USB3370 datasheet(7/75 Pages) MICROCHIP

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DS00001915B-page 7

USB3370

DATA[3]

I/O,

CMOS

N/A

ULPI bi-directional data bus.

DATA[4]

I/O,

CMOS

N/A

ULPI bi-directional data bus.

EXTVBUS

Input, CMOS

High

External Vbus Detect. Connect to fault output of an

external USB power switch or an external Vbus Valid

comparator. See Section 5.7.5, "External Vbus

Indicator," on page 29 for details. This pin has a pull

down resistor to prevent it from floating when the ULPI

bit UseExternalVbusIndicator is set to 0.

DATA[5]

I/O,

CMOS

N/A

ULPI bi-directional data bus.

DATA[6]

I/O,

CMOS

N/A

ULPI bi-directional data bus.

N/A

No connect. Leave pin floating.

DATA[7]

I/O,

CMOS

N/A

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

CPEN_N

Output,

Open Drain

Low

External 5 volt supply enable. This pin is used to

enable the external Vbus power supply. The CPEN_N

pin is tri-stated on POR.

5DP

I/O,

Analog

N/A

D+ pin of the USB cable.

4DM

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 USB3370.

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.

7ID

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 10kΩ (±1%)

resistor to ground, placed as close as possible to the

USB3370. Nominal voltage during ULPI operation is

0.8V.

Output,

Analog

N/A

Crystal pin. If using an external clock on XI this pin

should be floated.

REFCLK

Input,

CMOS

N/A

ULPI Clock Out Mode:

Reference clock or XI (crystal in) pin.

ULPI Clock In Mode:

60MHz ULPI clock input.

TABLE 2-1:

USB3370 PIN DESCRIPTIONS (CONTINUED)

Name

Direction/

Type

Active

Level

Description

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