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ST5481 数据表(PDF) 7 Page - STMicroelectronics |
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ST5481 数据表(HTML) 7 Page - STMicroelectronics |
7 / 18 page ST5481 7/18 7 - POWER MANAGEMENT The device can be supplied by the USB bus power lines VBUS (5 volts) and GNDBUS (ground). This is enabled when RPSM (remote power supply mode) is at logic one. Then on-chip regulators bring 3.3 volts to internal analog and digital blocks. When RPSM is high, a supply is brought to external devices through pins GNDD1, VREGD1, GNDD2, VREGD2, GNDA, VREGA. The power budgeting is done by the host when initializing the pipe: The needed information (maximum power consumption) is adjusted through pins CFG0, CFG1 and as well as RPSM for “remote wake up ability” information. The following mechanism is used to do "a get description device". Figure 4 : Bus-Powered Mode (RPSM=1) ST 5481 VBUS RPSM GNDBUS VREGD1 GNDD1 VREGD2 GNDD2 VREGA GNDA From To other To other 8 5 3 4 44 34 35 6 7 digital analog device device USB bus Figure 5 : Self Powered Mode (RPSM=0) ST 5481 VBUS RPSM GNDBUS VREGD1 GNDD1 VREGD2 GNDD2 VREGA GNDA From 8 5 3 4 44 34 35 6 7 From 3.3V externally regulated supplies USB bus |
类似零件编号 - ST5481 |
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类似说明 - ST5481 |
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