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Infineon Technologies AN2131QC
- Part No.:
- AN2131QC
- Manufacturer:
- Infineon Technologies
- Category:
- Application Specific Microcontrollers
- Package:
- 80-QFP
- Datasheet:
-
AN2131QC.pdf
- Description:
- IC MCU 8051 8K RAM 24MHZ 80BQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,444
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Product details
Overview
AN2131QC from Cypress Semiconductor is a USB 1.1-compliant, 8051-based microcontroller with integrated USB transceiver, 16 KB on-chip ROM, 2 KB RAM, and configurable I/O ports - designed for embedded USB peripheral development requiring firmware-reloadable device enumeration and ReNumeration™ capability. It supports bulk, interrupt, and isochronous transfers and operates at up to 24 MHz with internal oscillator or external crystal.
For engineers reviewing the AN2131QC datasheet, AN2131QC pinout, AN2131QC application, or AN2131QC equivalent, this device serves as a programmable USB interface controller for HID, data acquisition, and custom peripheral designs where host-driven firmware loading and dynamic descriptor reconfiguration are required.
Technical Context
The AN2131QC integrates an enhanced 8051 CPU core with USB 1.1 physical layer, supporting full-speed (12 Mbps) operation and automatic endpoint zero handling. It implements ReNumeration™ to allow runtime switching between multiple USB device descriptors without hardware reset.
Its memory architecture includes 16 KB mask-ROM for boot code and firmware loader, 2 KB SRAM, and external memory expansion via CS#/OE# control. The I²C controller enables EEPROM-based descriptor storage and firmware configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| USB Compliance | USB 1.1 Full-Speed (12 Mbps); handles all standard descriptors and control requests autonomously |
| CPU Core | Enhanced 8051 with 2-cycle instruction execution; supports 24 MHz clock for real-time transfer scheduling |
| On-chip Memory | 16 KB ROM (bootloader + USB stack), 2 KB SRAM (data + firmware variables) |
| Transfer Types | Bulk, interrupt, isochronous, and control transfers; dual-buffered endpoints with auto-data-toggle |
| I/O Capability | 40-pin QFP package with 24 configurable GPIO pins; supports I²C master mode for EEPROM interfacing |
| Enumeration Mode | ReNumeration™ enabled: allows dynamic descriptor reload from external EEPROM without device reset |
| Power Supply | 3.0–5.25 V operation; internal regulator supports single-supply USB bus-powered designs |
Pinout & Package
AN2131QC is housed in a 44-pin QFP (Quad Flat Package) with 0.8 mm pitch, thermally enhanced for industrial ambient operation. Pin functions include USB D+/D− differential pair, 24 general-purpose I/O lines, I²C SCL/SDA, reset, oscillator inputs, and power/ground terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D+ / D− | USB differential data pair | Full-speed USB physical interface; internally terminated; requires no external transceiver |
| XTAL1 / XTAL2 | Crystal oscillator inputs | Supports 6–24 MHz crystal or external clock source for USB timing accuracy |
| RESET | Active-low reset input | Synchronizes CPU and USB core; debounced internally for robust power-up sequencing |
| I2CSCL / I2CSDA | I²C bus interface | Master-only I²C port for reading device descriptors and configuration from external EEPROM |
| P0.0–P0.7 | Port 0 bidirectional I/O | Open-drain capable; used for address/data multiplexing when expanding external memory |
| P1.0–P1.7 | Port 1 general-purpose I/O | Configurable pull-up; supports interrupt-on-change for wake-from-suspend detection |
| VCC / GND | Power supply terminals | Single 3.0–5.25 V supply; internal LDO regulates USB PHY voltage independently |
Key Features
| Feature | Design Value |
|---|---|
| ReNumeration™ | Runtime USB descriptor reload from external EEPROM without disconnect/re-enumeration |
| Integrated USB Transceiver | Eliminates need for external PHY; meets USB electrical compliance with on-die termination |
| Autopointer Architecture | Hardware-managed buffer pointer for zero-overhead bulk transfer chaining |
| I²C Boot Loader | Loads initial firmware or descriptors from I²C EEPROM during power-on or reset |
| Endpoint Zero Automation | Fully hardware-handled control transfers; reduces firmware overhead for standard USB requests |
Applications
| USB Human Interface Device (HID) | Data Acquisition Peripheral |
|---|---|
|
Use Scenario: Custom keyboard, mouse, or game controller with vendor-defined reports. IC Role / Device Role / Timing Role: USB device controller managing HID report descriptors, interrupt IN transfers, and host-initiated control requests. Use Value: ReNumeration™ enables field-upgradable report descriptors without changing hardware or requiring driver updates. |
Use Scenario: Sensor interface module streaming analog/digital readings to PC via USB. IC Role / Device Role / Timing Role: Bulk-transfer endpoint manager with autopointer buffering for continuous data flow. Use Value: Dual-buffered bulk endpoints sustain >90% USB bandwidth utilization at 12 Mbps with minimal CPU intervention. |
| Industrial USB Adapter | USB-to-Serial Bridge Prototype |
|
Use Scenario: Field-deployable USB interface for legacy RS-485 or CAN devices. IC Role / Device Role / Timing Role: Firmware-configurable USB device acting as protocol translator with descriptor-switching capability. Use Value: Single hardware design supports multiple device classes (CDC, vendor-specific) via EEPROM-loaded descriptors. |
Use Scenario: Low-volume debug bridge converting UART signals to USB CDC ACM class. IC Role / Device Role / Timing Role: USB CDC device controller implementing abstract control model and line coding negotiation. Use Value: On-chip ROM contains CDC class-compliant firmware; eliminates external flash for basic functionality. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB peripheral controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AN2136SC | Same core and USB engine, but 32 KB ROM and added GPIO interrupt masking logic | Preferred for complex HID or multi-interface devices requiring larger firmware footprint | Select when >16 KB ROM is needed for descriptor tables, encryption, or extended protocol stacks |
| CY7C63100A | Legacy Cypress USB microcontroller with 1 KB RAM, no ReNumeration™, and limited endpoint count | Suitable only for static-configuration devices like simple HID or low-bandwidth sensors | Choose only for cost-sensitive, fixed-function designs where descriptor flexibility is unnecessary |
Compared with AN2131QC, AN2136SC offers expanded ROM for richer firmware while retaining identical USB behavior; CY7C63100A lacks runtime descriptor reloading and endpoint flexibility, limiting it to simpler, unchanging USB roles.
