USB2640 datasheet(15/60 Pages) MICROCHIP

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DS00001947C-page 15

USB2640/USB2641

SD_CLK

O12

Secure Digital Clock

This is an output clock signal to the SD/MMC device.

SD_CMD

I/O12PU

Secure Digital Command

This is a bi-directional signal that connects to the CMD signal of the

SD/MMC device and has an internal weak pull-up resistor.

SD_WP

I/O12

Secure Digital Write Protected

Designates as the Secure Digital card mechanical write protect detect

pin.

SD_nCD

I/O12

Secure Digital Card Detect

Designates as the Secure Digital card detection pin.

USB INTERFACE

USB-

USB+

I/O-U

USB Bus Data

These pins connect to the upstream USB bus data signals. USB+ and

USB- can be swapped using the PortSwap feature (See Section

7.3.5.20, "F1h: Port Swap," on page 38).

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 (See Section 7.3.5.20, "F1h:

Port Swap," on page 38).

PRTCTL[3:2]

I/OD12PU

USB Power Enable

As an output, these pins enable power to downstream USB peripheral

devices and have weak internal pull-up resistors. See Section 6.3,

"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, the pins

turn the power off.

VBUS_DET

Detect Upstream VBUS Power

Detects the state of upstream VBUS power. The 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 permanently attached host, this

pin should be pulled up, typically to VDD33.

VBUS is a 3.3 volt input. A resistor divider must be used if connecting

to 5 volts of USB power.

RBIAS

I-R

USB Transceiver Bias

A 12.0 k

 1.0% resistor is attached from VSS to this pin in order to

set the transceiver's internal bias currents.

XTAL1 (CLKIN)

ICLKx

24 MHz Crystal Input or External clock Input

This pin can be connected to one terminal of the crystal or it can be

connected to an external 24 MHz 1.8 V clock when a crystal is not

used.

TABLE 6-1:

USB2640/USB2641 PIN DESCRIPTIONS (CONTINUED)

Symbol

48-Pin

QFN

Buffer Type

(Table 6-2)

Description

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