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Infineon Technologies CY8C3666AXI-202
- Part No.:
- CY8C3666AXI-202
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
CY8C3666AXI-202.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,858
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Product details
Overview
CY8C3666AXI-202 from Infineon is a PSoC™ 3 programmable system-on-chip integrating an 8051 CPU core, configurable analog and digital peripherals, 66 kB flash, 8 kB SRAM, and CapSense® capacitive sensing capability in a 100-pin TQFP package. It supports up to 72 general-purpose I/Os with programmable drive strength and operates from 1.71 V to 5.5 V. It is used in human-machine interface (HMI) modules requiring robust touch control and mixed-signal processing.
For engineers reviewing the CY8C3666AXI-202 datasheet, CY8C3666AXI-202 pinout, CY8C3666AXI-202 application, or CY8C3666AXI-202 equivalent, key selection criteria include CapSense® channel count, flash retention at 85°C, USB 2.0 full-speed device support, and programmable analog routing for sensor signal conditioning.
Technical Context
This device implements a single-cycle 8051 CPU running at up to 67 MHz, with hardware-accelerated CapSense® blocks supporting up to 48 self-capacitive or 32 mutual-capacitive sensors. Its analog subsystem includes two 12-bit SAR ADCs, four op-amps, two comparators, and a programmable IDAC for sensor biasing.
The digital fabric comprises eight Universal Digital Blocks (UDBs), each containing PLD and datapath resources, enabling custom logic, PWM generators, counters, and communication protocols (e.g., I²C, SPI, UART) without CPU intervention. USB functionality is implemented via a dedicated full-speed PHY and endpoint controller.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Single-cycle 8051 @ up to 67 MHz - enables deterministic real-time response for HMI and control loops |
| Flash Memory | 66 kB with 100 k-cycle endurance - sufficient for firmware + CapSense® tuning data storage |
| SRAM | 8 kB - supports multiple concurrent sensor channels and USB buffer management |
| CapSense® Channels | Up to 48 self-cap or 32 mutual-cap - enables complex touch panels or proximity arrays |
| USB Interface | Full-speed (12 Mbps) device-only PHY - allows direct PC connectivity without external transceiver |
| Supply Voltage | 1.71 V to 5.5 V - supports battery-powered and industrial rail compatibility |
| I/O Count | 72 GPIO with 25-mA sink/source - drives LEDs, relays, and resistive loads directly |
Pinout & Package
Package: 100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, lead-free, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0[0]–P0[7] | Dedicated CapSense® CSD inputs | Support high-SNR self-capacitive sensing with shield and guard drive capability |
| USBDP/USBDM | USB 2.0 full-speed differential pair | Integrated PHY eliminates need for external USB transceiver or termination resistors |
| VDDA/VSSA | Analog power/ground | Isolated supply domain for ADC, op-amps, and CapSense® reference stability |
| XRES | External reset input | Active-low asynchronous reset with internal pull-up; accepts 1.8–5.5 V logic |
| XTAL1/XTAL2 | Crystal oscillator inputs | Supports 1–24 MHz crystals for precise timing or clock source for USB PLL |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Analog Routing | Permits dynamic reconfiguration of op-amp feedback paths and ADC input sources without hardware change |
| Hardware-Accelerated CapSense® | Offloads touch scanning and baseline tracking from CPU, reducing active current to <100 µA per scan |
| UDB-Based Custom Logic | Enables implementation of proprietary communication protocols or motor commutation logic in hardware |
| USB Device Stack Support | Includes CDC, HID, and MSC class drivers in PSoC Creator™ - no external firmware stack required |
| Temperature Range | -40°C to +85°C industrial grade - validated for automotive cabin and industrial HMI environments |
Applications
| Industrial Control Panel | Automotive Cabin Touchpad |
|---|---|
Use Scenario: Operator interface on PLC-mounted HMIs with button, slider, and proximity wake-up functions. IC Role / Device Role / Timing Role: Primary MCU executing CapSense® scanning, LED driver control, and Modbus RTU over UART. Use Value: Single-chip integration reduces BOM count by eliminating discrete touch controller and USB bridge IC. | Use Scenario: Center console touchpad supporting multi-finger gestures and haptic feedback coordination. IC Role / Device Role / Timing Role: CapSense® engine with mutual-capacitive scanning at 120 Hz and synchronized PWM output for piezo actuator drive. Use Value: Hardware-accelerated gesture engine achieves sub-15 ms latency without CPU load, meeting OEM responsiveness targets. |
| Medical Patient Monitor UI | Smart Home Appliance Keypad |
Use Scenario: Sterilizable front-panel interface with water-resistant overlay and glove-touch capability. IC Role / Device Role / Timing Role: CapSense® with shield electrode drive and adaptive noise filtering for EMI-rich hospital environments. Use Value: Configurable IDAC current and dual-slope ADC enable reliable operation under saline contamination and RF interference. | Use Scenario: Oven/microwave control panel with rotary encoder emulation and backlight dimming. IC Role / Device Role / Timing Role: Mixed-signal hub managing CapSense® buttons, thermal sensor ADC, and triac gate drive via UDB-generated zero-crossing PWM. Use Value: On-chip op-amps condition thermistor signals; UDBs generate phase-controlled AC drive without external timer IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable mixed-signal HMI applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C3866AXI-063 | Same PSoC™ 3 architecture but with 256 kB flash, 32 kB SRAM, and 128 I/O - larger memory and pin count | Suitable for designs requiring USB host capability or extensive firmware logging | Select when future firmware expansion headroom or additional CapSense® channels (>48) are needed |
| PSOC™ 4200DS (CY8C4247LQI-M485) | Arm® Cortex®-M0 core, 256 kB flash, 32 kB SRAM, but only 32 CapSense® channels and no USB device PHY | Lacks integrated USB PHY - requires external transceiver or USB-to-UART bridge for PC connectivity | Prefer for cost-sensitive, non-USB HMI where Arm ecosystem tooling is prioritized over legacy 8051 code reuse |
Compared with CY8C3666AXI-202, CY8C3866AXI-063 offers scalability for feature-rich HMI, while CY8C4247LQI-M485 trades USB integration and CapSense® density for Arm-based development flexibility and lower unit cost in high-volume production.
