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ISP1181B Datasheet(PDF) 21 Page - NXP Semiconductors

Part # ISP1181B
Description  Full-speed Universal Serial Bus peripheral controller
PDF  70 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

ISP1181B Datasheet(HTML) 21 Page - NXP Semiconductors

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Philips Semiconductors
ISP1181B
Full-speed USB peripheral controller
Product data
Rev. 02 — 07 December 2004
21 of 70
9397 750 13958
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
In Figure 6:
• A: indicates the point at which the USB bus enters the idle state.
• B: indicates resume condition, which can be a 20 ms K-state on the USB bus, a
HIGH level on pin WAKEUP, or a LOW level on pin CS.
• C: indicates remote wake-up. The ISP1181B will drive a K-state on the USB bus
for 10 ms after pin WAKEUP goes HIGH or pin CS goes LOW.
• D: after detecting the suspend interrupt, set and clear bit GOSUSP in the Mode
register.
11.1.1
Powered-off application
Figure 7 shows a typical bus-powered modem application using the ISP1181B. The
SUSPEND output switches off power to the microcontroller and other external circuits
during the suspend state. The ISP1181B is woken up through the USB bus (global
resume) or by the ring detection circuit on the telephone line.
Fig 6.
Suspend and resume timing.
004aaa359
INT_N
> 5 ms
suspend
interrupt
USB BUS
GOSUSP
WAKEUP
SUSPEND
idle state
10 ms
K-state
> 3 ms
1.8 ms to 2.2 ms
0.5 ms to 3.5 ms
resume
interrupt
A
C
D
B



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