USB3503 datasheet(10/73 Pages) MICROCHIP

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USB3503

DS00001584B-page 10

 2011-2015 Microchip Technology Inc.

3.3

Pin Descriptions

This section provides a detailed description of each signal. The signals are arranged in functional groups according to

their associated interface.

The terms assertion and negation are used. This is done to avoid confusion when working with a mixture of “active low”

and “active high” signal. The term “assert”, or “assertion” indicates that a signal is active, independent of whether that

level is represented by a high or low voltage. The term “negate”, or “negation” indicates that a signal is inactive.

3.3.1

PIN DEFINITION

TABLE 3-1:

PIN DESCRIPTIONS

Name

Symbol

Type

Description

UPSTREAM HIGH SPEED INTER-CHIP INTERFACE

HSIC Clock/Strobe

STROBE

I/O

HSIC Upstream Hub Strobe pin

HSIC Data

DATA

I/O

HSIC Upstream Hub Data pin

High-Speed USB Data

Port Disable Strap Option

USBDN_DP[2:1]

USBDN_DM[2:1]

A-I/O

These pins connect to the downstream USB

peripheral devices attached to the hub’s ports

Downstream Port Disable Strap option:

This pin will be sampled at RESET_N negation to

determine if the port is disabled.

Both USB data pins for the corresponding port

must be tied to VDD33_BYP to disable the

associated downstream port.

HS USB Data

USBDN_DP[3]

USBDN_DM[3]

A-I/O

These pins connect to the downstream USB

peripheral devices attached to the hub’s ports.

There is no downstream Port Disable Strap

option on these ports.

SERIAL PORT INTERFACE

Serial Data

SDA

I/OD

I2C Serial Data

Serial Clock

SCL

Serial Clock (SCL)

Interrupt

INT_N

Interrupt

The function of this pin is determined by the

setting in the CFGP.INTSUSP configuration

When CFGP.INTSUSP = 0 (General Interrupt)

A transition from high to low identifies when one of

the interrupt enabled status registers has been

updated.

SOC must update the Serial Port Interrupt Status

When CFGP.INTSUSP = 1 (Suspend Interrupt)

Indicates USB state of the hub.

‘Asserted’ low = Unconfigured or configured and in

USB Suspend

‘Negated’ high = Hub is configured, and is active

(i.e., not in suspend)

If unused, this pin must be tied to VDD33_BYP.

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