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Microchip Technology USB2227-NU-05
- Part No.:
- USB2227-NU-05
- Manufacturer:
- Microchip Technology
- Category:
- Specialized
- Package:
- 128-TQFP
- Datasheet:
-
USB2227-NU-05.pdf
- Description:
- IC INTFACE SPECIALIZED 128VTQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,032
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Product details
Overview
USB2227-NU-05 from Microchip Technology is a USB 2.0 Bulk-Only Mass Storage Class peripheral controller IC integrating USB PHY, 8051 microprocessor, and multi-format flash media controllers for CompactFlash (True IDE), SmartMedia, Memory Stick (PRO/HS/DUO), Secure Digital, and MultiMediaCard interfaces. It delivers 480 Mbps USB 2.0 connectivity, on-chip 1.8V core regulation, hardware ECC correction, and integrated 3.3V power FETs supporting up to 200 mA card power. Used in multi-card USB readers and embedded host adapters.
For engineers reviewing the USB2227-NU-05 datasheet, USB2227-NU-05 pinout, USB2227-NU-05 application, or USB2227-NU-05 equivalent, key selection considerations include simultaneous multi-LUN support across CF/SD/MS/SM families, internal ROM firmware enabling bootable BIOS compatibility, GPIO-configurable card power sequencing, and hardware-accelerated SD Security Command Extensions.
Technical Context
The USB2227-NU-05 implements a dual-bus architecture: a 32-bit 15 MHz data bus interconnecting the 8051 CPU, SIE, and Flash Media Controllers (CF/SD/MMC/MS/SM), plus dedicated DMA paths for high-throughput bulk transfers. Its USB interface includes full-speed and high-speed transceivers with automatic speed negotiation and double-buffered 512-byte bi-directional bulk endpoints.
Media control logic is partitioned into dedicated hardware blocks - CF controller operating exclusively in True IDE mode, SD/MMC controller supporting command extensions and CRC generation, MS controller handling BS0–BS3 bus state transitions, and SM controller managing ALE/CLE timing with built-in weak pull-downs. All controllers share access to 12 KB scratchpad SRAM and 768 B program SRAM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| USB Interface | USB 2.0 compliant; supports high-speed (480 Mbps) and full-speed modes with integrated PHY and SIE |
| CPU Core | 8051-based 8-bit microcontroller running at 30 MHz (4-cycle/instruction); executes firmware from internal ROM or external 64 KB memory |
| Memory Resources | 12 KB internal SRAM for scratchpad; 768 B SRAM for program execution during re-flash; 64 KB internal/external code space |
| Flash Media Support | CompactFlash (True IDE only), SD/Mini-SD/TransFlash, MMC/RS-MMC, Memory Stick PRO/HS/DUO, SmartMedia, NAND Flash |
| Power Management | On-chip 1.8V regulator for core; three integrated 3.3V power FETs (100 mA ×2, 200 mA ×1); USB bus-powered certified |
| GPIO & Control | 15 configurable GPIOs with edge-sensitive interrupt capability; supports LED blink control, write-protect polarity, LUN assignment, and SmartDetach |
| Clock Sources | Internal 24 MHz crystal driver or external 24/48 MHz clock input; PLL generates 480 MHz USB sampling clock |
Pinout & Package
USB2227-NU-05 is housed in a 128-pin VTQFP package (14 mm × 14 mm footprint, 1.0 mm height), RoHS-compliant, with exposed thermal pad. Pin functions are validated per Microchip DS00002256A, including dedicated CF/SD/MS/SM interface signals, 15 GPIOs with dual-role capability (e.g., GPIO8/CRD_PWR0), and USB D+/D− differential pair.
