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Home > Products > Integrated Circuits (ICs) > Interface > Specialized

Microchip Technology USB2228-NU-11

Name: USB2228-NU-11
Brand: Microchip Technology
SKU: USB2228-NU-11
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: USB2228-NU-11

Manufacturer:: Microchip Technology

Category:: Specialized

Package:: 128-TQFP

Datasheet:: USB2228-NU-11.pdf

Description:: IC INTERFACE SPECIALIZED 128TQFP

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Product details

Overview

USB2228-NU-11 from Microchip Technology is a USB 2.0 Bulk-Only Mass Storage Class peripheral controller IC integrating an 8051 CPU core, USB 2.0 PHY/SIE, and multi-format flash media controllers for CompactFlash (True IDE), SmartMedia, xD, Memory Stick (PRO/DUO), Secure Digital, MMC, and NAND. It delivers 480 Mbps USB 2.0 connectivity, on-chip 1.8V core regulation, hardware ECC, and integrated 3.3V power FETs (100–200 mA) for direct card power delivery. Used in multi-card USB readers and embedded host interfaces.

For engineers reviewing the USB2228-NU-11 datasheet, USB2228-NU-11 pinout, USB2228-NU-11 application, or USB2228-NU-11 equivalent, key selection considerations include simultaneous multi-LUN support across CF/SD/MS/SM groups, firmware-upgradable ROM, GPIO-configurable card detection and write-protect logic, and compliance with WinXP/Win2K/Linux/Mac OS mass storage drivers.

Technical Context

The USB2228-NU-11 implements a dual-bus architecture: a 32-bit 15 MHz data bus interconnects the 8051 CPU, SIE, and Flash Media Controllers (CF, SD/MMC, MS, SM), while dedicated DMA paths route data between memory cards and dual-buffered 512-byte bulk endpoints. Its internal PLL generates 480 MHz for USB sampling and configurable MCU clocks (24/48 MHz).

It embeds protocol-specific hardware accelerators: 4-bit HS-Memory Stick circuitry, SD Security Command Extensions support, 1-bit ECC correction engine, and True IDE-mode CF controller with register-level task file access via MA[2:0] and CF_nCS/SA signals. Power management includes three independent GPIO-driven card power FETs (CRD_PWR0–2) and software-controllable sleep/idle modes.

Key Specifications

Parameter	Value and Actual Design Meaning
USB Interface	USB 2.0 Bulk-Only Mass Storage Class compliant; includes integrated transceiver and Serial Interface Engine (SIE)
CPU Core	8051-based 8-bit microcontroller; 30 MHz execution speed (4-cycle/instruction); 12 KB internal SRAM scratchpad + 768 B program SRAM
Memory Support	64 KB internal/external program memory space; supports Flash, SRAM, EPROM; ROMEN pin selects internal vs. external boot
Flash Media Interfaces	Simultaneous support for CF (True IDE only), SD/MMC, Memory Stick PRO/DUO, SmartMedia/xD, NAND; grouped arbitration prevents concurrent use within CF/ATA, SM/xD/NAND, SD/MMC sets
Power Delivery	Three integrated 3.3V power FETs: GPIO8/CRD_PWR0 (100 mA), GPIO10/CRD_PWR1 (100 mA), GPIO11/CRD_PWR2 (200 mA)
Package & Clock	128-pin VTQFP (14 mm × 14 mm, 1.0 mm height); supports 24 MHz crystal or 48 MHz external clock input
Core Voltage	On-chip 1.8 V regulator for digital core; separate 1.8 V PLL supply (VDD18PLL) and 3.3 V I/O supply (VDD33)

Pinout & Package

USB2228-NU-11 is housed in a RoHS-compliant 128-pin VTQFP package (14 mm × 14 mm footprint, 1.0 mm height) with exposed thermal pad. Pin functions are validated per Microchip DS00002256A, including dedicated CF, SD, MS, and SM interface signals, 15 GPIOs (12 general-purpose + 3 card power outputs), and dual 8-bit bidirectional data buses (CF_D[15:0], SM_D[7:0]).

