USB3803 datasheet(86/99 Pages) MICROCHIP

tên linh kiện	USB3803

Giải thích chi tiết về linh kiện	USB 2.0 High-Speed Hub Controller Optimized

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USB3803

DS00001691B-page 86

 2014-2015 Microchip Technology Inc.

11.0

APPLICATION REFERENCE

11.1

Application Diagram

The USB3803 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

USB3803 as possible

CVDD33BYP

4.7

μF

Capacitor to ground for regulator stability.

Place as close to the

USB3803 as possible

COUT

0.1

μF

Bypass capacitor to ground.

Place as close to the

USB3803 as possible

RBIAS

12.0k

Series resistor to establish reference

voltage used by analog circuits.

Place as close to the

USB3803 as possible

RPU1

10k or 1k

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

400kHz operation. 1k for 1MHz opera-

tion.

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

Upstream

μF10μF

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