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参数资料
| 型号： | 20H04 |
| 厂商： | SMSC Corporation |
| 英文描述： | 4-PORT USB2.0 HUB CONTROLLER |
| 中文描述： | 4端口USB2.0集线器控制器 |
| 文件页数： | 13/38页 |
| 文件大小： | 919K |
| 代理商： | 20H04 |
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4-Port USB2.0 Controller
Datasheet
SMSC USB20H04
Page 13
Revision 1.63 (10-14-04)
DATASHEET
Table 4.3 - USB I/O Signals
NAME
BUFFER
TYPE
IO-U
IO-U
IO8
ACTIVE
LEVEL
N/A
N/A
N/A
DESCRIPTION
USBDP0
USBDM0
VBUSDET
Upstream USB Positive Data Pin.
Upstream USB Negative Data Pin.
Detects state of upstream V
BUS
power. When designing a detachable
hub, this pin must be connected to the V
BUS
power pin of the USB port
that is upstream of the hub.
For self-powered applications with a permanently attached upstream
host, this pin must be connected to either 3.3V or 5.0V (typically
VDD3.3).
The USB20H04 monitors VBUSDET to determine when to assert the
internal D+ pull-up resistor (signaling a connect event). When using the
SRP feature, it is necessary to add a 100k ohm resistor from this pin to
VSS in order to properly dissipate the upstream V
BUS
Pulse (pulsed with
an 8mA drive capability).
USB Positive Data Pin to downstream port 1.
USB Negative Data Pin to downstream port 1.
Enables power to downstream port 1.
Over-Current Sense input. Internal pull-up resistor to 3.3V.
Enables green indicator to downstream port 1.
Enables amber indicator to downstream port 1.
USB Positive Data Pin to downstream port 2.
USB Negative Data Pin to downstream port 2.
Enables power to downstream port 2.
Over-Current Sense input. Internal pull-up resistor to 3.3V.
Enables green indicator to downstream port 2.
Enables amber indicator to downstream port 2.
USB Positive Data Pin to downstream port 3.
USB Negative Data Pin to downstream port 3.
Enables power to downstream port 3.
Over-Current Sense input. Internal pull-up resistor to 3.3V.
Enables green indicator to downstream port 3.
Enables amber indicator to downstream port 3.
USB Positive Data Pin to downstream port 4.
USB Negative Data Pin to downstream port 4.
Enables power to downstream port 4.
Over-Current Sense input. Internal pull-up resistor to 3.3V.
Enables green indicator to downstream port 4.
Enables amber indicator to downstream port 4.
USBDP1
USBDM1
VBUS1_N
OCS1_N
GR1_N
AM1_N
USBDP2
USBDM2
VBUS2_N
OCS2_N
GR2_N
AM2_N
USBDP3
USBDM3
VBUS3_N
OCS3_N
GR3_N
AM3_N
USBDP4
USBDM4
VBUS4_N
OCS4_N
GR4_N
AM4_N
IO-U
IO-U
O8
IPU
OD8
OD8
IO-U
IO-U
O8
IPU
OD8
OD8
IO-U
IO-U
O8
IPU
OD8
OD8
IO-U
IO-U
O8
IPU
OD8
OD8
N/A
N/A
Low
Low
Low
Low
N/A
N/A
Low
Low
Low
Low
N/A
N/A
Low
Low
Low
Low
N/A
N/A
Low
Low
Low
Low
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