ISP1122 Просмотр технического описания (PDF) - Philips Electronics

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ISP1122

Universal Serial Bus stand-alone hub

Philips Electronics 

Philips Semiconductors

ISP1122

USB stand-alone hub

Table 2: Pin description for SO32 and SDIP32…continued

Symbol [1]

Pin Type Description

DP1

27 AI/O downstream port 1 D+ connection (analog) [6]

DM0

28 AI/O upstream port D− connection (analog)

DP0

29 AI/O upstream port D+ connection (analog)

DM2

30 AI/O downstream port 2 D− connection (analog) [6]

DP2

31 AI/O downstream port 2 D+ connection (analog) [6]

PSW1/GL1 [3] 32 O

modes 4 to 6: power switch control output for downstream

port 1 (open-drain, 6 mA)

modes 0 to 3, 7: GoodLink LED indicator output for

downstream port 1 (open-drain, 6 mA); to connect an LED

use a 330 Ω series resistor

[1] Symbol names with an overscore (e.g. NAME) indicate active LOW signals.

[2] The voltage at pin Vreg(3.3) is gated by the RESET pin. This allows fully self-powered operation by

connecting RESET to VBUS (+5 V USB supply). If VBUS is lost upstream port D+ will not be driven.

[3] See Table 4 “Mode selection”.

[4] To disable a downstream port connect both D+ and D− to VCC via a 1 MΩ resistor; unused ports must

be disabled in reverse order starting from port 5.

[5] Analog detection circuit can be switched off using an external EEPROM, see Table 23; in this case,

the pin functions as a logic input (TTL level).

[6] Downstream ports 1 and 2 cannot be disabled.

9397 750 07002

Product specification

Rev. 03 — 29 March 2000

© Philips Electronics N.V. 2000. All rights reserved.

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