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Infineon Technologies CY8C3666AXI-037T
- Part No.:
- CY8C3666AXI-037T
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
CY8C3666AXI-037T.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,827
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Product details
Overview
CY8C3666AXI-037T from Infineon Technologies is a PSoC™ 3 programmable system-on-chip featuring an 8051 CPU core, 64 KB flash memory, 8 KB SRAM, and integrated CapSense™ capacitive sensing, analog (12-bit SAR ADC, op-amps, comparators), and digital (PLD-based UDBs) peripherals. It operates at up to 67 MHz and supports USB 2.0 full-speed device functionality with on-chip transceiver. Used in human-interface devices such as touch-enabled industrial HMI panels and medical control interfaces.
For engineers reviewing the CY8C3666AXI-037T datasheet, CY8C3666AXI-037T pinout, CY8C3666AXI-037T application, or CY8C3666AXI-037T equivalent, key selection criteria include USB-capable PSoC 3 architecture, CapSense™ integration for robust touch sensing, configurable analog/digital blocks, 67 MHz operation speed, and QFN-68 package compatibility with industrial layout constraints.
Technical Context
The CY8C3666AXI-037T implements a single-cycle 8051 CPU core with hardware multiplier and debug interface, enabling deterministic real-time control. Its Universal Digital Blocks (UDBs) provide reconfigurable logic for custom state machines, PWM generators, or communication protocols without firmware overhead.
Analog subsystem includes a 12-bit SAR ADC with up to 1 Msps sampling rate, four rail-to-rail op-amps, two comparators, and programmable IDACs - all directly routable to CapSense™ electrodes or external sensors. USB 2.0 full-speed PHY is embedded with internal termination and voltage regulator, eliminating external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Single-cycle 8051 with hardware multiplier; enables deterministic real-time control loops and fast interrupt response. |
| Flash / SRAM | 64 KB flash (with EEPROM emulation) and 8 KB SRAM; supports field firmware updates and data logging without external memory. |
| CapSense™ Channels | Up to 64 self- or mutual-capacitance channels; enables multi-touch sliders, proximity detection, and water-tolerant UIs. |
| ADC Resolution/Speed | 12-bit SAR ADC, 1 Msps max; sufficient for precision sensor signal acquisition (e.g., temperature, pressure) with oversampling support. |
| USB Interface | Integrated USB 2.0 full-speed PHY + controller; eliminates external transceiver and reduces BOM cost and PCB area. |
| Operating Voltage | 1.71 V to 5.5 V supply range; allows direct interfacing with 3.3 V or 5 V systems and battery-powered operation down to 1.71 V. |
| Max Clock Frequency | 67 MHz internal main oscillator; delivers high throughput for mixed-signal processing and USB transaction handling. |
Pinout & Package
Package: 68-pin QFN (10 mm × 10 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad. RoHS-compliant, lead-free, and qualified for industrial temperature range (–40 °C to +85 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0[0]–P0[7] | General-purpose I/O with CapSense™, analog input, or USB D+ | Configurable as GPIO, analog input, or dedicated USB D+ line; supports simultaneous CapSense™ and analog sensing on same pins. |
| P1[0]–P1[7] | General-purpose I/O with analog output, comparator, or IDAC | Supports programmable current sources (IDAC) for sensor biasing or LED drive; includes comparator inputs for threshold detection. |
| USB_DP / USB_DM | USB 2.0 differential data pair | Dedicated full-speed USB PHY pins with internal 1.5 kΩ pull-up on D+; no external resistors required for device enumeration. |
| VDDA / VSSA | Analog power and ground | Separate analog supply domain isolates noise-sensitive ADC and CapSense™ circuits from digital switching noise. |
| XRES | External reset input (active-low) | Asynchronous reset pin compatible with open-drain or push-pull reset sources; debounced internally for reliable startup. |
Key Features
| Feature | Design Value |
|---|---|
| CapSense™ CSD v3.0 | Supports button/slider/proximity with automatic baseline tracking and noise immunity up to ±20 V common-mode noise. |
| Programmable Analog Blocks | Four op-amps configurable as PGA, filter, or sensor interface; two comparators with hysteresis and internal reference. |
| Universal Digital Blocks (UDB) | Eight UDBs enable custom logic (e.g., SPI slave, quadrature decoder, PWM with dead-time) without CPU intervention. |
| USB 2.0 Full-Speed Device | On-die PHY, endpoint buffers, and descriptor engine reduce host-side driver complexity and eliminate external transceiver. |
| Low-Power Modes | Five power modes including Hibernate (200 nA), Stop (1.2 µA), and Sleep (25 µA); extends battery life in portable HMI. |
Applications
| Industrial HMI Panel | Medical Device Control Interface |
|---|---|
|
Use Scenario: Touchscreen overlay on sealed front panel of PLC operator terminal requiring ESD-hardened, glove-compatible interaction. IC Role / Device Role / Timing Role: Primary system controller executing CapSense™ scan, analog sensor readout, and USB HID report generation. Use Value: Single-chip integration eliminates separate touch controller and USB bridge IC, reducing layer count and improving EMC robustness. |
Use Scenario: Bedside monitor with capacitive touch buttons and rotary slider for parameter adjustment in noisy clinical environments. IC Role / Device Role / Timing Role: Real-time CapSense™ processing with adaptive noise rejection and USB CDC communication to host PC. Use Value: Built-in CapSense™ CSD v3.0 achieves >99% touch accuracy under 10 kV ESD discharge per IEC 61000-4-2 Level 4. |
