USB82642 datasheet(9/64 Pages) MICROCHIP

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DS60001253F-page 9

USB82642

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 Chapter 7.0, Configuration Options on page 19. The acronyms used in this chapter can be referenced in

Appendix B:, "Acronyms," on page 59.

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

USB82642 Pin Description

TABLE 5-1:

USB82642 PIN DESCRIPTIONS

Symbol

48-Pin

VQFN

Buffer

Type

Description

If Pins not Used

Connection

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.

Leave open

SD_CLK

O12

Secure Digital Clock

This is an output clock signal to SD/MMC

device.

Leave open

SD_CMD

I/O12PU

Secure Digital Command

This is a bi-directional signal that connects to

the CMD signal of the SD/MMC device. The bi-

directional signal has a weak internal pull-up

resistor.

Leave open

SD_nCD

I/O12PU

Secure Digital Card Detect GPIO

This is a GPIO designated by the default firm-

ware as the Secure Digital card detection pin

and has a default internal pull-up.

Leave open

SD_WP

I/O12

Secure Digital Write Protected GPIO

This is a GPIO designated by the default firm-

ware as the Secure Digital card mechanical

write protect pin.

Leave open

I2C Interface

SDA

I/O12

Serial Data Signal

Leave open

SCL

I/O12

Serial Clock

Leave open

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