USB2642 datasheet(9/56 Pages) MICROCHIP

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DS00001578C-page 9

USB2642

5.0

PIN DESCRIPTIONS

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

their associated interface. The pin descriptions below are applied when using the internal default firmware and can be

referenced in Section 7.0, Configuration Options. The acronyms used in this chapter can be referenced in Appendix A:

"Acronyms".

An N at the end of a signal name indicates that the active (asserted) state occurs when the signal is at a low voltage

level. When the N is not present, the signal is asserted when it is at a high voltage level. The terms assertion and nega-

tion are used exclusively in order 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 inactive.

5.1

USB2642 Pin Description

TABLE 5-1:

USB2642 PIN DESCRIPTIONS

Symbol

48-Pin

QFN

Buffer

Type

Description

Secure Digital Interface

SD_D[7:0]

I/O12PU

Secure Digital Data 7-0

These are the bi-directional data signals SD_D0 - SD_D7

Note:

The pull up resistance is a current source that is limited to VDD.

SD_CLK

O12

Secure Digital Clock

This is an output clock signal to 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.

SD_nCD

I/O12PU

Secure Digital Card Detect

SD_WP

I/O12

Secure Digital Write Protect

I2C Interface

SDA

I/O12

Serial Data Signal

SCL

I/O12

Serial Clock

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.

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.

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