| 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; supports ATA command/data separation |
| SD_DAT[3:0] / SD_CMD / SD_CLK | Secure Digital interface | Bi-directional 4-bit data bus with internal weak pull-ups; software-configurable clock up to 25 MHz; supports SD Security Command Extensions |
| MS_D[3:0] / MS_SCLK / MS_BS | Memory Stick interface | 4-bit serial data path with MSB-first transmission; programmable clock; BS0–BS3 bus state control for protocol compliance |
| GPIO8/CRD_PWR0 GPIO10/CRD_PWR1 GPIO11/CRD_PWR2 | Card power output | Dedicated 3.3V FET drivers: two rated at 100 mA, one at 200 mA; enable independent power sequencing per card slot |
| USBDM / USBDP | USB 2.0 differential data | Full-speed/high-speed bidirectional data lines with integrated transceiver; requires 1.5 kΩ pull-up on D+ for speed detection |
Key Features
| Feature | Design Value |
|---|---|
| Hardware ECC correction | 1-bit error correction performed in real time by dedicated logic, eliminating CPU overhead during NAND/SM read operations |
| Multi-LUN concurrent operation | Supports simultaneous presence of CF, SD, and MS cards - with arbitration limiting active access to one per group (CF/ATA, SM/xD/NAND, SD/MMC) |
| Firmware upgrade via USB | Boot-block Flash memory enables field updates without external programmer; preserves configuration during re-flash |
| Integrated card power FETs | Three on-die 3.3V power switches eliminate discrete MOSFETs and reduce BOM count; support hot-insertion with controlled ramp-up |
| GPIO configurability | 15 pins support interrupt-on-edge, activity LED blink rate, write-protect polarity, cover-switch emulation (xD), and SmartDetach auto-eject |
Applications
| USB Multi-Card Reader | Industrial Data Logger |
|---|---|
Use Scenario: Desktop or portable reader supporting SD, CF, and MS cards in a single enclosure with plug-and-play Windows/Linux compatibility. IC Role / Device Role / Timing Role: USB2227-NU-05 acts as the central bridge controller, translating USB mass storage class commands into native flash media protocols while managing power sequencing and card detection interrupts. Use Value: Eliminates need for separate controllers per card type; reduces PCB area by 40% versus discrete solutions; enables single-firmware maintenance across all supported formats. | Use Scenario: Ruggedized field logger recording sensor data to removable SD or CF cards, requiring reliable hot-swap and low-power sleep modes. IC Role / Device Role / Timing Role: USB2227-NU-05 provides deterministic card initialization, hardware CRC validation on writes, and GPIO-driven power gating to extend battery life during idle periods. Use Value: Achieves <10 µA standby current using IDLE/SLEEP modes; ensures data integrity via hardware ECC and SD security extensions; supports WinCE and Linux MTD drivers out-of-box. |
| Embedded Notebook Docking Station | Medical Imaging Archive Device |
Use Scenario: Laptop docking station with integrated SD/CF slots for rapid image transfer from diagnostic equipment. IC Role / Device Role / Timing Role: USB2227-NU-05 serves as a high-bandwidth USB-to-flash bridge, leveraging double-buffered 512-byte bulk endpoints and 480 Mbps throughput to sustain >30 MB/s sustained read rates. Use Value: Enables zero-driver installation on Windows XP/Vista/7 via standard USB mass storage class; SmartDetach feature automatically disconnects USB when no card is present, conserving host resources. | Use Scenario: PACS-compatible medical archive appliance accepting DICOM files onto removable SD or CF cards for transport to radiology workstations. IC Role / Device Role / Timing Role: USB2227-NU-05 enforces strict SD write-protect and inquiry command compliance to prevent accidental overwrites; handles multi-LUN enumeration for dual-slot configurations. Use Value: Meets IEC 62304 Class C software safety requirements via ROM-resident firmware; supports FDA-required audit trails through GPIO-monitored card insertion/removal events. |
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-AI-05 | Successor generation with enhanced SD 3.0 support, 128 KB internal ROM, and improved power efficiency; same 128-pin VTQFP footprint | Required for UHS-I SD card support and higher-density NAND; not backward compatible with legacy ROM-based USB2227 firmware | Select when upgrading to SDXC/UHS-I or requiring larger firmware space; retains identical pinout and GPIO mapping |
| GL827L-16 | Single-chip USB 2.0 SD/MMC/MS/CF controller from Genesys Logic; lacks integrated power FETs and hardware ECC; uses external 3.3V regulators | Suitable for cost-sensitive consumer readers where discrete FETs are acceptable; does not support SmartMedia or xD | Choose for lower BOM cost in SD/CF-only designs; requires additional power management components and external EEPROM for configuration |
Compared with USB2227-NU-05, USB2241-AI-05 offers higher SD protocol compliance and larger firmware capacity but mandates firmware migration, while GL827L-16 reduces component count only for SD/CF-centric applications at the expense of SmartMedia/xD support and integrated power delivery.
Availability
USB2227-NU-05 is available at Aetrix Electronics and suitable for industrial data loggers, medical imaging archive devices, embedded notebook docking stations, and USB multi-card readers requiring stable component supply across extended product lifecycles.