Availability
AN2131QC is available at Aetrix Electronics and suitable for USB peripheral development, industrial adapter design, and embedded HID implementation requiring stable component supply and long-term firmware maintainability.
Supply support for AN2131QC 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
Cypress Semiconductor (now part of Infineon Technologies) is a fabless semiconductor company specializing in programmable system-on-chip solutions for connectivity, human-machine interface, and embedded control.
The EZ-USB product line was engineered to simplify USB peripheral integration by embedding both protocol stack and physical layer into a single MCU, targeting rapid prototyping and firmware-defined device behavior.
FAQ
Does AN2131QC require an external USB transceiver?
No. AN2131QC integrates a full-speed USB 1.1 transceiver with on-die termination and differential signaling circuitry. D+ and D− pins connect directly to the USB connector with only 1.5 kΩ pull-up resistor on D+ for device speed identification. No external PHY chip is needed.
How does ReNumeration™ work without resetting the USB connection?
ReNumeration™ uses a vendor-specific USB request to trigger reload of device descriptors from external I²C EEPROM. The USB core suspends traffic, reinitializes endpoint configuration and string descriptors, then resumes enumeration state-preserving the same bus address and avoiding host-side disconnect events.
What is the role of the Autopointer in bulk transfers?
The Autopointer is a hardware register that automatically increments and wraps within designated RAM buffers during bulk IN/OUT operations. It eliminates software pointer management overhead and prevents buffer overflow by synchronizing with endpoint FIFO status flags and ACK/NACK handshaking.
Can AN2131QC operate from USB bus power alone?
Yes. AN2131QC supports single-supply operation from 3.0–5.25 V, including direct USB VBUS (4.75–5.25 V). Its internal regulator supplies clean 3.3 V to the USB transceiver, enabling fully bus-powered designs without external LDOs or charge pumps.
AN2131QC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- EZ-USB™
- Package/Case:
- 80-QFP
- Packaging:
- Bag
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Applications:
- USB Microcontroller
- Core Processor:
- 8051
- Program Memory Type:
- ROMless
- Controller Series:
- AN213x
- RAM Size:
- 8K x 8
- Interface:
- I2C, USB
- Number of I/O:
- 24
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 80-PQFP
AN2131QC FAQ
1.How can I place an order for AN2131QC through Aetrix?
Please submit a Request for Quotation (RFQ) for AN2131QC 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 AN2131QC reliable?
The price and inventory of AN2131QC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AN2131QC is usually 5 days.
3.What payment methods are accepted for AN2131QC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AN2131QC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AN2131QC?
AN2131QC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AN2131QC 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 AN2131QC?
For technical support, including AN2131QC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AN2131QC requirements.
6.How does Aetrix verify that AN2131QC is sourced from the original manufacturer or authorized distributors?
All AN2131QC 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 AN2131QC meets industry standards.
7.What is the process for return or replacement of AN2131QC?
All AN2131QC units undergo pre-shipment inspection (PSI). If there is an issue with AN2131QC, 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 AN2131QC part is unused and in its original packaging.
Return procedure for AN2131QC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AN2131QC Tags
-
CYPD3175-24LQXQ
Infineon Technologies
-
SLB9672VU20FW1523XTMA1
Infineon Technologies
-
SLB9670VQ20FW785XTMA1
Infineon Technologies
-
SLB9672XU20FW1523XTMA1
Infineon Technologies
-
SLB9673XU20FW2613XTMA1
Infineon Technologies
-
CYPD3125-40LQXIT
Infineon Technologies
-
AT97SC3204-U2A1A-20
Microchip Technology
-
AT97SC3204-U2A1A-10
Microchip Technology
-
SLM9670AQ20FW1311XTMA1
Infineon Technologies
-
SLB9672XU20FW1613XTMA1
Infineon Technologies
-
SLB9672AU20FW1613XTMA1
Infineon Technologies
-
SLB9673AU20FW2613XTMA1
Infineon Technologies
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