USB82640 datasheet(11/64 Pages) MICROCHIP

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DS60001312A-page 11

USB82640

MS_D[7:0]

I/O12PD

MS System Data In/Out

These pins are the bi-directional data signals for

the MS device. In serial mode, the most signifi-

cant bit (MSB) of each byte is transmitted first

by either MSC or MS device on MS_D0.

MS_D0, MS_D2, and MS_D3 have weak pull-

down resistors. MS_D1 has a pull down resistor

if in parallel mode, otherwise it is disabled. In 4-

or 8-bit parallel modes, there is a weak pull-

down resistor on all MS_D7 - MS_D0 signals.

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 V input. A resistor divider must be

used when connecting to 5 V of USB power.

Pull up.

Note:

Pull down will

disable entire

USB82640 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

TABLE 5-1:

USB82640 PIN DESCRIPTIONS (CONTINUED)

Symbol

48-Pin

VQFN

Buffer

Type

Description

If Pins not Used

Connection

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