ISP1521 查看數據表（PDF） - Philips Electronics

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ISP1521

Hi-Speed Universal Serial Bus hub controller

Philips Electronics 

Philips Semiconductors

ISP1521

Hi-Speed USB hub controller

9397 750 13702

Product data

Table 2: Pin description[1]…continued

Symbol[2]

Pin Type Description

OC4_N

32 AI/I overcurrent sense input for downstream facing port 4

(analog/digital)

PSW4_N

33 I/O output — power switch control output (open-drain) with an

internal pull-up resistor for downstream facing port 4

input — function of the pin when used as an input is given in

Table 5

OC3_N

34 AI/I overcurrent sense input for downstream facing port 3

(analog/digital)

PSW3_N

35 I/O output — power switch control output (open-drain) with an

internal pull-up resistor for downstream facing port 3

input — function of the pin when used as an input is given in

Table 5

OC7_N

36 AI/I overcurrent sense input for downstream facing port 7

(analog/digital)

PSW7_N

37 I/O output — power switch control output (open-drain) with an

internal pull-up resistor for downstream facing port 7

input — function of the pin when used as an input is given in

Table 5

OC2_N

38 AI/I overcurrent sense input for downstream facing port 2

(analog/digital)

PSW2_N

39 I/O output — power switch control output (open-drain) with an

internal pull-up resistor for downstream facing port 2

input — function of the pin when used as an input is given in

Table 5

RESET_N 40 I

asynchronous reset input; when reset is active, the internal

switch to the 1.5 kΩ external resistor is opened, and all pins

DPn and DMn are three-state; it is recommended that you

connect to VBUS through an RC circuit; refer to the schematics in

ISP1521 Hub Demo Board User’s Guide

ADOC

41 I

analog or digital overcurrent detect selection input; a LOW

selects digital mode and a HIGH (3.3 V or 5.0 V) selects analog

mode

XTAL1

42 I

crystal oscillator input (12 MHz)

XTAL2

43 O crystal oscillator output (12 MHz)

GND

44 -

ground supply

DM2

DP2

45 AI/O downstream facing port 2 D− connection (analog)[4]

46 AI/O downstream facing port 2 D+ connection (analog)[4]

GND

47 -

ground supply

DM7

DP7

48 AI/O downstream facing port 7 D− connection (analog)[3]

49 AI/O downstream facing port 7 D+ connection (analog)[3]

VCC1

GND

50 -

51 -

analog supply voltage 1 (3.3 V)

ground supply

VCC4

GND

52 -

53 -

crystal and PLL supply voltage 4 (3.3 V)

ground supply

DM3

54 AI/O downstream facing port 3 D− connection (analog)[3]

Rev. 03 — 24 November 2004

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

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