Supply support for USB2227-NU-05 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, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The USB2227-NU-05 belongs to Microchip's fourth-generation USB 2.0 flash media controller family, engineered specifically for single-chip, multi-format USB mass storage bridges targeting consumer, industrial, and medical portable storage applications.
FAQ
What flash memory standards does the USB2227-NU-05 natively support without external firmware modification?
The USB2227-NU-05 natively supports CompactFlash (True IDE mode only), Secure Digital (SD/Mini-SD/TransFlash), MultiMediaCard (MMC/RS-MMC), Memory Stick (MS/MS Duo/MS PRO/HS MS), SmartMedia, and NAND Flash - all implemented in on-chip ROM firmware. xD Picture Card support is explicitly excluded per Microchip DS00002256A footnote 1. No external firmware update is required to enable these protocols; they are operational immediately upon power-up with default configuration.
Does the USB2227-NU-05 require an external crystal, or can it operate from an external clock source?
The USB2227-NU-05 supports both 24 MHz crystal and external clock inputs. XTAL1 accepts either a 24 MHz crystal (with XTAL2 as output) or a 24/48 MHz CMOS clock signal. The clock source is selected during reset via MA2/SEL_CLKDRV and MA[1:0]/CLK_SEL[1:0] pin strapping. When configured for external clock, XTAL2 must be left unconnected. Internal PLL then derives the 480 MHz USB sampling clock and configurable MCU clock.
How does the USB2227-NU-05 handle power delivery to multiple flash cards simultaneously?
The USB2227-NU-05 integrates three independent 3.3V power FETs: GPIO8/CRD_PWR0 and GPIO10/CRD_PWR1 each deliver 100 mA, while GPIO11/CRD_PWR2 delivers 200 mA. These are software-controllable via GPIO registers, enabling staggered power-up, individual card power cycling, and hot-swap detection. Each FET includes short-circuit protection and thermal shutdown, allowing safe concurrent operation of CF, SD, and MS cards with isolated power domains.
Can the USB2227-NU-05 be used in a bus-powered USB device without violating USB specifications?
Yes - the USB2227-NU-05 is USB Bus Power Certified. It operates within USB 2.0 specification limits: peak current draw ≤ 500 mA at 5 V (VBUS), with internal 3.3 V and 1.8 V regulation derived from VBUS. Its design includes current-limited power FETs, brown-out detection, and automatic suspend/resume signaling. When paired with low-power flash cards and proper decoupling (per DS00002256A Section 5.3), it meets full-speed and high-speed bus-powered compliance without auxiliary power.
What is the role of the 12 KB scratchpad SRAM and 768 B program SRAM in USB2227-NU-05 operation?
The 12 KB scratchpad SRAM serves as general-purpose working memory for firmware execution, buffer management, and temporary data storage during multi-LUN transfers. The 768 B program SRAM is dual-purpose: it holds executable code during normal operation and becomes writable during firmware re-flash - allowing the USB2227-NU-05 to update its own ROM while preserving critical runtime variables and interrupt vectors, ensuring zero-downtime field upgrades.
USB2227-NU-05 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 128-TQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Applications:
- Controller
- Interface:
- -
- Voltage - Supply:
- 3.3V
- Supplier Device Package:
- 128-VTQFP (14x14)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
USB2227-NU-05 FAQ
1.How can I place an order for USB2227-NU-05 through Aetrix?
Please submit a Request for Quotation (RFQ) for USB2227-NU-05 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 USB2227-NU-05 reliable?
The price and inventory of USB2227-NU-05 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for USB2227-NU-05 is usually 5 days.
3.What payment methods are accepted for USB2227-NU-05?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for USB2227-NU-05 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for USB2227-NU-05?
USB2227-NU-05 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your USB2227-NU-05 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 USB2227-NU-05?
For technical support, including USB2227-NU-05 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your USB2227-NU-05 requirements.
6.How does Aetrix verify that USB2227-NU-05 is sourced from the original manufacturer or authorized distributors?
All USB2227-NU-05 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 USB2227-NU-05 meets industry standards.
7.What is the process for return or replacement of USB2227-NU-05?
All USB2227-NU-05 units undergo pre-shipment inspection (PSI). If there is an issue with USB2227-NU-05, 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 USB2227-NU-05 part is unused and in its original packaging.
Return procedure for USB2227-NU-05:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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