Pin/Terminal	Circuit Role	Design Meaning
CF_nCS0 / CF_nCS1	CompactFlash chip select	Active-low enables task file registers (nCS0) or device (nCS1) in True IDE mode; required for ATA command sequencing
SD_DAT[3:0] / SD_CMD / SD_CLK	Secure Digital interface	4-bit bidirectional data bus with weak pull-ups; command line with pull-up; programmable clock output up to 25 MHz
GPIO8/CRD_PWR0 GPIO10/CRD_PWR1 GPIO11/CRD_PWR2	Card power control outputs	Dedicated 3.3 V FET drivers: two rated at 100 mA (CF/SD group), one at 200 mA (MS/SM group); eliminate external MOSFETs and reduce BOM
MA[15:3] / nMCE / nMRD / nMWR	External memory interface	13-bit address bus + chip/read/write strobes; supports 64 KB external program memory (Flash/SRAM/EPROM) when ROMEN = low
USBDM / USBDP	USB 2.0 differential data pair	Full-speed/high-speed bidirectional signaling; integrated transceiver requires only RBIAS resistor (12 kΩ to VSSA) for bias current setting

Key Features

Feature	Design Value
Multi-format flash media support	Hardware-accelerated controllers for CF (True IDE), SD/MMC, Memory Stick PRO/DUO, SmartMedia/xD, and NAND - enabling single-chip multi-card reader designs without external bridge logic
Firmware-upgradable operation	Supports in-system reprogramming of external Flash via USB bus when "boot block" ROM is used - eliminates need for dedicated programming hardware in field updates
Integrated card power FETs	Three on-die 3.3 V power switches (100/100/200 mA) drive CF, SD/MMC, and MS/SM cards directly - reduces board area, component count, and power path complexity
Hardware ECC & security	1-bit error correction performed in hardware for NAND/SM; SD Security Command Extensions implemented in silicon - improves data integrity and enables secure content transfer
Configurable GPIO functionality	15 GPIOs support edge-sensitive interrupts, LED blink control, card detection, write-protect polarity inversion, SmartDetach, and LUN assignment - simplifies system-level integration and OEM customization

Applications

USB Multi-Card Reader	Industrial Data Logger
Use Scenario: Desktop or portable USB reader supporting SD, CF, and MS cards for photo/video transfer. IC Role / Device Role / Timing Role: USB 2.0 peripheral controller managing concurrent LUN enumeration, card hot-swap detection, and protocol translation between USB MSC class and native flash interfaces. Use Value: Eliminates need for discrete USB PHY, microcontroller, and multiple media controllers - reduces BOM cost by ~40% versus discrete solutions while maintaining full driver compatibility.	Use Scenario: Ruggedized field logger recording sensor data to removable SD or CF cards in remote locations. IC Role / Device Role / Timing Role: Embedded host controller handling power-fail-safe writes, card insertion/removal interrupts (via GPIO11/CRD_PWR2 and SM_nCD), and firmware-over-USB field updates. Use Value: On-chip 1.8 V regulator and 3.3 V FETs enable single-rail 3.3 V input; SmartDetach feature auto-detaches USB when no card is present - conserves host power during idle periods.
Notebook ExpressCard Adapter	Medical Imaging Device
Use Scenario: ExpressCard-to-SD/CF adapter enabling legacy notebooks to accept modern flash cards. IC Role / Device Role / Timing Role: USB 2.0 peripheral bridging ExpressCard's PCIe/USB interface to SD and CF physical layers with True IDE timing compliance. Use Value: Hardware CF True IDE controller ensures full ATA command set support (including IDENTIFY DEVICE), enabling bootable CF storage - critical for legacy BIOS compatibility.	Use Scenario: Portable ultrasound unit storing DICOM images to SD cards under strict regulatory timing constraints. IC Role / Device Role / Timing Role: Deterministic flash media controller with hardware ECC and CRC offload - guarantees data integrity during high-throughput image bursts without CPU intervention. Use Value: Dual-buffered 512-byte bulk endpoint and 15 MHz internal data bus sustain >35 MB/s sustained read throughput - meets DICOM PS3.10 archival latency requirements.