| Automotive Cabin Control | Smart Home Appliance Interface |
|
Use Scenario: Climate control panel with backlight dimming, touch feedback, and LIN bus coordination in passenger compartment. IC Role / Device Role / Timing Role: CapSense™ coordinator and LIN physical layer interface via GPIO-configured UART with LIN transceiver. Use Value: 67 MHz CPU handles concurrent CapSense™ scanning, PWM backlight control, and LIN message scheduling without jitter. |
Use Scenario: Oven control panel with water-resistant touch keys and temperature sensor interface in humid kitchen environment. IC Role / Device Role / Timing Role: Analog front-end for NTC thermistor measurement and CapSense™ for wet-finger detection. Use Value: Integrated 12-bit ADC with programmable gain amplifier enables direct NTC reading with <±0.5°C accuracy over 0–150°C range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable mixed-signal MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C3866AXI-037T | Same package and pinout; adds 16 KB additional flash and 2 KB additional SRAM; identical peripheral set. | Suitable for firmware-intensive applications requiring larger code space or extended data buffering. | Select when future firmware growth or complex USB descriptors exceed 64 KB flash capacity. |
| CY8C4247LQI-M485 | ARM Cortex-M0+ core, 256 KB flash, 32 KB SRAM, same CapSense™ and USB capability; QFN-68 package. | Higher performance, richer toolchain support, and longer roadmap; requires ARM toolchain migration. | Choose for new designs prioritizing long-term scalability, RTOS support, and ecosystem maturity over legacy 8051 familiarity. |
Compared with CY8C3666AXI-037T, the CY8C3866AXI-037T offers headroom for firmware expansion without changing layout, while the CY8C4247LQI-M485 provides architectural modernization and higher throughput at the cost of toolchain transition and increased power in active mode.
Availability
CY8C3666AXI-037T is available at Aetrix Electronics and suitable for industrial HMI, medical device control, automotive cabin interfaces, and smart appliance interfaces requiring stable component supply across multi-year production cycles.
Supply support for CY8C3666AXI-037T 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, and embedded controllers, with global manufacturing and quality certifications including ISO/TS 16949 and AEC-Q200.
This device belongs to the PSoC™ 3 family - a programmable mixed-signal platform designed for rapid development of differentiated human-interface and sensor-processing applications in industrial and medical markets.
FAQ
Does CY8C3666AXI-037T support USB host functionality?
No. The CY8C3666AXI-037T integrates only a USB 2.0 full-speed device controller with embedded PHY. It cannot act as a USB host or support USB On-The-Go. Host capability requires external USB host controller ICs or migration to PSoC™ 4/6 families with dual-role support.
Can CapSense™ operate reliably with thick glass overlays?
Yes. With proper electrode design and tuning, CapSense™ CSD v3.0 on this device supports up to 10 mm glass thickness. Sensitivity is adjustable via firmware parameters including scan resolution, IDAC current, and averaging; typical SNR exceeds 50:1 even with 8 mm cover lens.
What debug interfaces are available?
The device supports SWD (Serial Wire Debug) via dedicated P1[6]/P1[7] pins and full-speed JTAG via P0[0]–P0[3]. Both interfaces enable real-time debugging, flash programming, and boundary-scan testing using standard tools like Cypress Programmer or Segger J-Link.
Is there hardware support for LIN communication?
No dedicated LIN transceiver or protocol engine is integrated. However, LIN 2.2 physical layer compliance can be achieved using GPIO-configured UART with external LIN transceiver (e.g., TLE7259), and protocol stack execution is supported by the 67 MHz CPU and timer resources.
CY8C3666AXI-037T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 100-LQFP
- Series:
- PSOC™ 3 CY8C36xx
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 67MHz
- Connectivity:
- CANbus, 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-037T FAQ
1.How can I place an order for CY8C3666AXI-037T through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C3666AXI-037T 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-037T reliable?
The price and inventory of CY8C3666AXI-037T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C3666AXI-037T is usually 5 days.
3.What payment methods are accepted for CY8C3666AXI-037T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C3666AXI-037T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C3666AXI-037T?
CY8C3666AXI-037T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C3666AXI-037T 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-037T?
For technical support, including CY8C3666AXI-037T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C3666AXI-037T requirements.
6.How does Aetrix verify that CY8C3666AXI-037T is sourced from the original manufacturer or authorized distributors?
All CY8C3666AXI-037T 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-037T meets industry standards.
7.What is the process for return or replacement of CY8C3666AXI-037T?
All CY8C3666AXI-037T units undergo pre-shipment inspection (PSI). If there is an issue with CY8C3666AXI-037T, 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-037T part is unused and in its original packaging.
Return procedure for CY8C3666AXI-037T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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