Infineon Technologies CYUSB3304-BVXI

Overview

CYUSB3304-BVXI from Infineon is a USB 3.2 Gen 1 (5 Gbps) hub controller with four downstream ports, integrated ARM® Cortex®-M0 CPU (16 KB RAM, 32 KB ROM), USB Battery Charging v1.2 compliance per port, shared-link capability for embedded dual-device attachment per port, and industrial temperature range (–40°C to +85°C). It enables compact docking stations and embedded host interfaces requiring simultaneous SuperSpeed and USB 2.0 device connectivity.

For engineers reviewing the CYUSB3304-BVXI datasheet, CYUSB3304-BVXI pinout, CYUSB3304-BVXI application, or CYUSB3304-BVXI equivalent, key selection criteria include SS/USB 2.0 dual-lane routing per port, BC v1.2 ghost charging behavior, I2C-based firmware update support, and pin-strapped configuration of VID/PID, power switch ganging, and non-removable device count.

Technical Context

The CYUSB3304-BVXI integrates two independent hub controllers: an SS hub supporting U0–U3 link power states and full-duplex 5 Gbps operation, and a USB 2.0 hub with four dedicated transaction translators (Multi-TT), L0–L3 power management, and suspend/resume signaling. Its on-chip Cortex-M0 executes runtime battery charging control, vendor-command processing, and shared-link arbitration logic.

Port-level intelligence includes per-port overcurrent detection, VBUS monitoring, LED status signaling (SS/USB 2.0/suspend), and configurable power switch control (ganged or individual, active-high/low polarity). Configuration is supported via pin-straps (no external EEPROM required), I2C slave/master modes, or eFuse programming - enabling flexible BOM optimization in volume production.

Key Specifications

Pinout & Package

Package: 68-pin QFN (8 mm × 8 mm × 1.0 mm), exposed thermal pad, RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB 3.2 Gen 1 hub applications.

Compared with CYUSB3314-BVXI, CYUSB3304-BVXI trades ACA-Dock and LED indicators for smaller footprint and lower pin count; versus USB3347-AEZG, it delivers autonomous BC v1.2 and shared-link execution without host MCU involvement - reducing system-level firmware complexity and latency.

Availability

CYUSB3304-BVXI is available at Aetrix Electronics and suitable for docking stations, embedded industrial hosts, monitor-integrated hubs, and smart TV peripheral expansion requiring stable component supply, industrial temperature operation, and USB-IF certification.

Supply support for CYUSB3304-BVXI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor manufacturer specializing in power management, sensing, connectivity, and security solutions for automotive, industrial, and consumer markets.

CYUSB3304-BVXI belongs to the EZ-USB™ HX3 family, designed specifically for space-constrained, cost-sensitive USB 3.2 Gen 1 hub applications requiring autonomous battery charging, embedded shared-link topology, and minimal external components.

FAQ

Does CYUSB3304-BVXI support USB 3.2 Gen 2 (10 Gbps)?

No. CYUSB3304-BVXI complies strictly with USB 3.2 Gen 1 (5 Gbps) and USB 2.0 specifications. It does not implement Gen 2 TX/RX equalization, 10 Gbps clock recovery, or Gen 2-specific link training sequences. Designs requiring 10 Gbps must use a Gen 2–capable hub such as CYUSB3324.

Can the Cortex-M0 be used for custom firmware development?

Yes. The ARM Cortex-M0 subsystem provides 16 KB RAM and 32 KB ROM accessible via I2C or USB vendor commands. Infineon's Blaster Plus tool enables firmware customization for GPIO logic, charging profiles, and descriptor strings - though ROM-resident bootloader and USB stack are fixed and not modifiable.

What is the maximum total power budget for all four downstream ports?

The CYUSB3304-BVXI itself consumes ≤320 mW (typical) at full 5 Gbps load. External power switches determine total port current; with standard 1.5 A per-port BC v1.2 DCP mode, total theoretical draw is 6 A - but actual limit depends on board-level thermal design and switch FET R_DS(on), per Section 10.2 of the datasheet.

Is pin-strapping the only way to configure VID/PID without EEPROM?

Yes. Pin-strapping (via STRAP[3:0]) is the sole method to set VID/PID, active port count, and BC v1.2 enable state without external I2C EEPROM. eFuse and I2C configuration require pre-programmed memory or host-initiated writes - neither replaces pin-strap flexibility for factory-set static parameters.