USB Multi-Card Reader

Industrial Data Logger

Use Scenario: Desktop or portable USB reader supporting SD, CF, and MS cards for photo/video transfer.

IC Role / Device Role / Timing Role: USB 2.0 peripheral controller managing concurrent LUN enumeration, card hot-swap detection, and protocol translation between USB MSC class and native flash interfaces.

Use Value: Eliminates need for discrete USB PHY, microcontroller, and multiple media controllers - reduces BOM cost by ~40% versus discrete solutions while maintaining full driver compatibility.

Use Scenario: Ruggedized field logger recording sensor data to removable SD or CF cards in remote locations.

IC Role / Device Role / Timing Role: Embedded host controller handling power-fail-safe writes, card insertion/removal interrupts (via GPIO11/CRD_PWR2 and SM_nCD), and firmware-over-USB field updates.

Use Value: On-chip 1.8 V regulator and 3.3 V FETs enable single-rail 3.3 V input; SmartDetach feature auto-detaches USB when no card is present - conserves host power during idle periods.

Notebook ExpressCard Adapter

Medical Imaging Device

Use Scenario: ExpressCard-to-SD/CF adapter enabling legacy notebooks to accept modern flash cards.

IC Role / Device Role / Timing Role: USB 2.0 peripheral bridging ExpressCard's PCIe/USB interface to SD and CF physical layers with True IDE timing compliance.

Use Value: Hardware CF True IDE controller ensures full ATA command set support (including IDENTIFY DEVICE), enabling bootable CF storage - critical for legacy BIOS compatibility.

Use Scenario: Portable ultrasound unit storing DICOM images to SD cards under strict regulatory timing constraints.

IC Role / Device Role / Timing Role: Deterministic flash media controller with hardware ECC and CRC offload - guarantees data integrity during high-throughput image bursts without CPU intervention.

Use Value: Dual-buffered 512-byte bulk endpoint and 15 MHz internal data bus sustain >35 MB/s sustained read throughput - meets DICOM PS3.10 archival latency requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB flash media controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
USB2241-AEZG	Single-chip USB 2.0 SD/MS/CF controller with integrated PHY; lacks NAND/SM/xD support and on-chip 8051 - relies on external host processor for higher-layer protocol handling	Targeted at simpler SD+CF dual-slot readers where NAND/xD compatibility is unnecessary and host-side firmware handles command translation	Select USB2241-AEZG when reducing bill-of-materials is prioritized over multi-format flexibility and autonomous operation
GL827L-QLF	USB 2.0 SD/MMC/MS/CF controller with embedded ARM7TDMI core; supports SDXC/UHS-I but lacks hardware ECC and integrated card power FETs - requires external power management ICs	Suitable for high-bandwidth consumer readers requiring UHS-I SD support, but increases layout complexity due to external 3.3 V/1.8 V regulators and FETs	Choose GL827L-QLF only if UHS-I SD performance (>50 MB/s) is mandatory and external power components are acceptable

Compared with USB2228-NU-11, USB2241-AEZG reduces component count but sacrifices autonomous NAND/xD/SM support and firmware upgradability, while GL827L-QLF adds UHS-I capability at the cost of higher BOM complexity and no on-die ECC or power FETs - making USB2228-NU-11 optimal for cost-sensitive, multi-format, self-contained reader designs.

Availability

USB2228-NU-11 is available at Aetrix Electronics and suitable for USB multi-card readers, industrial data loggers, notebook ExpressCard adapters, and medical imaging devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for USB2228-NU-11 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

Microchip Technology Inc. is a leading provider of microcontroller, analog, FPGA, and connectivity solutions, serving automotive, industrial, consumer, and communications markets with differentiated silicon and development tools.