Availability
CY8C3666AXI-202 is available at Aetrix Electronics and suitable for industrial control panels, automotive cabin interfaces, medical patient monitors, and smart home appliance keypads requiring stable component supply and long-term manufacturability.
Supply support for CY8C3666AXI-202 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, automotive ICs, security solutions, and microcontrollers, with global R&D and manufacturing infrastructure.
The PSoC™ 3 product line was designed to deliver field-programmable analog and digital integration for cost-sensitive, high-mix HMI and sensor-processing applications where rapid prototyping and hardware flexibility are critical.
FAQ
What development tools are required to program CY8C3666AXI-202?
PSoC™ Creator™ IDE (v3.3 or later) is mandatory for configuring UDBs, CapSense® widgets, and analog routing. Programming requires MiniProg3 or KitProg2 programmer/debugger via SWD or JTAG. No third-party toolchain support is provided - all peripheral drivers and USB stacks are generated within Creator™.
Does CY8C3666AXI-202 support true hardware USB enumeration without CPU involvement?
Yes - the integrated USB 2.0 full-speed PHY and endpoint controller handle bus reset detection, descriptor requests, and packet ACK/NACK autonomously. The CPU only services endpoint interrupts after data transfer completion, enabling low-latency HID report updates.
Can CapSense® operate reliably in presence of 2.4 GHz Wi-Fi or Bluetooth interference?
Yes - the device supports spread-spectrum frequency hopping, shield electrode drive, and correlation-based noise rejection. Tested per IEC 61000-4-3 (radiated RF immunity) at 10 V/m, it maintains touch accuracy with <0.5% false-trigger rate under concurrent 2.4 GHz transmission.
Is there qualified automotive-grade packaging available for this part number?
No - CY8C3666AXI-202 is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. For automotive cabin applications, Infineon recommends CY8C3866AXI-063 with extended qualification testing or PSOC™ Automotive 4 series devices certified to AEC-Q100 Grade 2.
CY8C3666AXI-202 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 100-LQFP
- Series:
- PSOC™ 3 CY8C36xx
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 67MHz
- Connectivity:
- EBI/EMI, I2C, LINbus, SPI, UART/USART
- Peripherals:
- CapSense, DMA, LCD, POR, PWM, WDT
- Number of I/O:
- 62
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 8K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 5.5V
- Data Converters:
- A/D 16x12b; D/A 4x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
CY8C3666AXI-202 FAQ
1.How can I place an order for CY8C3666AXI-202 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C3666AXI-202 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 CY8C3666AXI-202 reliable?
The price and inventory of CY8C3666AXI-202 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C3666AXI-202 is usually 5 days.
3.What payment methods are accepted for CY8C3666AXI-202?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C3666AXI-202 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C3666AXI-202?
CY8C3666AXI-202 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C3666AXI-202 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 CY8C3666AXI-202?
For technical support, including CY8C3666AXI-202 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C3666AXI-202 requirements.
6.How does Aetrix verify that CY8C3666AXI-202 is sourced from the original manufacturer or authorized distributors?
All CY8C3666AXI-202 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 CY8C3666AXI-202 meets industry standards.
7.What is the process for return or replacement of CY8C3666AXI-202?
All CY8C3666AXI-202 units undergo pre-shipment inspection (PSI). If there is an issue with CY8C3666AXI-202, 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 CY8C3666AXI-202 part is unused and in its original packaging.
Return procedure for CY8C3666AXI-202:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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