ISP1181B datasheet(21/70 Pages) PHILIPS

tên linh kiện	ISP1181B

Giải thích chi tiết về linh kiện	Full-speed Universal Serial Bus peripheral controller

PDF	70 Pages

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nhà sản xuất	PHILIPS [NXP Semiconductors]

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21 / 70 page

Philips Semiconductors

ISP1181B

Full-speed USB peripheral controller

Product data

Rev. 02 — 07 December 2004

21 of 70

9397 750 13958

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

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

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