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TUSB5052PZ データシート(PDF) 42 Page - Texas Instruments |
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TUSB5052PZ データシート(HTML) 42 Page - Texas Instruments |
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42 / 82 page  5−8 USBCTL Register GLOBCTL Register PURS USBR RESET MCU FRSTE USB Function Reset To Internal MMRs RSTI RSTO G2 8052 RST TUSB5052 RSTO RSTI External Mode Connection TUSB5052 RSTO RSTI Normal Mode Connection Figure 5−1. Reset Diagram 5.15 Pullup Resistor Connect/Disconnect TUSB5052 numeration can be activated by the MCU (there is no need to disconnect the cable physically). Figure 5−2 represents the implementation of the TUSB5052 Connect and Disconnect from a USB upstream 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 TUSB5052 1.5 k Ω CMOS PUR CONT-bit DP0 DM0 Figure 5−2. Pullup Resistor Connect/Disconnect Circuit |
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