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TUSB3410 Datasheet(PDF) 40 Page - Texas Instruments |
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TUSB3410 Datasheet(HTML) 40 Page - Texas Instruments |
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40 / 92 page  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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