USB334X datasheet(11/92 Pages) MICROCHIP

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DS00002646A-page 11

USB334x

6DATA[2]

I/O,

CMOS

N/A

ULPI bi-directional data bus.

7DATA[3]

I/O,

CMOS

N/A

ULPI bi-directional data bus.

8DATA[4]

I/O,

CMOS

N/A

ULPI bi-directional data bus.

VDDIO

Power

N/A

ULPI interface supply voltage. When RESETB is low

and VDDIO is powered on, ULPI pins will tri-state.

DATA[5]

I/O,

CMOS

N/A

ULPI bi-directional data bus.

DATA[6]

I/O,

CMOS

N/A

ULPI bi-directional data bus.

DATA[7]

I/O,

CMOS

N/A

ULPI bi-directional data bus. DATA[7] is the MSB.

I/O,

Analog

N/A

D+ pin of the USB cable.

I/O,

Analog

N/A

D- pin of the USB cable.

VDD33

Power

N/A

3.3V Regulator Output. A 1.0uF (<1 ohm ESR)

bypass capacitor to ground is required for regulator

stability. The bypass capacitor should be placed as

close as possible to the USB334x.

VBAT

Power

N/A

Regulator input. The regulator supply can be from

5.5V to 3.0V.

VBUS

I/O,

Analog

N/A

This pin is used for the VBUS comparator inputs and

for VBUS pulsing during session request protocol.

An external resistor, RVBUS, is required between this

pin and the USB connector.

Input,

Analog

N/A

For device applications the ID pin is connected to

VDD33. For Host applications ID is grounded. For

OTG applications the ID pin is connected to the USB

connector.

RBIAS

Analog,

CMOS

N/A

Bias Resistor pin. This pin requires an 8.06kΩ (±1%)

resistor to ground, placed as close as possible to the

USB334x. Nominal voltage during ULPI operation is

0.8V.

Output,

CMOS

N/A

Crystal pin. If using an external clock on REFCLK /

XI, this pin should be floated.

REFCLK/XI

Input,

CMOS

N/A

ULPI Clock Out Mode:

Model-specific reference clock or XI (crystal in) pin.

See Product Identification System, Note 1.

ULPI Clock In Mode:

60MHz ULPI clock input.

TABLE 2-2:

USB3343 PIN DESCRIPTIONS (CONTINUED)

Name

Direction/

Type

Active

Level

Description

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