ISP1582 Просмотр технического описания (PDF) - Philips Electronics

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Компоненты Описание

производитель

ISP1582

Hi-Speed Universal Serial Bus peripheral controller

Philips Electronics 

Philips Semiconductors

8.14.2 Self-powered mode

ISP1582

Hi-Speed USB peripheral controller

9397 750 13699

Preliminary data

VCC

1.5 kΩ

RPU

VBUS

ISP1582

VCC(I/O)

+

−

004aaa460

VBUS

+

1 µF

−

USB

1 MΩ

Fig 14. Self-powered mode.

In self-powered mode, VCC and VCC(I/O) are supplied by the system. Bit SOFTCT in

the Mode register must be always logic 1. See Figure 14.

Table 9: Operation truth table for SoftConnect

ISP1582 operation

Power supply

Bit SOFTCT in

VCC

VCC(I/O) RPU VBUS Mode register

(3.3 V)

Normal bus operation

3.3 V 3.3 V 3.3 V 5 V enabled

No pull-up on DP

3.3 V 3.3 V 3.3 V 0 V[1] disabled

[1] When the USB cable is removed, SoftConnect is disabled.

Table 10: Operation truth table for clock off during suspend

ISP1582 operation

Power supply

VCC

VCC(I/O) RPU VBUS

(3.3 V)

Clock off

during

suspend

Clock will wake up:

3.3 V 3.3 V 3.3 V 5 V

enabled

After resume and

After a bus reset

Clock will wake up:

3.3 V 3.3 V 3.3 V 0 V => 5 V enabled

After detecting the presence of VBUS

Table 11: Operation truth table for back voltage compliance

ISP1582 operation

Power supply

VCC

VCC(I/O) RPU VBUS

(3.3 V)

Back voltage is not measured in this 3.3 V 3.3 V

mode

3.3 V 5 V

Back voltage is not an issue because 3.3 V

pull-up on DP will not be present when

VBUS is not present

3.3 V

3.3 V 0 V

Bit SOFTCT

in Mode

register

enabled

disabled

Rev. 03 — 25 August 2004

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

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