I want to built a USB 2 hub using the USB2514B con...

collinsemasi

flux

I want to built a USB 2 hub using the USB2514B controller from microchip. I linked relevent documents in the Reference Document file. Generate a product requirements doc, a design spec for schematic capture, a component selection and BOM tracker, a design review template, a test and validation plan, and a DFM checklist for pre-production.
Thinking for 4 days 2 hrs...
Thinking...
No schematic yet

Talk to Flux to get started.

Refine this doc
Ask about this doc
Product Requirements Document
1. Purpose
Design a compact embedded 4-port USB 2.0 hub around the Microchip USB2514B controller for integration into a host system.
2. Product Scope
  • Provide 1 upstream USB 2.0 connection to a host
  • Provide 4 downstream USB 2.0 ports
  • Support low-speed, full-speed, and high-speed downstream devices
  • Use the USB2514B in the preferred 36-pin SQFN package for new designs
  • Support board-level configuration using default strap options, optional I2C EEPROM, or optional SMBus/MCU configuration
3. Functional Requirements
3.1 USB Hub Function
  • The design shall implement a USB 2.0 compliant 4-port hub using the USB2514B.
  • The hub shall support multi-transaction translation.
  • The hub shall support per-port enable/disable behavior.
  • Unused downstream ports shall be disabled by strap or configuration.
3.2 Power Architecture
  • The hub IC shall run from a single regulated 3.3 V rail.
  • The 3.3 V rail applied to VDD33 and VDDA33 shall remain within 3.0 V to 3.6 V.
  • The design shall provide downstream 5 V VBUS power appropriate to the selected connector and power model.
  • If battery charging is enabled on any downstream port, that port power path shall support 1.5 A on VBUS.
3.3 Clocking and Reset
  • The design shall use a 24.000 MHz reference source with ±350 ppm accuracy.
  • The design shall implement a deterministic RESET_N strategy so the hub is held in reset until supplies are valid.
  • The reset strategy shall account for the documented power-up glitch erratum.
3.4 Configuration
  • The baseline design shall boot in internal default configuration unless product requirements require EEPROM or SMBus customization.
  • If EEPROM configuration is used, the EEPROM shall be 256 x 8-bit and preprogrammed or programmed in-circuit before final assembly.
  • If SMBus configuration is used, the host MCU/SoC shall load only the register settings that differ from defaults.
3.5 Port Power Control and Protection
  • Each exposed downstream port shall include controlled VBUS power switching and over-current reporting.
  • Port power controllers shall be compatible with 3.3 V hub control signals, or external polarity/level adaptation shall be added.
  • USB ESD protection components shall be selected for high-speed USB use with total added parasitic budget consistent with the Microchip guideline of 5 pF per USB trace including connector, PCB trace, and protection effects.
3.6 Mechanical / Implementation
  • The PCB shall support controlled-impedance routing for USB high-speed differential pairs.
  • The board shall include a solid reference ground plane beneath USB differential pairs.
  • The exposed pad shall be tied to ground with multiple vias.
4. Product Variants / Open Decisions
  • Self-powered vs bus-powered hub
  • Type-A vs Type-C downstream connectors
  • Whether to enable battery charging on any or all ports
  • Whether downstream devices are removable or non-removable
  • Whether customization is via strapping only, EEPROM, or MCU/SMBus
5. Compliance / Quality Targets
  • USB 2.0 functional compliance
  • Use USB-IF compliant connectors with assigned TID if formal compliance is required
  • Design documentation shall include schematic review, layout review, validation test plan, and DFM checklist
6. Out of Scope for First Revision
  • USB 3.x support
  • Integrated USB-PD negotiation
  • Embedded upstream MCU firmware beyond optional SMBus configuration
7. Acceptance Criteria
  • Enumerates reliably with a host over upstream USB
  • Detects and operates all enabled downstream ports
  • Passes reset, power-cycle, and reconnect testing
  • Meets intended power-mode behavior (self-powered or bus-powered)
  • Meets downstream VBUS delivery and over-current protection requirements
  • Matches schematic, review, validation, and DFM documents in this project

  • 1. Purpose

  • 2. Product Scope

  • 3. Functional Requirements

  • 3.1 USB Hub Function

  • 3.2 Power Architecture

  • 3.3 Clocking and Reset

  • 3.4 Configuration

  • 3.5 Port Power Control and Protection

  • 3.6 Mechanical / Implementation

  • 4. Product Variants / Open Decisions

  • 5. Compliance / Quality Targets

  • 6. Out of Scope for First Revision

  • 7. Acceptance Criteria

Datasheets & reference material: Files, Datasheet & Reference Material Demo Project

Datasheets & reference material: Files, Datasheet & Reference Material Demo Project thumbnail
Welcome to your new project. Imagine what you can build here.

Properties

Properties describe core aspects of the project.

Pricing & Availability

See prices from popular manufacturers for your project.

Controls