isp1181b NXP Semiconductors, isp1181b Datasheet - Page 21

• Manufacturer Part Number: isp1181b
• Description: Isp1181b Full-speed Universal Serial Bus Peripheral Controller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 13958
Product data
Fig 6. Suspend and resume timing.
SUSPEND
USB BUS
WAKEUP
GOSUSP
INT_N
11.1.1 Powered-off application
In
Figure 7
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.
•
•
•
•
A
Figure
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.
interrupt
suspend
> 3 ms
shows a typical bus-powered modem application using the ISP1181B. The
6:
Rev. 02 — 07 December 2004
idle state
> 5 ms
1.8 ms to 2.2 ms
D
B
0.5 ms to 3.5 ms
interrupt
resume
Full-speed USB peripheral controller
C
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
K-state
10 ms
ISP1181B
004aaa359
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