CS5535 datasheet(38/555 Pages) NSC

38 / 555 page

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Revision 0.8

Signal Definitions (Continued)

2.2.4

USB Interface

Signal Name

Ball No.

Type

Description

USB_PWR_EN1

P17

USB Power Enable 1. This signal is intended to be used to enable an

external USB power source for Port 1, such as the National LM3526.

USB_PWR_EN1 is an active high signal. If low, it indicates that the

external USB power source for Port 1 is turned off. Defaults off from

reset.

USB_PWR_EN2

N16

USB Power Enable 2. This signal is intended to be used to enable an

external USB power source for Port 2, such as the National LM3526.

USB_PWR_EN2 is an active high signal. If low, it indicates that the

external USB power source for Port 2 is turned off. Defaults off from

reset.

USB_OC_SENS#

N15

USB Over Current Sense. This signal is the logical OR or wired-OR

from all external USB power supply devices, such as the National

LM3526, and is shared by USB1 and USB2 (all four ports). When

pulled low it causes both USB_PWR_EN1 and USB_PWR_EN2 to

de-assert and generate an interrupt. Tie high if not used.

USB1_1_DATPOS

K16

I/O

USB Port 1_1 Data Positive. This is the positive differential side of

the USB data for port 1_1. (Note 1, Note 2.)

Note 1. Use external 27

Ω series resistor on output. From reset, these outputs are in TRI-STATE. At board level, a 15 kΩ

pull-down resistor is required per the USB specification.

Note 2. External clamping diodes may be needed to meet over voltage requirements.

USB1_1_DATNEG

K17

I/O

USB Port 1_1 Data Negative. This is the negative differential side of

the USB data for port 1_1. (Note 1, Note 2.)

USB1_2_DATPOS

L16

I/O

USB Port 1_2 Data Positive. This is the positive differential side of

the USB data for port 1_2. (Note 1, Note 2.)

USB1_2_DATNEG

L17

I/O

USB Port 1_2 Data Negative. This is the negative differential side of

the USB data for port 1_2. (Note 1, Note 2.)

USB2_1_DATPOS

H17

I/O

USB Port 2_1 Data Positive. This is the positive differential side of

the USB data for port 2_1. (Note 1, Note 2.)

USB2_1_DATNEG

H16

I/O

USB Port 2_1 Data Negative. This is the negative differential side of

the USB data for port 2_1. (Note 1, Note 2.)

USB2_2_DATPOS

G17

I/O

USB Port 2_2 Data Positive. This is the positive differential side of

the USB data for port 2_2. (Note 1, Note 2.)

USB2_2_DATNEG

G16

I/O

USB Port 2_2 Data Negative. This is the negative differential side of

the USB data for port 2_2. (Note 1, Note 2.)

AVSS_USB

F16, J16,

M16

AGND

USB Analog Circuit Ground. Total of three ground balls for the USB

transceivers. Most applications should connect this to signal ground.

AVDD_USB

F17, J17,

M17

APWR

USB Analog Circuit Power. Total of three power balls for the USB

transceivers. Most applications should connect this to VIO.

CS5535 数据表(PDF) 38 Page - National Semiconductor (TI)

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