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ST5481TQF7 数据表(PDF) 7 Page - STMicroelectronics

部件名 ST5481TQF7
功能描述  L.O.U.I.S - LOW COST USB ISDN SOLUTION
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST5481TQF7 数据表(HTML) 7 Page - STMicroelectronics

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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


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