MICROCHIP EVB-USB2422 Evaluation Board User Guide

: June 13, 2024
: MICROCHIP

Table of Contents

MICROCHIP EVB-USB2422 Evaluation Board
EVB-USB2422 Evaluation Board User’s Guide
INTRODUCTION
WARRANTY REGISTRATION
CUSTOMER SUPPORT
Overview
FEATURES
Hardware Configuration
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Download This Manual (PDF format)

MICROCHIP EVB-USB2422 Evaluation Board

MICROCHI-PEVB-USB2422-Evaluation-Board-product

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All Rights Reserved.
ISBN: 978-1-6683-3049-4

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EVB-USB2422 Evaluation Board User’s Guide

Preface

NOTICE TO CUSTOMERS
All documentation becomes dated, and this manual is no exception. Microchip tools and documentation are constantly evolving to meet customer needs, so some actual dialogs and/or tool descriptions may differ from those in this document. Please refer to our website (www.microchip.com) to obtain the latest documentation available. Documents are identified with a “DS” number. This number is located on the bottom of each page, in front of the page number. The numbering convention for the DS number i“DXA”, where “XXXXX” is the document number and “A” is the revision level of the document.
For the most up-to-date information on development tools, see the MPLAB® IDE online help. Select the Help menu, and then Topics to open a list of available online help files.

INTRODUCTION

This chapter contains general information that will be useful to know before using the EVB-USB2422 Evaluation Board User’s Guide. Items discussed in this chapter:

Document Layout
Conventions Used in this Guide
Warranty Registration
The Microchip Web Site
Development Systems Customer Change Notification Service
Customer Support
Document Revision History

DOCUMENT LAYOUT
The manual layout is as follows:

Chapter 1. “EVB-USB2422 Board Overview” – This shows a brief description of the EVB-USB2422 Evaluation Board.
Chapter 2. “Hardware Configuration” – This shows information of the board hardware and its configuration.

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description	Represents	Examples

Save__
Bold characters| A dialog button| Click OK
A tab| Click the Power tab
N‘Rnnnn| A number in verilog format, where N is the total number of digits, R is the radix and n is a digit.| 4‘b0010, 2‘hF1
Text in angle brackets < >| A key on the keyboard| Press ,
Courier New font:
Plain Courier New| Sample source code| #define START
Filenames| autoexec.bat
File paths| c:\mcc18\h
Keywords| _asm, _endasm, static
Command-line options| -Opa+, -Opa-
Bit values| 0, 1
Constants| 0xFF, ‘A’
Italic Courier New| A variable argument| file.o, where file can be any valid filename
Square brackets [ ]| Optional arguments| mcc18 [options] file [options]
Curly brackets and pipe character: { | }| Choice of mutually exclusive arguments; an OR selection| errorlevel {0|1}
Ellipses…| Replaces repeated text| var_name [ var_name ]
Represents code supplied by user| void main void

{

}

WARRANTY REGISTRATION

Please complete the enclosed Warranty Registration Card and mail it promptly. Sending the Warranty Registration Card entitles users to receive new product updates. Interim software releases are available at the Microchip web site.

THE MICROCHIP WEBSITE
Microchip provides online support via our website at www.microchip.com. This website is used as a means to make files and information easily available to customers. Accessible by using your favorite Internet browser, the website contains the following information:

Product Support – Datasheets and errata, application notes and sample programs, design resources, user’s guides, and hardware support documents, latest software releases and archived software
General Technical Support – Frequently Asked Questions (FAQs), technical support requests, online discussion groups, Microchip consultant program member listing
Business of Microchip – Product selector and ordering guides, latest Microchip press releases, a listing of seminars and events, listings of Microchip sales offices, distributors and factory representatives

DEVELOPMENT SYSTEMS CUSTOMER CHANGE NOTIFICATION SERVICE

Microchip’s customer notification service helps keep customers current on Microchip products. Subscribers will receive e-mail notification whenever there are changes, updates, revisions or errata related to a specified product family or development tool of interest.
To register, access the Microchip website at www.microchip.com, click on Customer Change the Notification and follow the registration instructions.The Development Systems product group categories are:

