USB3280 datasheet(9/44 Pages) MICROCHIP

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 2004 - 2015 Microchip Technology Inc.

DS00001898A-page 9

USB3280

TABLE 4-5:

POWER AND GROUND SIGNALS

Name

Direction

Active

Level

Description

VDD3.3

(V33)

N/A

3.3V Supply.

Provides power for USB 2.0 Transceiver, UTMI+

Digital, Digital I/O, and Regulators.

REG_EN

(REN)

Input

High

On-Chip 1.8V regulator enable.

Connect to ground to disable

both of the on chip (VDDA1.8 and VDD1.8) regulators. When

regulators are disabled:

• External 1.8V must be supplied to VDDA1.8 and VDD1.8 pins.

When the regulators are disabled, VDDA1.8 may be con-

nected to VDD1.8 and a bypass capacitor (0.1

μF recom-

mended) should be connected to each pin.

• The voltage at VDD3.3 must be at least 2.64V (0.8 * 3.3V)

before voltage is applied to VDDA1.8 and VDD1.8.

VDD1.8

(V18)

N/A

1.8V Digital Supply.

Supplied by On-Chip Regulator when

REG_EN is active. Low ESR 4.7uF minimum capacitor

requirement when using internal regulators. Do not connect

VDD1.8 to VDDA1.8 when using internal regulators. When the

regulators are disabled, VDD1.8 may be connected to VDD1.8A.

VSS

(GND)

N/A

Common Ground.

VDDA1.8

(V18A)

N/A

1.8V Analog Supply.

Supplied by On-Chip Regulator when

REG_EN is active. Low ESR 4.7uF minimum capacitor

requirement when using internal regulators. Do not connect

VDD1.8A to VDD1.8 when using internal regulators. When the

regulators are disabled, VDD1.8A may be connected to VDD1.8.

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