USB3503 datasheet(58/73 Pages) MICROCHIP

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USB3503

DS00001584B-page 58

 2011-2015 Microchip Technology Inc.

11.0 APPLICATION REFERENCE

11.1

Application Diagram

The USB3503 requires several external components to function and insure compliance with the USB 2.0 specification.

TABLE 11-1:

COMPONENT VALUES IN APPLICATION DIAGRAMS

Reference

Designator

Value

Description

Notes

CVDD12BYP

1.0

μF

Capacitor to ground for regulator stability. Place as close to the

USB3503 as possible

CVDD33BYP

4.7

μF

Capacitor to ground for regulator stability. Place as close to the

USB3503 as possible

COUT

0.1

μF

Bypass capacitor to ground.

Place as close to the

USB3503 as possible

RBIAS

12.0k

Series resistor to establish reference

voltage used by analog circuits.

Place as close to the

USB3503 as possible

RPU1

10k or 1k

Pull-up for I2C bus. 10k for 100kHz or

400kHz operation. 1k for 1MHz operation.

RPU2

10k (or greater)

Pull-up for open-drain outputs

TABLE 11-2:

CAPACITANCE VALUES AT VBUS OF USB CONNECTOR

Port

MIN Value

MAX Value

Downstream

120

μF

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