USB3500 datasheet(10/45 Pages) MICROCHIP

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USB3500

DS00002103A-page 10

 2005 - 2016 Microchip Technology Inc.

VDD1.8

N/A

1.8V regulator output for digital circuitry on chip. Place

a 4.7uF low ESR capacitor near this pin and connect

the capacitor from this pin to ground. Connect pin 49

to pin 27. See Section 5.6, "Internal Regulators and

POR," on page 22.

VSS

Ground

N/A

PHY ground.

Output,

Analog

N/A

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

should be floated.

Input,

Analog

N/A

Crystal pin. A 24MHz crystal is supported. The crystal

is placed across XI and XO. An external 24MHz clock

source may be driven into XI in place of a crystal.

VDDA1.8

N/A

1.8V regulator output for analog circuitry on chip.

Place a 0.1uF capacitor near this pin and connect the

capacitor from this pin to ground. In parallel, place a

4.7uF low ESR capacitor near this pin and connect the

capacitor from this pin to ground. See Section 5.6,

"Internal Regulators and POR".

VDD3.3

N/A

3.3V PHY Supply. Provides power for USB 2.0

Transceiver, UTMI+ Digital, Digital I/O, and

Regulators.

VDD3.3

N/A

3.3V PHY Supply. Should be connected directly to pin

54.

RBIAS

Analog,

CMOS

N/A

External 1% bias resistor. Requires a 12KΩ resistor to

ground.

GND FLAG

Ground

N/A

Ground. The flag must be connected to the ground

plane.

TABLE 2-1:

USB3500 PIN DEFINITIONS (CONTINUED)

Name

Direction,

Type

Active

Level

Description

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