Compilers – The latest information on Microchip C compilers, assemblers, linkers, and other language tools. These include all MPLAB C compilers; all MPLAB assemblers (including MPASM assembler); all MPLAB linkers (including MPLINK object linker); and all MPLAB librarians (including MPLIB object librarian).
Emulators – The latest information on Microchip in-circuit emulators. This includes the MPLAB REAL ICE and MPLAB ICE 2000 in-circuit emulators.
In-Circuit Debuggers – The latest information on the Microchip in-circuit debuggers. This includes MPLAB ICD 3 in-circuit debuggers and PICkit 3 debug express.
MPLAB IDE – The latest information on Microchip MPLAB IDE, the Windows Integrated Development Environment for development systems tools. This list is focused on the MPLAB IDE, MPLAB IDE Project Manager, MPLAB Editor andMPLAB SIM simulator, as well as general editing and debugging features.
Programmers – The latest information on Microchip programmers. These include production programmers such as MPLAB REAL ICE in-circuit emulator, MPLAB ICD 3 in-circuit debugger, and MPLAB PM3 device programmers. Also included are nonproduction development programmers such as PICSTART Plus andPIC-kit 2 and 3.

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

Distributor or Representative
Local Sales Office
Field Application Engineer (FAE)
Technical Support
Customers should contact their distributor, representative or field application engineer (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document.
Technical support is available through the website at: http://www.microchip.com/support.

DOCUMENT REVISION HISTORY

Revisions	Section/Figure/Entry	Correction
DS50003564A (08-30-23)	Initial release

Overview

Chapter 1. EVB-USB2422 Board Overview

INTRODUCTION
The USB2422 is a low-power, full-featured, configurable, Hi-Speed USB 2.0-compliant hub with two downstream ports. Each of the downstream ports in the USB2422 device is capable of supporting battery charging. The EVB-USB2422 Evaluation Board demonstrates a standalone application for the hub with all the features listed in the following section and demonstrates advanced power- saving options and configurable port assignments.

FEATURES

24-pin QFN RoHS-compliant package
Two USB 2.0 downstream hub ports with individual port power and overcurrent sense (OCS)
Hi-Speed (480 Mbps), Full-Speed (12 Mbps), and Low-Speed (1.5 Mbps) compatible
USB battery charging
Supports Single-TT configuration for Full-Speed and Low-Speed connections (when connected to a Hi-Speed host)
Supports an internal default hub configuration or configuration from an external SMBus
Low-cost four-layer space-saving design with two outer signal layers and two inner ground layers
Individual port power control with LEDs for port power indication
Self-powered operation
Operates from a single voltage (5.0 VDC, regulated) external power supply
Single onboard 3.3 VDC regulator
Yellow LED indicator for Suspend hub state (optional)
EMI component footprints provided (optional)
Onboard 24 MHz crystal and ceramic resonator driver
Schematics, layout, and bill of materials are available to minimize new product development time

GENERAL DESCRIPTION

The EVB-USB2422 is an evaluation and demonstration platform featuring the USB2422 Ultra Fast USB 2.0 Hub on a four-layer RoHS-compliant printed circuit board. The EVB-USB2422 is designed to demonstrate the unique features of this device using a low-cost PCB implementation with individual port power control for the downstream USB 2.0 ports. The downstream USB 2.0 ports include a high- current port power controller, U2, to fully support USB battery charging as a high-current wake-up port. The EVB-USB2422 is designed to support internal default configuration settings as well as an external SMBus interface (optional) for custom-configured functionality. The external SMBus header, J7, is provided for configuration. Figure 2-1 and Figure 2-2 show the top-level and bottom-level silkscreen and copper layers.

FIGURE 1-1: EVB-USB2422 EVALUATION BOARD

Hardware Configuration

HARDWARE DESCRIPTION
The EVB-USB2422 has one onboard regulator that generates 3.3 VDC from an external 5 VDC regulated power supply. There is also an option to supply power externally through the J1 external 5 VDC power header (not populated by default). The USB2422 generates its own 1.2 VDC for internal use with on-chip 1.2 VDC regulators. The internal VDC regulator to the oscillator and the PLL is turned off during Suspend mode to minimize suspend current. The USB2422 consumes power from the 3.3 VDC supply.The downstream port power is distributed by one high-current port power switch, U2, that consumes power from the 5 VDC supply. All upstream and downstream port connectors have USB 2.0-compliant decoupling and a separate shield ground.

Port Assignment
Downstream ports are numbered 1 and 2 with one two-channel port power controller that individually supplies power to each downstream port. Overcurrent sensing is also monitored individually on each downstream port. Downstream port 1 is tied to the USB 2.0 connector, J8, and downstream port 2 is tied to the USB 2.0 connector, J6. The USB2422 allows any or all of the downstream ports to be configured for high-current battery USB charging, as demonstrated by the EVB-USB2422.

