USB333X datasheet(70/85 Pages) MICROCHIP

70 / 85 page

USB333x

DS00001880A-page 70

 2009 - 2015 Microchip Technology Inc.

8.0

APPLICATION NOTES

8.1

Application Diagram

The USB333x requires few external components as shown in the application diagrams. The USB 2.0 Specification

restricts the voltage at the VBUS pin to a maximum value of 5.25V. In some applications, the voltage will exceed this

limit, so the USB333x provides an integrated over voltage protection circuit. The over voltage protection circuit works

with an external resistor (RVBUS) to lower the voltage at the VBUS pin.

TABLE 8-1:

COMPONENT VALUES IN APPLICATION DIAGRAMS

Reference

Designator

Value

Description

Notes

COUT

See Table 4-12

Bypass capacitor to ground (<1

Ω ESR) for

regulator stability.

Place as close as possible to the

PHY.

CVBUS

See Table 8-2

Capacitor to ground required by the USB

Specification. Microchip recommends <1

ESR.

Place near the USB connector.

CBYP

System

dependent.

Bypass capacitor to ground. Typical

values used are 0.1 or 0.01

μF.

Place as close as possible to the

PHY.

RVBUS

Ω or 20kΩ

Series resistor to work with internal over

voltage protection.

See Section 5.6.2.6 for information

regarding power dissipation.

RBIAS

8.06k

Ω (±1%)

Series resistor to establish reference

voltage.

See Section 5.3 for information

regarding power dissipation.

TABLE 8-2:

CAPACITANCE VALUES AT VBUS OF USB CONNECTOR

Mode

MIN Value

MAX Value

Host

120

μF

Device

μF10μF

OTG

μF6.5μF

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