參數(shù)資料
型號(hào): USB20H04-JD
廠商: STANDARD MICROSYSTEMS CORP
元件分類(lèi): 總線控制器
英文描述: 4-PORT USB2.0 HUB CONTROLLER
中文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP64
封裝: 10 X 10 MM, 1.40 MM THICKNESS, TQFP-64
文件頁(yè)數(shù): 19/38頁(yè)
文件大?。?/td> 919K
代理商: USB20H04-JD
4-Port USB2.0 Controller
Datasheet
SMSC USB20H04
Page 19
Revision 1.63 (10-14-04)
DATASHEET
Chapter 7
Functional Overview
Figure 2.1 shows the functional block diagram of the USB2.0 Hub Controller. Each of the functions is
described in detail below.
7.1
Bus-Power Detect
The VBUSDET pin on the USB20H04 monitors the state of the upstream V
BUS
signal and will not pull-up
the DP0 resistor if V
BUS
is not active. If V
BUS
goes from an active to an inactive state (not powered), the
USB20H04 will remove power from the DP0 pull-up resistor within 10 seconds.
To support a dual-role OTG host on the upstream port, the USB20H04 has the ability to pulse the inactive
V
BUS
line. This is defined as V
BUS
pulsing in the OTG specification. For a more detailed discussion of the
“Application Note 10.4 Using the USB20H04 with an OTG
相關(guān)PDF資料
PDF描述
USB20H04-JT 4-PORT USB2.0 HUB CONTROLLER
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