USB2422 Configuration
Default: The EVB-USB2422 is set up to support an internal default configuration as determined by the state of the CFG_SEL0 pin immediately after Reset. The vendor ID, product ID, language ID, device ID, and other options are set using ROM code defaults. In normal operation, SMBus is disabled by switching the SMBus Config switch, SW1, into the Default position. By switching SW1 into the Internal Defaults mode, SM_CLK/CFG_SEL0 and SM_DAT/NON_REM1 are pulled low to GND through the 10 kΩ resistors, R16 and R12, respectively. Additionally, the Config LED D2 will display green to indicate it is operating with internal defaults. SMBus Option: The EVB-USB2422 can load configuration from an external SMBus interface through the onboard header, J7. To enable SMBus, SW1 must be switched to the SMBus position instead of Default. This sets the SMBus address to 0101100b. By switching SW1 into SMBus mode, the SM_CLK/CFG_SEL0 and SM_DAT/NON_REM1 signals are pulled high to 3.3 V through the 10 kΩ resistors, R16 and R12, respectively. Additionally, the Config LED D2 will display red to indicate it is operating in SMB mode.
Once configured in the SMBus mode, battery charging may optionally be enabled on any of the downstream ports. The register memory map location 0xD0 is dedicated for Battery Charging support. Bit 1 enables battery charging for downstream port 1 and bit 2 enables battery charging for downstream port 2. Each port that has been enabled for battery charging will assert its corresponding PRTPWR pin. When the ports are configured for battery charging, the corresponding PRTPWR pin will be controlled by battery charging logic instead of the normal hub logic. PRTPWR will assert after initial hub configuration and will remain asserted and under the control of battery charging logic until one of two events occur:

An overcurrent is detected on the corresponding OCS_n pin. In this case, PRTPWR will dessert, and the only way to re-enable the PRTPWR is to reset the part.
The hub is connected on its upstream port and is enumerated by a USB host. In this case, control over PRTPWR reverts to the hub logic inside the part and the normal USB behavior applies, that is, the host must enable PRTPWR.

Powered State LED
An optional orange LED (D5) indicates when +3.3 VDC power is present.
Activity LED
An optional yellow LED (D4) indicates when the USB2422 is in suspension.
Port Power LEDs
The green LEDs, D1 and D3, indicate when port power is available to the associated downstream USB port. D1 represents port 2 power, and D3 represents port 1 power.
Connector Description
The EVB-USB2422 has a set of standard USB-style connectors, one of type B for the upstream port and two of type A for the downstream ports. Power is supplied via a 2.1 mm power jack. Table 2-1 lists all of the connectors on the EVB. For more details on the pinout of these connectors, see the USB2422 schematics on the CD-ROM.

CONNECTOR DESCRIPTION

Connector	Type	Description
J1	2×1	External +5 VDC
J2	Power Jack 2.1 mm	+5 VDC Power Supply
J3	2×1	External Reset
J6	USB A	Downstream USB Port 2
J7	2×5	SMBus Interface
J8	USB A	Downstream USB Port 1
J9	USB B	Upstream USB Port 0

Layout Considerations
The EVB-USB2422 is designed on four PCB layers, with two signal layers and two supply layers. The PCB layer stack-up is shown in Table 2-2. All signals are routed on thetop and bottom layers. Internal layers are ground. Note that the differential signals from the USB2422 match the upstream and downstream port placement simplifying routing of critical signals. The total board thickness is 62 mil (±7 mil).

TABLE 2-2: PCB LAYER STACK

Component Side|
---|---
Solder mask|
Layer 1| 0.5 oz. base, ~1 oz. finished
Pre-preg| 1×1080 and 1×106 370HR (~4-4.6 mil)
Layer 2—GND| 1 oz. base Cu
Core| ~45 mil 370 HR
Layer 3—GND| 1 oz. base Cu
Pre-preg| 1×1080 and 1×106 370HR (~4-4.6 mil)
Layer 4| 0.5 oz. base, ~1 oz. finished
Solder mask|

The component side top layer is shown in Figure 2-1 with silkscreen information to identify component locations.

FIGURE 2-1: EVB-USB2422 TOP LAYER—COMPONENT SIDE MICROCHI-PEVB-USB2422
-Evaluation-Board-FIG-2