USB2517I datasheet(10/58 Pages) MICROCHIP

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USB2517/USB2517I

DS00001598B-page 10

 2013-2016 Microchip Technology Inc.

5.0

PIN DESCRIPTIONS AND BUFFER TYPE DESCRIPTIONS

5.1

Pin Descriptions

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

their associated interface.

The “N” symbol in the signal name indicates that the active, or asserted, state occurs when the signal is at a low voltage

level. When “N” is not present before the signal name, the signal is asserted when at the high voltage level.

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

“active low” and “active high” signals. 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 inac-

tive.

TABLE 5-1:

USB2517/USB2517I PIN DESCRIPTIONS

Symbol

64 QFN

Buffer Type

Description

Upstream USB Interfaces

USBUP_DP

USBUP_DM

IO-U

USB Bus Data

These pins connect to the upstream USB bus data signals (Host

port, or upstream hub).

VBUS_DET

I/O12

Detect Upstream VBUS Power

Detects state of Upstream VBUS power. The MCHP Hub monitors

VBUS_DET to determine when to assert the internal D+ pull-up

resistor (signaling a connect event).

When designing a detachable hub, this pin must be connected to

the VBUS power pin of the USB port that is upstream from the hub.

For self-powered applications with a permanently attached host,

this pin must be connected to 3.3V or 5.0V (typically VDD33).

Downstream 7-Port USB 2.0 Interfaces

USBDN[7:1]_DP/

PRT_DIS_P[7:1]

USBDN[7:1]_DM/

PRT_DIS_M[7:1]

IO-U

Hi-Speed USB Data & Port Disable Strap Option

USBDN_DP[7:1] / USBDN_DM[7:1]: These pins connect to the

downstream USB peripheral devices attached to the hub’s port.

Downstream Port Disable Strap option:

PRT_DIS_P[7:1] / PRT_DIS_M[7:1]: If the strap is enabled by

package and configuration settings (see Table 5-2), this pin will be

sampled at RESET_N negation to determine if the port is disabled.

To disable, pull up with 10K resistor to 3.3V.

PRTPWR[7:1]

O12

USB Power Enable

Enables power to USB peripheral devices downstream.

Note:

The hub supports active high power controllers only!

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