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Infineon Technologies CY8C3666LTI-203T
- Part No.:
- CY8C3666LTI-203T
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 68-VFQFN Exposed Pad
- Datasheet:
-
CY8C3666LTI-203T.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 68QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,905
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Product details
Overview
CY8C3666LTI-203T from Infineon 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 front-end (12-bit SAR ADC, op-amps, comparators), and programmable digital blocks (UDBs). 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-203T datasheet, CY8C3666LTI-203T pinout, CY8C3666LTI-203T application, or CY8C3666LTI-203T equivalent, key selection criteria include CapSense™ channel count, USB device stack support, analog resource allocation, and QFN-68 package thermal performance in space-constrained HMI designs.
Technical Context
This device belongs to the PSoC™ 3 family, built on a flexible mixed-signal architecture where analog and digital resources are configured via hardware description language (HDL) and firmware. It integrates a dedicated USB 2.0 full-speed PHY with endpoint buffers and supports descriptor-based enumeration without external transceivers.
The CapSense™ subsystem uses mutual-capacitance scanning across up to 32 sensors with baseline tracking and noise immunity algorithms. Analog resources include four op-amps (rail-to-rail I/O, gain-bandwidth product ≥ 5 MHz), two 12-bit SAR ADCs (1 Msps max, programmable input mux), and two 8-bit DACs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | 8051-compatible, 67 MHz max - enables deterministic real-time control with cycle-accurate timing for sensor polling and USB ISR handling. |
| Flash Memory | 64 KB - sufficient for dual-application firmware images with bootloader and CapSense™ tuning libraries. |
| SRAM | 8 KB - supports simultaneous USB endpoint buffering, CapSense™ raw data storage, and application state variables. |
| CapSense™ Channels | Up to 32 - allows multi-touch slider, proximity wake-up, and button matrix in single-chip HMI solutions. |
| USB Interface | Full-speed (12 Mbps), integrated PHY - eliminates external transceiver, reduces BOM cost and PCB area for HID-class devices. |
| Analog Peripherals | 2× 12-bit SAR ADC (1 Msps), 4× op-amps, 2× 8-bit DAC - enables closed-loop analog signal conditioning and sensor calibration without external ICs. |
| Package | 68-pin QFN (10 mm × 10 mm, 0.5 mm pitch) - provides thermal pad for power dissipation in continuous CapSense™ scan operation. |
Pinout & Package
The CY8C3666LTI-203T is housed in a 68-pin QFN package with exposed thermal pad (EP), designed for reflow soldering and thermal management in compact industrial enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core & I/O supply | 3.3 V ±10% input; powers all digital logic, analog blocks, and USB PHY - requires local 10 µF + 100 nF decoupling. |
| VSS | Digital ground | Reference return for digital circuits; must be connected to EP for low-impedance thermal and signal path. |
| USB_DP / USB_DM | USB differential pair | Direct connection to USB connector; internal 1.5 kΩ pull-up on DP enables full-speed device enumeration. |
| P0[0]–P0[7] | General-purpose I/O | Configurable as CapSense™ CSD or CSX electrodes, analog inputs, or digital GPIO with programmable drive strength. |
| XTAL_IN / XTAL_OUT | Crystal oscillator terminals | Supports 1–33 MHz crystal; required for precise USB timing and high-accuracy CapSense™ scanning clock. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Analog Blocks | Four op-amps configurable as PGA, filter, or comparator - eliminates need for external signal-conditioning ICs in sensor front-ends. |
| CapSense™ Smart Sensing | Hardware-accelerated mutual-capacitance scanning with automatic baseline restoration - enables robust touch detection under ESD and moisture. |
| USB 2.0 Full-Speed Device | On-die PHY and endpoint FIFOs - supports HID, CDC, and vendor-specific classes without external silicon or firmware USB stack licensing. |
| Universal Digital Blocks (UDB) | Eight UDBs with PLD and datapath elements - implement custom PWM generators, UARTs, or protocol engines independent of CPU load. |
| Low-Power Modes | Deep-sleep mode with 1 µA typical current and wake-on-CapSense™ - extends battery life in portable industrial handhelds. |
Applications
| Industrial HMI Panel | Medical Device Touch Interface |
|---|---|
Use Scenario: Operator-facing control panel in PLC cabinets with sealed membrane overlay and glove operation. IC Role / Device Role / Timing Role: Primary MCU executing CapSense™ scan, USB HID reporting, and LED status feedback via programmable digital blocks. Use Value: Single-chip integration reduces component count by >12 parts versus discrete MCU + touch controller + USB transceiver solution. | Use Scenario: Touch-sensitive parameter adjustment on infusion pump front bezel requiring IEC 60601-1 compliance. IC Role / Device Role / Timing Role: Safety-critical HMI controller with CapSense™ noise rejection, isolated USB diagnostics port, and fail-safe deep-sleep entry on timeout. Use Value: Built-in CapSense™ baseline tracking maintains accuracy across temperature drift and electrode contamination per medical EMC standards. |
| Automotive Cabin Control | Smart Home Appliance Interface |
