參數(shù)資料
型號: ISP1301
廠商: NXP Semiconductors N.V.
英文描述: Universal Serial Bus On-The-Go transceiver
中文描述: 通用串行總線在- The - Go的收發(fā)器
文件頁數(shù): 24/46頁
文件大?。?/td> 245K
代理商: ISP1301
Philips Semiconductors
ISP1301
USB OTG transceiver
Product data
Rev. 01 — 14 April 2004
24 of 46
9397 750 11355
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
12. Clock wake up scheme
This section explains the ISP1301 clock stop timing, events triggering the clock to
wake up, and the timing of the clock wake up.
12.1 Power down event
The clock is stopped when the GLOBAL_PWR_DN bit is set. It takes approximately
8 ms for the clock to stop from the time the power down condition is detected. The
clock always stops at its falling edge. The waveform is given in
Figure 6
.
12.2 Clock wake up events
The clock wakes up when any of the following events occur on the ISP1301 pins:
SCL goes LOW
V
BUS
goes above the session valid threshold (0.8 V to 2.0 V), provided the
SESS_VLD bit in the Interrupt Enable High register is set.
ID changes when mini-A plug is inserted, provided the ID_FLOAT bit in the
Interrupt Enable Low register is set.
ID changes when mini-A plug is removed, provided the ID_FLOAT bit in the
Interrupt Enable High register is set.
DP goes HIGH, provided the DP_HI bit in the Interrupt Enable High register is set.
DM goes HIGH, provided the DM_HI bit in the Interrupt Enable High register is set.
The event triggers the clock to start and a stable clock is guaranteed after about six
clock periods, which is approximately 8
μ
s. The startup analog clock time is 10
μ
s.
Therefore, the total estimated start time after a triggered event is about 20
μ
s. The
clock will always start at its rising edge.
Waveforms of the clock wake up because of different events are given in
Figure 7
,
Figure 8
,
Figure 9
,
Figure 10
and
Figure 11
.
Fig 6.
Clock stopped using the GLOBAL_PWR_DN bit.
004aaa217
SCL
GLOBAL_PWR_DN
CLOCK
8 ms
Fig 7.
Clock wake up using SCL.
004aaa218
SCL
CLOCK
20
μ
s
相關(guān)PDF資料
PDF描述
ISP1301BS Universal Serial Bus On-The-Go transceiver
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ISP1362BD Single-chip Universal Serial Bus On-The-Go controller
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