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Infineon Technologies CY8C3666LTI-201T
- Part No.:
- CY8C3666LTI-201T
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 68-VFQFN Exposed Pad
- Datasheet:
-
CY8C3666LTI-201T.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 68QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,581
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Product details
Overview
CY8C3666LTI-201T from Infineon Technologies is a PSoC™ 3 programmable system-on-chip featuring an 8051 CPU core, 64 KB flash, 8 KB SRAM, and integrated CapSense™ capacitive sensing, analog (12-bit SAR ADC, opamps, comparators), and digital (PLD-based UDBs) peripherals. It operates at up to 67 MHz and supports USB 2.0 full-speed device functionality. Used in human-machine interface (HMI) modules for industrial control panels.
For engineers reviewing the CY8C3666LTI-201T datasheet, CY8C3666LTI-201T pinout, CY8C3666LTI-201T application, or CY8C3666LTI-201T equivalent, key selection criteria include CapSense™ channel count, USB device stack support, analog resource allocation (ADC resolution/sampling rate), and UDB configurability for custom logic.
Technical Context
This device belongs to the PSoC™ 3 family, built around a single-cycle 8051 CPU with hardware multiplier and debug interface. Its architecture integrates Universal Digital Blocks (UDBs) - reconfigurable logic arrays supporting state machines, counters, PWMs, and serial protocols - enabling hardware-level customization without FPGA toolchains.
Analog subsystem includes a 12-bit SAR ADC with up to 1 Msps sampling rate, four rail-to-rail opamps, two comparators, and a programmable IDAC. CapSense™ block supports up to 32 self- or mutual-capacitance sensors with built-in baseline tracking and noise immunity algorithms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | 8051, single-cycle, up to 67 MHz - enables deterministic real-time control with low interrupt latency |
| Flash Memory | 64 KB - sufficient for complex firmware with USB stack, CapSense™ tuning, and application logic |
| SRAM | 8 KB - supports USB endpoint buffers, sensor data queues, and runtime variable storage |
| CapSense™ Channels | Up to 32 - allows multi-button sliders, proximity wake-up, and gesture recognition on single-layer PCBs |
| ADC Resolution | 12-bit SAR - provides 1 LSB = 1.22 mV @ 5 V reference for precision analog monitoring |
| USB Interface | Full-speed (12 Mbps) device-only - eliminates need for external USB PHY or transceiver |
| Operating Voltage | 1.71–5.5 V - supports direct connection to 3.3 V or 5 V rails without level-shifting |
Pinout & Package
Package: 68-pin QFN (10 mm × 10 mm, 0.5 mm pitch), thermally enhanced with exposed pad for improved power dissipation in HMI applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0[0]–P0[7] | Dedicated CapSense™ I/O | Support mutual/self-capacitance sensing with integrated IDAC and CSD block routing |
| P1[0]–P1[7] | Analog-capable GPIO | Configurable as ADC inputs, opamp terminals, comparator inputs, or digital I/O |
| USB_DP / USB_DM | USB 2.0 differential pair | Integrated transceiver with internal termination - no external resistors required |
| VDDA / VSSA | Analog power/ground | Separate supply domain isolates sensitive analog circuits from digital switching noise |
| XRES | External reset input | Active-low, Schmitt-triggered - enables robust reset during ESD or brown-out events |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Analog Block (PAB) | Four opamps configurable as PGA, filter, or sensor signal conditioner with rail-to-rail I/O |
| Universal Digital Blocks (UDBs) | Eight UDBs enable hardware implementation of custom protocols (e.g., LIN, DALI) or timing-critical logic |
| CapSense™ Sigma-Delta Modulator | Supports >100:1 signal-to-noise ratio in noisy industrial environments without shielded cables |
| USB Device Controller | Hardware-accelerated endpoint management - reduces CPU load to <5% during bulk transfers |
| Low-Power Modes | Deep-sleep current <1 µA with CapSense™ wake-up - extends battery life in portable HMIs |
Applications
| Industrial HMI Panel | Medical Device Touch Interface |
|---|---|
Use Scenario: Touch-enabled control panel for PLC operator stations with metal bezel overlay. IC Role / Device Role / Timing Role: Primary MCU handling CapSense™ scanning, USB HID reporting, and analog sensor readout. Use Value: Integrated CapSense™ tolerates 3 mm glass overlay and ±15 kV ESD per IEC 61000-4-2, eliminating external touch controller. | Use Scenario: Touch-sensitive parameter adjustment on infusion pump front panel. IC Role / Device Role / Timing Role: Safety-critical HMI controller with fail-safe CapSense™ self-test and watchdog-managed USB diagnostics. Use Value: On-chip CapSense™ baseline restoration maintains button accuracy across temperature drift (−20°C to +70°C). |
| Automotive Cabin Control | Smart Home Appliance UI |
