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Infineon Technologies CY8C3666LTI-203
- Part No.:
- CY8C3666LTI-203
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 68-VFQFN Exposed Pad
- Datasheet:
-
CY8C3666LTI-203.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 68QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,300
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Product details
Overview
CY8C3666LTI-203 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 touch sensing. It supports up to 24 analog channels, includes a 12-bit SAR ADC, and operates at 67 MHz with industrial temperature range (–40°C to +85°C). Used in human-machine interface (HMI) modules for industrial control panels.
For engineers reviewing the CY8C3666LTI-203 datasheet, CY8C3666LTI-203 pinout, CY8C3666LTI-203 application, or CY8C3666LTI-203 equivalent, key selection criteria include CapSense® channel count, analog resource allocation, flash/SRAM balance, and QFN-68 package compatibility with high-density PCB layouts.
Technical Context
This device belongs to the PSoC™ 3 family built on a 8051-based architecture with configurable analog and digital blocks. It integrates a programmable analog subsystem (including op-amps, comparators, and transimpedance amplifiers) and a programmable digital subsystem (UDBs supporting state machines, PWMs, timers, and communication interfaces).
The chip supports multiple serial protocols including I²C, SPI, and UART via its Universal Digital Blocks, and features dedicated hardware for CapSense® with shield electrode support and noise immunity tuning. Its internal voltage regulator enables single-supply operation from 1.71 V to 5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | 8051-compatible, 67 MHz max - enables deterministic real-time control with legacy code portability. |
| Flash Memory | 64 KB - sufficient for complex HMI firmware with CapSense® tuning, communication stacks, and safety checks. |
| SRAM | 8 KB - supports multi-channel CapSense® baseline tracking, buffer storage for sensor data, and stack depth for nested interrupts. |
| Analog Channels | Up to 24 - allows simultaneous capacitive buttons, sliders, proximity detection, and analog sensor inputs (e.g., temp, voltage). |
| ADC Resolution | 12-bit SAR - provides adequate dynamic range for precision analog monitoring alongside touch sensing. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments without external thermal management. |
| Supply Voltage | 1.71 V to 5.5 V - simplifies power design by eliminating level shifters when interfacing with 3.3 V or 5 V peripherals. |
Pinout & Package
Package: 68-pin QFN (10 mm × 10 mm, 0.5 mm pitch), thermally enhanced with exposed pad for improved heat dissipation in compact industrial enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA/VSSA | Analog power/ground | Separate analog supply domain isolates sensitive CapSense® and ADC circuits from digital noise. |
| P0[0]–P0[7] | CapSense® I/O | Dedicated pins with integrated IDACs and CSD block routing - optimized for low-noise mutual/capacitive sensing. |
| P1[0]–P1[7] | Digital GPIO | Configurable as UART/SPI/I²C, PWM outputs, or interrupt-capable inputs for system control signaling. |
| XTAL1/XTAL2 | Crystal oscillator input/output | Supports 1–33 MHz crystal for precise timing of CapSense® scanning and communication baud rates. |
| SWDCK/SWDIO | Debug interface | Enables in-circuit programming and real-time debugging without dedicated JTAG header footprint. |
Key Features
| Feature | Design Value |
|---|---|
| CapSense® CSD v2.0 | Hardware-accelerated capacitive sensing engine with automatic baseline restoration and smart sensing algorithms. |
| Programmable Analog Blocks | Configurable op-amps, comparators, and TIA support analog front-end customization without external components. |
| Universal Digital Blocks (UDB) | Reconfigurable logic fabric enabling custom peripherals (e.g., encoder interface, custom protocol engines) in firmware. |
| Internal LDO Regulator | Single 1.71–5.5 V input powers both analog and digital domains - reduces external BOM count and layout complexity. |
| Capacitive Shield Support | Dedicated shield driver pins minimize EMI coupling and improve touch robustness in noisy industrial settings. |
Applications
| Industrial HMI Panels | Medical Device Touch Interfaces |
|---|---|
Use Scenario: Touch-enabled operator interface on PLC-mounted control terminals with metal bezel and glove operation. IC Role / Device Role / Timing Role: Primary MCU executing CapSense® scan, button/slider decoding, and RS-485 communication to host controller. Use Value: Integrated CapSense® eliminates external touch controller IC, reducing layer count and improving ESD resilience per IEC 61000-4-2 Level 4. | Use Scenario: Sterile-field touch controls on infusion pump front panel requiring wet-finger and glove responsiveness. IC Role / Device Role / Timing Role: Real-time capacitive sensing hub with adaptive thresholding and noise rejection during motor-driven actuation. Use Value: On-chip IDAC calibration and shield drive reduce false triggers from fluid ingress and electromagnetic interference from pump motors. |
| Automotive Cabin Controls | Home Appliance Control Boards |
