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TUSB3410 bảng dữ liệu(PDF) 40 Page - Texas Instruments

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tên linh kiện TUSB3410
Giải thích chi tiết về linh kiện  USB TO SERIAL PORT CONTROLLER
PDF  92 Pages
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nhà sản xuất  TI [Texas Instruments]
Trang chủ  http://www.ti.com
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TUSB3410 bảng dữ liệu(HTML) 40 Page - Texas Instruments

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5–8
5.1.16 Pullup Resistor Connect/Disconnect
The TUSB3410 enumeration can be activated by the MCU (there is no need to disconnect the cable physically).
Figure 5–2 represents the implementation of the TUSB3410 connect and disconnect from a USB up-stream port.
When CONT = 1 in the USBCTL register, the CMOS driver sources VDD to the pullup resistor (PUR pin) presenting
a normal connect condition to the USB hub (high speed). When CONT = 0, the PUR pin is driven low. In this state,
the 1.5-k
Ω resistor is connected to GND, resulting in the device disconnection state. The PUR driver is a CMOS driver
that can provide (VDD – 0.1 V) minimum at 8-mA source current.
HUB
D+
D–
15 k
Ω
TUSB3410
1.5 k
Ω
CMOS
PUR
CONT-Bit
DP0
DM0
Figure 5–2. Pullup Resistor Connect/Disconnect Circuit



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