ISP1123BD Просмотр технического описания (PDF) - Philips Electronics

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ISP1123BD

Universal Serial Bus compound hub

Philips Electronics 

Philips Semiconductors

ISP1123

USB compound hub

Table 2: Pin description for SO32 and SDIP32…continued

Symbol [1]

Pin Type Description

PSW5/GL5/ 18 O

GPSW [3]

mode 5: power switch control output for downstream port 5

(open-drain, 6 mA)

modes 3, 7: GoodLink LED indicator output for downstream

port 5 (open-drain, 6 mA); to connect an LED use a 330 Ω

series resistor

modes 0 to 2: gang mode power switch control output

(open-drain, 6 mA)

XTAL1

19 I

crystal oscillator input (6 MHz)

XTAL2

20 O

crystal oscillator output (6 MHz)

RESET [2]

21 I

reset input (Schmitt trigger); a LOW level produces an

asynchronous reset; connect to VCC for power-on reset

(internal POR circuit)

OPTION/SCL 22

I/O mode selection input; also functions as I2C-bus clock output

(open-drain, 6 mA)

INDV/SDA

23 I/O selects individual (HIGH) or global (LOW) power switching

and overcurrent detection; also functions as bidirectional

I2C-bus data line (open-drain, 6 mA)

DM5

24 AI/O downstream port 5 D− connection (analog) [4]

DP5

25 AI/O downstream port 5 D+ connection (analog) [4]

DM1

26 AI/O downstream port 1 D− connection (analog) [6]

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 06325

Preliminary specification

Rev. 01 — 5 October 1999

© Philips Electronics N.V. 1999. All rights reserved.

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