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UPSD3422 bảng dữ liệu(PDF) 170 Page - STMicroelectronics

tên linh kiện UPSD3422
Giải thích chi tiết về linh kiện  Turbo Plus Series Fast Turbo 8032 MCU with USB and Programmable Logic
PDF  293 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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USB interface
uPSD34xx
170/293
25.5
Typical connection to USB
Connecting the uPSD34xx to the USB is simple and straightforward. Figure 56 shows a
typical self-powered example requiring only three resistors and a USB power detection
circuit. The USB power detection circuit detects when the device has been connected to the
USB. When VBUS is detected, it switches 3.3V to the pull-up resistor on the D+ line. Per the
USB specification, the pull-up resistor on D+ is required to signal to the upstream USB port
when a full speed device has been connected to the bus. The resistors in series in the D+
and D– lines are recommended per the USB specification to reduce transients on the data
lines.
Figure 56.
Typical self powered example
USB Power
Detection Block
22
Ω
VBUS
VCC
D–
D+
GND
USB–
USB+
GND
VCC
VDD
VCC
VDD
22
Ω
USB
uPSD34xx
1.5K
Ω
+3.3V
AI10495



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