V
±
0.3 V
DPLS
DMNS
1.5 k
±
5%
24
±
1%
24
±
1%
DPLS
DMNS
24
±
1%
24
±
1%
+3.3 V
±
0.3 V
CLOSE SWITCH ONLY WHEN
V
BUS
IS POWERED
1.5 k
±
5%
1.5 M
1.5 M
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