Microchip USB3320 Handleiding

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INTRODUCTION

For customers who want to integrate the USB3320 and are looking to the USB3340/USB83340 for future products, this

document describes the hardware and software considerations required to accomplish that migration with the least

impact to customer design resources. By following the design guidelines outlined in this document, a designer can use

a common PCB and software platform that can be used for both the USB3320 and USB3340/USB83340 with nothing

more than a change to the Bill of Materials (BOM) being required.

REFERENCES

Microchip USB Transceiver Data Sheets:

• USB3320

• USB334x

• USB83340

DESIGNING A COMMON PCB FOR THE USB3320 AND USB3340/USB83340

A common PCB design can be engineered to support both the USB3320 and USB3340/USB83340 transceivers.

Observing a few simple design considerations will provide a seamless transition from USB3320 to USB3340/

USB83340. Unless otherwise specified within this document, all PCB layout design guidelines that apply to the

USB3320 shall apply to the USB3340/USB83340.

To design a common hardware platform for both USB transceivers, there are three design changes that must be made:

•Depopulate or disable the 1.8V regulator input.

•Change the capacitor on the VDD18 pin from a 0.1



F to a 1.0



F low-ESR capacitor.

•VBAT min voltage raised from 3.1V to 4.0V for the USB83340 only. (USB3340 VBAT min voltage lowered to 3.0V).

Other optional changes that can be made:

•Change the capacitor on the VDD33 pin from a 2.2



F low-ESR to a 1.0



F low-ESR Capacitor.

•Change the resister on the RVBUS pin from a 10k to 20kresistor.

Integrating the 1.8V Regulator

The USB3340/USB83340 integrates the 1.8V regulator that was external to the USB3320. The VDD18 pin of the

USB3320 is an input and requires an external voltage source to be applied to the pin. Conversely, the VDD18 pin of the

USB3340/USB83340 is an output that must never be presented with an externally sourced voltage.

AN 19.0

Migrating USB Designs from the USB3320 to the

USB3340/USB83340

Product specificaties