Use Scenario: Climate control panel in passenger compartment with ambient light compensation and haptic feedback. IC Role / Device Role / Timing Role: Real-time sensor fusion hub combining CapSense™, ambient light ADC, and PWM-driven LED drivers. Use Value: On-chip op-amps condition photodiode signals directly, avoiding external amplifiers and reducing layout sensitivity to EMI. | Use Scenario: Wash cycle selector dial and start button on front-loading washing machine with water-resistant overlay. IC Role / Device Role / Timing Role: Standalone touch controller interfacing to main MCU via I²C, with autonomous CapSense™ scanning during sleep. Use Value: Deep-sleep current <1 µA enables always-on touch wake-up while meeting Energy Star standby power requirements. |
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 |
|---|---|---|---|
| CY8C3866LTI-065 | Same PSoC™ 3 architecture but with 256 KB flash, 32 KB SRAM, and additional USB endpoints - no CapSense™ performance improvement. | Targeted at complex USB composite devices (e.g., HID + CDC + MSC); over-spec'd for basic touch-only HMI. | Select when firmware size exceeds 64 KB or multiple concurrent USB interfaces are required. |
| PSOC™ 4200 (CY8C4247LQI-M485) | Arm® Cortex®-M0 core, 256 KB flash, 32 KB SRAM, CapSense™ v3.0 - higher CapSense™ SNR and lower power, but no native USB PHY. | Requires external USB transceiver and more complex firmware stack; better suited for battery-powered IoT edge nodes. | Select for new designs prioritizing ultra-low-power CapSense™ and Arm ecosystem tooling over USB integration simplicity. |
Compared with CY8C3866LTI-065 and CY8C4247LQI-M485, the CY8C3666LTI-203T offers optimal balance of USB integration, CapSense™ channel density, and memory footprint for cost-sensitive industrial HMI - eliminating transceivers while retaining sufficient resources for real-time touch + USB HID operation.
Availability
CY8C3666LTI-203T is available at Aetrix Electronics and suitable for industrial HMI panels, medical device interfaces, automotive cabin controls, and smart home appliance touch modules requiring stable component supply and long-term manufacturability.
Supply support for CY8C3666LTI-203T 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 security solutions, with global R&D and manufacturing infrastructure.
The PSoC™ 3 product line was engineered to unify analog, digital, and programmable interconnect resources in a single chip for rapid development of differentiated HMI and sensor-processing applications - targeting design cycles under 12 weeks.
FAQ
Does CY8C3666LTI-203T support USB host functionality?
No. This device implements only USB 2.0 full-speed device mode with integrated PHY and endpoint buffers. It cannot act as a USB host or OTG controller. Host capability requires external USB host controller ICs or migration to PSoC™ 6 series with dual-core architecture.
What is the maximum operating temperature for continuous CapSense™ scanning?
The CY8C3666LTI-203T is rated for industrial temperature range (–40°C to +85°C). Continuous CapSense™ scanning at 100 Hz with all 32 electrodes active draws ≤2.1 mA at 3.3 V, resulting in junction temperature rise <12°C above ambient in standard QFN layout - well within thermal limits.
Can the on-chip op-amps drive a 50 Ω coaxial cable for analog sensor output?
No. The op-amps are optimized for on-die signal conditioning (e.g., PGA, filter) with rail-to-rail output swing but limited to 25 mA short-circuit current. Driving 50 Ω loads requires external high-current buffer amplifiers such as the TLE2141 or OPA549.
Is there hardware support for AES encryption in CY8C3666LTI-203T?
No. This PSoC™ 3 variant lacks dedicated cryptographic accelerators. AES operations must be implemented in firmware using ROM-based library functions. For hardware-accelerated crypto, consider PSoC™ 6 devices with CryptoBlock or OPTIGA™ secure elements.
CY8C3666LTI-203T 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 4x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
CY8C3666LTI-203T FAQ
1.How can I place an order for CY8C3666LTI-203T through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C3666LTI-203T 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-203T reliable?
The price and inventory of CY8C3666LTI-203T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C3666LTI-203T is usually 5 days.
3.What payment methods are accepted for CY8C3666LTI-203T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C3666LTI-203T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C3666LTI-203T?
CY8C3666LTI-203T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C3666LTI-203T 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-203T?
For technical support, including CY8C3666LTI-203T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C3666LTI-203T requirements.
6.How does Aetrix verify that CY8C3666LTI-203T is sourced from the original manufacturer or authorized distributors?
All CY8C3666LTI-203T 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-203T meets industry standards.
7.What is the process for return or replacement of CY8C3666LTI-203T?
All CY8C3666LTI-203T units undergo pre-shipment inspection (PSI). If there is an issue with CY8C3666LTI-203T, 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-203T part is unused and in its original packaging.
Return procedure for CY8C3666LTI-203T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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