Use Scenario: Non-backlit center console buttons and rotary encoders in entry-level vehicles with wide temperature cycling. IC Role / Device Role / Timing Role: Standalone touch processor handling proximity wake-up, multi-touch gesture decoding, and LIN bus reporting. Use Value: –40°C to +85°C qualification and internal voltage regulation ensure reliable operation across cabin thermal transients without external regulators. | Use Scenario: Wash-resistant touch panel on dishwasher control board exposed to steam and condensation. IC Role / Device Role / Timing Role: Capacitive sensing node managing water-resistant overlay compensation and self-test diagnostics. Use Value: Dedicated shield drive and SmartSense™ auto-tuning maintain sensitivity through dielectric changes caused by surface moisture films. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable mixed-signal microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C3866LTI-065 | Same PSoC™ 3 architecture, 128 KB flash, 16 KB SRAM, identical pinout - higher memory density. | Required for larger firmware images with Bluetooth LE stack integration or advanced GUI rendering. | Select when firmware growth exceeds 64 KB or dual-bank OTA updates are needed. |
| CY8C4247LTI-483 | PSoC™ 4 (ARM Cortex-M0), 256 KB flash, 32 KB SRAM, QFN-68 - newer architecture, no 8051 legacy dependency. | Better suited for new designs needing BLE connectivity, lower active power, or CMSIS-compliant toolchains. | Prefer for greenfield projects prioritizing long-term roadmap alignment over 8051 code reuse. |
Compared with CY8C3866LTI-065 and CY8C4247LTI-483, the CY8C3666LTI-203 offers optimal cost-performance balance for mature 8051-based HMI designs where memory headroom and ARM migration are not required.
Availability
CY8C3666LTI-203 is available at Aetrix Electronics and suitable for industrial HMI panels, medical device interfaces, automotive cabin controls, and home appliance control boards requiring stable component supply and long-lifecycle support.
Supply support for CY8C3666LTI-203 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 systems, automotive ICs, and secure microcontrollers, with global R&D and manufacturing infrastructure.
This part belongs to the PSoC™ 3 product line - designed specifically for cost-sensitive, high-integration embedded applications demanding flexible analog/digital reconfigurability without ARM licensing overhead.
FAQ
What development tools support CY8C3666LTI-203?
PSoC™ Creator IDE (v3.3 or later) fully supports this device, providing drag-and-drop component configuration for CapSense®, analog blocks, and digital peripherals. Programming is done via SWD using MiniProg3 or KitProg debug probes. No third-party toolchain licensing is required.
Does CY8C3666LTI-203 support hardware-accelerated encryption?
No - this PSoC™ 3 device lacks dedicated cryptographic accelerators. It supports software-based AES-128 via standard libraries, but does not include hardware TRNG, SHA, or RSA engines. For secure boot or key storage, external secure elements are recommended.
Can it drive a 16x2 character LCD directly?
Yes - its GPIOs support static or multiplexed LCD segment driving up to 4 commons and 24 segments using firmware-controlled timing. However, no dedicated LCD controller peripheral is present; contrast voltage must be generated externally or via DAC output.
Is there qualified automotive-grade packaging available for this part?
No - CY8C3666LTI-203 is rated for industrial temperature range only (–40°C to +85°C). Infineon's automotive-qualified equivalents (e.g., CY8C3866AXI-065) use AEC-Q100 qualified packaging and screening, but differ in part number, marking, and test documentation.
CY8C3666LTI-203 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 68-VFQFN Exposed Pad
- Series:
- PSOC™ 3 CY8C36xx
- Packaging:
- Tray
- 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-203 FAQ
1.How can I place an order for CY8C3666LTI-203 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C3666LTI-203 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-203 reliable?
The price and inventory of CY8C3666LTI-203 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C3666LTI-203 is usually 5 days.
3.What payment methods are accepted for CY8C3666LTI-203?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C3666LTI-203 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C3666LTI-203?
CY8C3666LTI-203 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C3666LTI-203 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-203?
For technical support, including CY8C3666LTI-203 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C3666LTI-203 requirements.
6.How does Aetrix verify that CY8C3666LTI-203 is sourced from the original manufacturer or authorized distributors?
All CY8C3666LTI-203 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-203 meets industry standards.
7.What is the process for return or replacement of CY8C3666LTI-203?
All CY8C3666LTI-203 units undergo pre-shipment inspection (PSI). If there is an issue with CY8C3666LTI-203, 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-203 part is unused and in its original packaging.
Return procedure for CY8C3666LTI-203:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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