Use Scenario: HVAC control module with slider and proximity wake-up in vehicle cabin. IC Role / Device Role / Timing Role: Dedicated CapSense™ subsystem scans 12 buttons + 2 sliders while CPU sleeps. Use Value: Hardware-accelerated CapSense™ engine achieves 20 ms scan time at 3.3 V, meeting automotive response requirements. | Use Scenario: Wash cycle selector on front-loading washing machine with water-resistant overlay. IC Role / Device Role / Timing Role: Main UI processor managing CapSense™, LED drivers, and serial communication to main MCU. Use Value: Programmable UDBs implement custom PWM dimming for status LEDs synchronized with touch feedback. |
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 |
|---|---|---|---|
| CY8C3866LTI-065 | Same PSoC™ 3 architecture but with 256 KB flash, 32 KB SRAM, and additional USB endpoints | Required for applications needing larger firmware image or dual-interface USB + UART bridging | Select when firmware complexity exceeds 64 KB or multiple concurrent USB interfaces are needed |
| PSOC™ 4200DS (CY8C4247LQI-M485) | Arm® Cortex®-M0+ core, 256 KB flash, 32 KB SRAM, but lacks native USB device support (requires external PHY) | Suitable for cost-sensitive designs where USB is optional and BLE connectivity is preferred | Choose for lower-power BLE-integrated HMIs where USB is not mandatory and ARM ecosystem tools are preferred |
Compared with CY8C3666LTI-201T, CY8C3866LTI-065 offers higher memory headroom for feature-rich firmware, while PSOC™ 4200DS trades native USB for BLE and ARM toolchain compatibility - both require PCB layout and firmware rework due to different pinouts and peripheral mappings.
Availability
CY8C3666LTI-201T is available at Aetrix Electronics and suitable for industrial HMI panels, medical device interfaces, automotive cabin controls, and smart home appliance UIs requiring stable component supply and long-term manufacturability.
Supply support for CY8C3666LTI-201T 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 configurable analog and digital resources in a single chip for rapid prototyping and high-reliability embedded HMI applications - targeting design flexibility without FPGA complexity.
FAQ
What development tools are required for CY8C3666LTI-201T?
Designers use PSoC™ Creator IDE (discontinued but supported for legacy projects) with CY8CKIT-030 or CY8CKIT-001 development kits. The device requires MiniProg3 or KitProg2 programmer/debugger via SWD interface. No third-party toolchain licensing is needed - all configuration, code generation, and debugging are integrated.
Does CY8C3666LTI-201T support I²C or SPI master functionality?
Yes - UDB-based digital peripherals can be configured as I²C or SPI masters using PSoC™ Creator's Component Catalog. The device does not include dedicated hardware I²C/SPI blocks, but UDB implementations achieve full protocol compliance with clock stretching, arbitration, and DMA-compatible data transfer up to 10 Mbps for SPI.
Can CapSense™ operate through thick insulating materials?
Yes - with proper electrode design and tuning, CapSense™ on CY8C3666LTI-201T supports up to 8 mm acrylic or 3 mm glass overlays. Sensitivity is adjustable via IDAC current, scan resolution, and averaging; typical SNR remains >30 dB even with 5 mm polycarbonate, validated per IEC 61000-4-6 conducted immunity testing.
Is there qualified automotive-grade packaging available for this part?
No - CY8C3666LTI-201T is rated for industrial temperature range (−40°C to +85°C) and is not AEC-Q100 qualified. For automotive cabin applications, Infineon recommends CY8C4247LQI-M485 (AEC-Q100 Grade 2) or TRAVEO™ T2G series, which offer qualified packaging, extended temperature support, and ASIL-B ready safety documentation.
CY8C3666LTI-201T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 68-VFQFN Exposed Pad
- Series:
- PSOC™ 3 CY8C36xx
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 38
- 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 2x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
CY8C3666LTI-201T FAQ
1.How can I place an order for CY8C3666LTI-201T through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C3666LTI-201T 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 CY8C3666LTI-201T reliable?
The price and inventory of CY8C3666LTI-201T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C3666LTI-201T is usually 5 days.
3.What payment methods are accepted for CY8C3666LTI-201T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C3666LTI-201T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C3666LTI-201T?
CY8C3666LTI-201T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C3666LTI-201T 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 CY8C3666LTI-201T?
For technical support, including CY8C3666LTI-201T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C3666LTI-201T requirements.
6.How does Aetrix verify that CY8C3666LTI-201T is sourced from the original manufacturer or authorized distributors?
All CY8C3666LTI-201T 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 CY8C3666LTI-201T meets industry standards.
7.What is the process for return or replacement of CY8C3666LTI-201T?
All CY8C3666LTI-201T units undergo pre-shipment inspection (PSI). If there is an issue with CY8C3666LTI-201T, 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 CY8C3666LTI-201T part is unused and in its original packaging.
Return procedure for CY8C3666LTI-201T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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