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USB3300 数据表(PDF) 13 Page - SMSC Corporation |
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USB3300 数据表(HTML) 13 Page - SMSC Corporation |
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13 / 49 page ![]() Hi-Speed USB Host, Device or OTG PHY with ULPI Low Pin Interface Datasheet SMSC USB3300 13 Revision 1.06 (07-19-06) DATASHEET 31 REG_EN I/O, CMOS, Pull-low N/A On chip 1.8V regulator enable. Should be connected directly to pin 30 to enable regulators. Connect to ground to disable on chip VDDA1.8V and VDD1.8V regulators. If regulators are disabled, external 1.8V must be supplied to VDDA1.8 and VDD1.8 pins. 32 RBIAS Analog, CMOS N/A External 12KΩ +/- 1% bias resistor to ground. GND FLAG Ground N/A Ground. The flag must be connected to the ground plane with a via array under the exposed flag. This is the main ground for the IC. Table 3.1 USB3300 Pin Definitions 32-Pin QFN Package (continued) PIN NAME DIRECTION, TYPE ACTIVE LEVEL DESCRIPTION |
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