USB82642 datasheet(10/64 Pages) MICROCHIP

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USB82642

DS60001253F-page 10

 2012-2021 Microchip Technology Inc.

USB Interface

USBUP_DM

USBUP_DP

I/O-U

USB Bus Data

These pins connect to the upstream USB bus

data signals (host port or upstream hub).

USBUP_DM and USBUP_DP can be swapped

using the PortSwap feature.

Leave open

USBDN_DM

[3:2]

USBDN_DP

[3:2]

I/O-U

USB Bus Data

These pins connect to the downstream USB bus

data signals and can be swapped using the

PortSwap feature.

Leave open

PRTCTL[3:2]

I/OD12PU

USB Power Enable

As an output, these pins enables power down-

stream USB peripheral devices. See Section

5.3, "Port Power Control" for diagram and usage

instructions.

As an input, when the power is enabled, these

pins monitor the over-current condition. When

an over-current condition is detected, these pins

turn the power off.

Leave open

VBUS_DET

Detect Upstream VBUS Power

The Microchip hub monitors VBUS_DET to

determine when to assert the internal D+ pull-up

resistor (signaling a connect event).

When designing a detachable hub, connect this

pin to the VBUS power pin of the USB port that

is upstream of the hub.

For self-powered applications with a perma-

nently attached host, this pin should be pulled

up, typically to VDD33.

VBUS is a 3.3 volt input. A resistor divider must

be used when connecting to 5 volts of USB

power.

Pull up.

Note:

Pull down will

disable entire

USB82642 chip.

RBIAS

I-R

USB Transceiver Bias

A 12.0 kΩ,

±1.0% resistor is attached from VSS

to this pin in order to set the transceiver's inter-

nal bias currents.

N/A

XTAL1 (CLKIN)

ICLKx

24 MHz Crystal Input/External Clock Input

This pin can be connected to one terminal of the

crystal or it can be connected to an external

24 MHz clock when a crystal is not used.

N/A

XTAL2

OCLKx

24 MHz Crystal Output

This is the other terminal of the crystal, or a no

connect pin, when an external clock source is

used to drive XTAL1 (CLKIN).

N/A

Note:

Leave it open,

when an exter-

nal clock source

is used to drive

XTAL1 (CLKIN).

TABLE 5-1:

USB82642 PIN DESCRIPTIONS (CONTINUED)

Symbol

48-Pin

VQFN

Buffer

Type

Description

If Pins not Used

Connection

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