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ISP1181A

Full-speed Universal Serial Bus peripheral controller

Philips Electronics 

Philips Semiconductors

ISP1181A

Full-speed USB peripheral controller

USB BUS

INT_N

GOSUSP

WAKEUP

A

> 5 ms

idle state

C

10 ms

K-state

> 3 ms

suspend

interrupt

D

B

resume

interrupt

SUSPEND

Fig 6. Suspend and resume timing.

0.5 ms to 3.5 ms

1.8 ms to 2.2 ms

004aaa359

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 ISP1181A 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 ISP1181A. The

SUSPEND output switches off power to the microcontroller and other external circuits

during the suspend state. The ISP1181A is woken up through the USB bus (global

resume) or by the ring detection circuit on the telephone line.

9397 750 13959

Product data

Rev. 05 — 08 December 2004

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

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