USB2422 datasheet(8/47 Pages) MICROCHIP

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USB2422

DS00001726B-page 8

 2013 - 2015 Microchip Technology Inc.

DOWNSTREAM USB 2.0 INTERFACES

and

USBDP_DN[2:1]/

PRT_DIS_P[2:1]

and

USBDN_DN[2:1]/

PRT_DIS_M[2:1]

IO-U

Hi-Speed USB Data:

Connect to the downstream USB peripheral devices attached to the

hub’s ports.

Port Disable Strap Option:

If this strap is enabled by package and configuration settings (see

Table 4-1, "Hub Configuration Options"), 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

to disable the associated downstream port.

PRTPWR1/

O12

USB Power Enable:

Enables power to USB peripheral devices that are downstream, where

the hub supports active high power controllers only.

BC_EN1

IPD

Battery Charging Strap Option:

Port 1 pin will be sampled at RESET_N negation to determine if port 1

supports the battery charging protocol (and thus the supporting external

port power controllers) that would enable a device to draw the currents

per the USB Battery Charging Specification.

This pin has an internal pull-down that will be removed after the strap

option hold time is completed.

BC_EN1= 1: Battery charging feature is supported for port 1

BC_EN1= 0: Battery charging feature is not supported for port 1

PRTPWR2

O12

USB Power Enable:

Enables power to USB peripheral devices that are downstream, where

the hub supports active high power controllers only.

OCS1_N

OCS2_N

IPU

Over-Current Sense:

Input from external current monitor indicating an over-current condition.

This pin contains an internal pull-up to the 3.3 V supply.

RBIAS

I-R

USB Transceiver Bias:

A12.0 k

Ω (+/- 1%) resistor is attached from ground to this pin to set the

transceiver’s internal bias settings.

SERIAL PORT INTERFACE

SMBDATA

I/OSD12

System Management Bus Data

NON_REM1

Non-removable Port Strap Option:

This pin is sampled (in conjunction with SUSP_IND/NON_REM0) at

RESET_N negation to determine if ports [2:1] contain permanently

attached (non-removable) devices:

NON_REM[1:0] = 00: all ports are removable

NON_REM[1:0] = 01: port 1 is non-removable

NON_REM[1:0] = 10: ports 1 and 2 are non-removable

NON_REM[1:0] = 11: reserved

See Section 2.5, "Strap Pin Configuration" for details.

SMBCLK/

I/OSD12

System Management Bus Clock

CFG_SEL

Configuration Select:

The logic state of this multifunction pin is internally latched on the rising

edge of RESET_N (RESET_N negation), and will determine the hub

configuration method as described in Table 4-1.

TABLE 2-2:

USB2422 PIN DESCRIPTIONS (CONTINUED)

Pin #

Symbol

Buffer Type

Description

USB2422 数据表(PDF) 8 Page - Microchip Technology

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