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UPSD3422 Datasheet(PDF) 170 Page - STMicroelectronics |
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UPSD3422 Datasheet(HTML) 170 Page - STMicroelectronics |
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170 / 293 page  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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