USB2228-NU-09 USB 2.0 Flash Media Controller | Microchip
MPN: USB2228-NU-09 ✓ ActiveUSB2228-NU-09 Overview
A USB flash media controller is a specialized interface IC within the USB interface and controller hierarchy. Its purpose is to translate commands and data between a USB host and removable flash-memory media, allowing host software to access supported cards through a standardized peripheral interface. The USB2228 belongs to Microchip's fourth-generation USB 2.0 flash-card media-controller family and combines device interfacing, media support, and on-chip controller functions in one surface-mount package.
The controller operates at a 3.3 V supply and supports USB 2.0. Its 128-pin VTQFP package provides the required external connections for flash media, USB data, control, clocking, and supporting circuitry. The 14 mm by 14 mm package is designed for surface-mount assembly on embedded boards. Microchip identifies the USB2228 as supporting xD-Picture Card format for licensees of that format, making it relevant to specialized portable-media equipment.
The USB2228 family is intended to connect a USB host controller to flash-media cards rather than replace the host controller itself. This separation allows a system processor to manage USB traffic while the USB2228 handles the electrical and protocol-facing interface to compatible flash media. Its specialized role makes it suitable for legacy and niche embedded media systems where supported card formats and established firmware are important.
Typical applications include dedicated media readers, industrial data-collection equipment, portable diagnostic systems, and specialized embedded appliances that must exchange files with flash memory cards. Consumer peripheral, industrial automation, and automotive equipment can also use this controller when their system architecture matches the supported media and electrical requirements. Firmware and host-driver compatibility should be validated before production deployment.
The most important design step is to follow the manufacturer datasheet for pin assignment, supply sequencing, clock requirements, media interfaces, and external component selection. Because this is a 128-pin legacy-class controller, PCB layout, impedance control, and firmware support can be as important as the nominal USB 2.0 capability. Confirm that the required flash-media formats and host software are supported by the exact device variant.
This product record combines the manufacturer interface description, package and supply information, source documentation, and engineering guidance for USB2228-NU-09. It also distinguishes the known functions of the USB2228 from the broader class of USB host controllers, helping designers determine whether a dedicated flash-media bridge is required before committing a board layout and firmware stack.
Drop-in alternatives for USB2228-NU-09 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with USB2228-NU-09 (same form factor and footprint) — differing in Controller Generation, Product Type, xD-Picture Card Support.
No drop-in alternatives available for this product.
Request AlternativesUSB2228-NU-09 Specifications
| Product Type | USB 2.0 Flash Media Controller |
| USB Interface Version | USB 2.0 |
| Supply Voltage | 3.3 V |
| Package Type | 128-pin VTQFP |
| Package Body Size | 14 mm x 14 mm |
| Pin Count | 128 pins |
| Mounting Type | Surface Mount |
| Controller Generation | 4th Generation USB 2.0 Flash Card Media Controller |
| Media Interface Role | Interface between USB host controller and flash media cards |
| Supported Flash Media | Flash memory cards |
| xD-Picture Card Support | Yes, for licensees of the xD-Picture Card format |
| USB Host Requirement | External USB host controller |
| Data Interface | USB |
USB2228-NU-09 14 mm x 14 mm Pin Configuration Guide
Pin configuration for USB2228-NU-09 (14 mm x 14 mm package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for USB2228-NU-09.
Refer to the datasheet for full pin configuration.
Typical Applications
USB2228-NU-09 is suitable for 6 applications: Dedicated USB Flash-Media Reader, Industrial Data Logger, Portable Diagnostic Instrument, Specialized Flash-Card Appliance, Embedded Media Gateway, Automated Test and Measurement Equipment.
Dedicated USB Flash-Media Reader
The USB2228-NU-09 fits a reader designed around a USB host controller and removable flash-memory cards. Its USB 2.0 interface and dedicated flash-media role separate card-access circuitry from the system host, allowing the host processor to manage files through a defined device stack. The 3.3 V supply and 128-pin VTQFP package make the controller appropriate for an embedded board rather than a compact external reader. Designers should use the manufacturer pin table and supported-media list to define the card interface, clocking, and firmware. Verify the exact card formats, insertion behavior, and host-driver workflow before production because USB 2.0 alone does not establish full application compatibility.
Recommended
Industrial Data Logger
An industrial data logger can use the USB2228-NU-09 to add removable flash-media storage around a USB host controller. The controller's USB 2.0 interface and 3.3 V operating supply fit equipment that periodically exports records to flash cards. Its specialized bridge role can reduce the need to connect supported media directly to the main application processor. For a robust design, define file-system handling, write-protection behavior, card-removal timing, and brownout recovery in host firmware. The 128-pin VTQFP package requires a dense but deterministic land pattern, so follow the manufacturer package drawing and keep sensitive USB and media-routing paths away from noisy power-conversion circuitry.