The USB2227/USB2228 product line was designed specifically for cost-optimized, single-chip USB 2.0 flash media reader applications - integrating media controllers, USB PHY/SIE, 8051 core, and power FETs to replace multi-chip reference designs in consumer and embedded systems.

FAQ

What flash memory formats does the USB2228-NU-11 natively support?

The USB2228-NU-11 natively supports CompactFlash (CF and CF Ultra I/II) in True IDE mode only, SmartMedia (SM), xD Picture Card, Memory Stick (MS), Memory Stick DUO (MSDUO), Memory Stick PRO (MSPRO), Secure Digital (SD), Mini-SD, TransFlash (microSD), MultiMediaCard (MMC), Reduced Size MMC (RS-MMC), and NAND Flash. It implements dedicated hardware controllers for each format, enabling protocol-compliant operation without external translation logic.

Does the USB2228-NU-11 require an external microcontroller?

No, the USB2228-NU-11 integrates a Fast 8051 8-bit microprocessor core running at up to 30 MHz, with 12 KB of internal SRAM for scratchpad use and 768 bytes of program SRAM. It executes firmware from internal ROM or optional external Flash/SRAM/EPROM, eliminating the need for an external MCU in standalone reader applications.

How does the USB2228-NU-11 handle power delivery to different flash cards?

The USB2228-NU-11 integrates three on-chip 3.3 V power FETs: GPIO8/CRD_PWR0 and GPIO10/CRD_PWR1 each deliver 100 mA for CF or SD/MMC cards, while GPIO11/CRD_PWR2 delivers 200 mA for MS/SM cards. These are controlled via GPIO configuration bits and eliminate external power MOSFETs, reducing board space and component count in USB2228-NU-11-based designs.

Is the USB2228-NU-11 compatible with standard USB mass storage drivers?

Yes, the USB2228-NU-11 is fully compliant with the USB 2.0 Bulk-Only Mass Storage Class specification and supports Microsoft Windows XP/ME/2000 SP3, Apple macOS 10.x and OS 8.6/9.x, Linux, and Softconnex drivers. It enumerates as a standard multi-LUN mass storage device, requiring no custom driver installation on supported operating systems.

Can the firmware of the USB2228-NU-11 be updated in the field?

Yes, the USB2228-NU-11 supports firmware upgrades via the USB bus when configured with external Flash memory containing a "boot block" - allowing field updates of application logic, media support enhancements, or bug fixes without physical reprogramming equipment or board removal.

USB2228-NU-11 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 128-TQFP

Packaging:: Tray

Product Status:: Obsolete

Applications:: Controller

Interface:: USB 2.0

Voltage - Supply:: 3.3V

Supplier Device Package:: 128-TQFP (14x14)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

USB2228-NU-11 FAQ

1.How can I place an order for USB2228-NU-11 through Aetrix?

Please submit a Request for Quotation (RFQ) for USB2228-NU-11 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for USB2228-NU-11 reliable?

The price and inventory of USB2228-NU-11 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for USB2228-NU-11 is usually 5 days.

3.What payment methods are accepted for USB2228-NU-11?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for USB2228-NU-11 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for USB2228-NU-11?

USB2228-NU-11 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your USB2228-NU-11 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for USB2228-NU-11?

For technical support, including USB2228-NU-11 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your USB2228-NU-11 requirements.

6.How does Aetrix verify that USB2228-NU-11 is sourced from the original manufacturer or authorized distributors?

All USB2228-NU-11 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that USB2228-NU-11 meets industry standards.

7.What is the process for return or replacement of USB2228-NU-11?

All USB2228-NU-11 units undergo pre-shipment inspection (PSI). If there is an issue with USB2228-NU-11, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The USB2228-NU-11 part is unused and in its original packaging.

Return procedure for USB2228-NU-11:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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