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ST5481 数据表(PDF) 9 Page - STMicroelectronics

部件名 ST5481
功能描述  L.O.U.I.S - LOW COST USB ISDN SOLUTION
Download  18 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST5481 数据表(HTML) 9 Page - STMicroelectronics

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ST5481
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8 - DEVICE STATES
The device complies with USB rev 1.1 power
management requirements.
It
complies
with
I430
power
management
requirements.
Due to inactivity on the USB bus for more than 3
ms, the device may enter into the SUSPEND
mode even if Reset signalling is not done yet.
The ST5481 recovers activity within the 15ms of
the resume signalling issued by the host or hub.
If wake up is enabled and occurs, the ST5481
recovers activity within the 15ms when it initiates
the resume (K state) and about the same time the
host or hub initiates a Reset (SEO for 10 ms).
Wake up ability concerns wake up of the USB bus
(resume event when the bus is in a suspend state)
from the S line through a line signal detection
done by the S interface.
Interface S states and relationship with Device
versus USB States.
M1: QUIET mode (initial mode if CFG1 = 0).
It means that S interface cannot be activated
neither by the host nor by a detection of signal on
line. This signal detection is disabled. The 15MHz
oscillator is not addressed to MACRO-S
M2: ACTIVE Mode.
When the device is in S6,S7,S8,S9 states from
USB point of view, the S interface may be in this
state, then it can be deactivated by a PDN
primitive (from host) or a hardware power down
which is generated by a suspend event on USB
bus
M3: INACTIVE Mode (initial mode if CFG1 = 1).
The line signal detection is enabled. Then it can
be activated (go to state ACTIVE) by a line signal
detection.
When USB is suspended, The S interface will
really be in the active mode once a resume
signalling has been done on USB bus after the
NLSD signal became active.
When USB is configured, a transition from this
mode to ACTIVE mode is obtained with a PUP
primitive (from host).
Figure 6 : S Interface States - CFG1=0
PON RESET /
USB REQUEST/
PIN RESET
M3
M2
STT(5)=0
STT(5)=1
PDN or PDWN=1
PUP or NLSD=0
STT(5)=1
M1 OFF
S LINE ACTIVATION
ACTIVE
INACTIVE S LINE ACTIVATION
POSSIBLE
NOT POSSIBLE


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