Recommended
Portable Diagnostic Instrument
The USB2228-NU-09 is applicable to portable diagnostic equipment that collects logs or service records on flash media while maintaining a USB-connected host architecture. Its USB 2.0 interface supports a recognizable peripheral role, while the dedicated flash-media controller function handles communication with compatible cards. A 3.3 V supply and 14 mm by 14 mm 128-pin VTQFP package suit ruggedized boards requiring several external media and control connections. Engineers should consider card-format support, file-system compatibility, host software availability, and safe removal before selecting the controller. Keep the implementation aligned with the manufacturer datasheet for signal integrity, clocking, and external component requirements.
Recommended
Specialized Flash-Card Appliance
A specialized appliance that must exchange data with supported flash cards can use the USB2228-NU-09 as the media-facing controller behind a USB host. This approach is relevant when the product is designed around established removable-media behavior rather than a general-purpose peripheral role. The controller provides a USB 2.0 interface, operates at 3.3 V, and supports xD-Picture Card for licensees of that format. Because xD support is format-specific and license-controlled, confirm both hardware and software requirements. Use the manufacturer documentation to select the card connector, clock components, bypass capacitors, and host firmware, and verify the complete design with representative media before production release.
Recommended
Embedded Media Gateway
The USB2228-NU-09 can support an embedded media gateway that bridges an external USB host to removable flash storage. Such a design may serve legacy equipment, maintenance systems, or controlled data-transfer workflows where supported media formats are established. The dedicated controller role keeps flash-card access separate from the host processor's other interfaces, while USB 2.0 establishes the external peripheral standard. The 3.3 V supply and 128-pin VTQFP package require careful layout planning at 14 mm by 14 mm. Engineers should validate throughput, command timing, media endurance assumptions, and fault recovery. Do not substitute another flash controller without proving pin and media compatibility.
Recommended
Automated Test and Measurement Equipment
Automated test equipment can use the USB2228-NU-09 when it must transfer test records through supported flash media while retaining a separate USB host architecture. The controller's USB 2.0 interface and flash-media role provide a defined path between the host and cards, helping isolate media handling from timing-sensitive measurement circuitry. The 3.3 V supply and 128-pin VTQFP package support integration into a larger controller board, but the dense package demands disciplined power and signal routing. Keep switching supplies and high-current peripherals away from USB and media interfaces, follow the manufacturer reference configuration, and validate continuous write, card insertion, removal, and power-loss scenarios before using it as a long-term archive medium.
Recommended
Recommended Products Summary
Engineering reference data for USB2228-NU-09 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Brand | Microchip Technology |
| Package | 128-pin VTQFP, 14 mm x 14 mm |
| USB Version | USB 2.0 |
| Supply Voltage | 3.3 V |
| Product Function | Interface between a USB host controller and flash media cards |
| Controller Generation | 4th Generation USB 2.0 Flash Card Media Controller |
| xD-Picture Card Support | Supported for licensees of the xD-Picture Card format |
| Mounting Type | Surface Mount |
| Pin Count | 128 pins |
Key Differentiators
- Dedicated flash-media interface role (vs USB2227-NU-05)
- Exact 128-pin surface-mount implementation (vs USB2227-NU-05)
- Established USB 2.0 flash-card media positioning (vs USB2227-NU-05)
Design Notes
Assign the PCB footprint directly from the Microchip USB2227/USB2228 package drawing rather than from a generic VTQFP library. Confirm the 14 mm by 14 mm body, exposed-pad requirements, solder-mask opening, paste pattern, and pin-one orientation against the exact orderable device. The 128-pin footprint leaves little routing room, so reserve space for media, USB, clock, control, and power nets before placing the host controller or storage components.
Implement the 3.3 V supply using the manufacturer reference configuration and verify local bypass placement at the supply pins. Separate noisy digital and flash-media return currents from sensitive USB signal returns where the datasheet layout permits. Because the controller is a large, multi-pin device, review every required power and ground connection during schematic review; a connection omitted because it appears unused can create enumeration, signal-integrity, or stability problems.
Route USB differential pairs as a controlled-impedance pair and minimize stub branches, vias, and unnecessary looping. Keep the paths away from switching-regulator inductors, high-current switching nodes, and mechanically unstable connectors. Apply the USB 2.0 layout and impedance guidance cited by the manufacturer, and validate the completed board with eye diagrams or compliance-oriented signal-integrity measurements under representative loading conditions.
Do not treat USB2227 or USB2228 family variants as automatically interchangeable. Before substituting any MPN, compare the 128-pin assignments, 3.3 V electrical conditions, clock requirements, supported flash-media formats, xD licensing needs, and on-chip firmware behavior. A matching package name is insufficient for a drop-in decision, and a USB 2.0 label does not guarantee that host software or the intended card formats will work without adaptation.
Compliance Information
Compliance status was not explicitly stated in the manufacturer product page, family datasheet excerpt, or component listings. These fields remain unknown rather than being inferred from the package or product age.