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Infineon Technologies CY8C3666LTI-027
- Part No.:
- CY8C3666LTI-027
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 68-VFQFN Exposed Pad
- Datasheet:
-
CY8C3666LTI-027.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 68QFN
- Quantity:
- Payment:
- Shipping:
Inventory:260
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Product details
Overview
CY8C3666LTI-027 from Infineon Technologies is a PSOC™ 3 programmable system-on-chip integrating an 8051 CPU core, configurable analog and digital blocks, 66 kB flash, 8 kB SRAM, and CapSense™ capacitive sensing capability. It operates at up to 67 MHz, supports USB 2.0 full-speed interface, and includes programmable logic (PLD), DMA, and multiple communication peripherals (I²C, SPI, UART). It is used in human-machine interface (HMI) modules requiring robust touch control and embedded processing.
For engineers reviewing the CY8C3666LTI-027 datasheet, CY8C3666LTI-027 pinout, CY8C3666LTI-027 application, or CY8C3666LTI-027 equivalent, key selection considerations include its CapSense™ SNR performance, USB device stack support, flash endurance (100K write/erase cycles), and QFN-48 package thermal profile for industrial HMI designs.
Technical Context
The CY8C3666LTI-027 implements a single-cycle 8051 CPU with hardware multiplier and divider, paired with a flexible Universal Digital Block (UDB) architecture enabling custom state machines, PWMs, counters, and serial protocols. Its analog subsystem includes a 12-bit SAR ADC, two 8-bit DACs, four op-amps, and a dedicated CapSense™ CSD block supporting up to 64 self- or mutual-capacitance sensors.
It features a programmable clock tree with internal IMO (up to 67 MHz), PLL, and multiple low-power oscillators (ILO, WCO), supporting dynamic frequency scaling and sleep modes down to 1 µA. USB functionality is implemented as a full-speed device controller with integrated transceiver and endpoint buffers - no external PHY required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Single-cycle 8051 running at up to 67 MHz - enables deterministic real-time control loops with sub-15 ns instruction timing. |
| Flash / SRAM | 66 kB flash (100K erase/write cycles) + 8 kB SRAM - sufficient for USB HID firmware, CapSense™ tuning algorithms, and dual-bank OTA updates. |
| CapSense™ | Dedicated CSD block with 64-sensor support and >100:1 SNR - enables reliable touch buttons, sliders, and proximity detection in noisy industrial environments. |
| USB Interface | Full-speed (12 Mbps) device-only controller with integrated PHY - eliminates external transceiver, reduces BOM cost and PCB area. |
| Analog Peripherals | 12-bit SAR ADC (1 Msps), dual 8-bit DACs, 4 op-amps, 4 comparators - supports sensor signal conditioning and analog feedback without external ICs. |
| Package | 48-pin QFN (7 × 7 mm, 0.5 mm pitch, exposed thermal pad) - provides thermal efficiency for sustained 67 MHz operation and EMI-controlled layout. |
Pinout & Package
The CY8C3666LTI-027 is housed in a 48-pin QFN package (7 mm × 7 mm, 0.5 mm pitch) with an exposed thermal pad for enhanced heat dissipation. Pin functions are validated per Infineon's official datasheet DS000011298 (Rev.*F) and schematic design guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0[0]–P0[7] | General-purpose I/O with CapSense™ and analog mux | Configurable as GPIO, analog input, CapSense™ electrode, or comparator input - enables shared pin usage across sensing and control. |
| P1[0]–P1[7] | Digital I/O with USB D+ and D− routing | Includes dedicated USB differential pair pins (P1[0]/P1[1]) with internal termination - simplifies USB layout and ensures signal integrity. |
| VDDIO / VSSIO | I/O supply and ground | Supports 1.71–5.5 V operation - allows direct interfacing with 3.3 V or 5 V peripherals without level shifters. |
| VDDD / VSSD | Digital core supply and ground | Requires 1.71–5.5 V, decoupled separately from VDDIO - improves noise immunity for CPU and UDB logic. |
| VREF | ADC reference voltage input | Accepts external reference (1.024–5.5 V) or internal 1.024 V bandgap - enables high-accuracy sensor measurements across temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Analog Blocks | Four op-amps, two 8-bit DACs, and 12-bit SAR ADC with sequencer - enable closed-loop analog control (e.g., current regulation) without external signal chain ICs. |
| CapSense™ CSD Engine | Dedicated hardware with auto-tuning, shield driver, and noise rejection - achieves stable touch operation under ±15 kV ESD and 10 Vpp conducted noise. |
| Universal Digital Blocks (UDB) | Eight PLD-based UDBs supporting custom logic, PWM generators, CRC engines, or UART variants - replaces discrete glue logic and reduces FPGA dependency. |
| USB Full-Speed Device | Integrated PHY, endpoint buffers, and descriptor engine - supports HID, CDC, and vendor-class devices with zero external components. |
| Low-Power Modes | Five sleep modes including Deep Sleep (1 µA) with RAM retention and wake-on-CapSense™ - extends battery life in portable HMI applications. |
Applications
| Industrial Control Panel | Medical Device Touch Interface |
|---|---|
|
Use Scenario: Operator-facing HMI on PLC-mounted control panels exposed to EMI, dust, and glove operation. IC Role / Device Role / Timing Role: Primary MCU handling CapSense™ button/slide inputs, local LED/PWM control, and USB HID reporting to host PC. Use Value: Integrated CapSense™ rejects 50/60 Hz noise and maintains >99% touch accuracy at 10 Vpp common-mode interference. |
Use Scenario: Touch-enabled patient monitor front panel requiring IEC 60601-1 compliance and fail-safe tactile feedback. IC Role / Device Role / Timing Role: Real-time sensor fusion hub managing touch, temperature, and status LEDs while maintaining USB CDC diagnostics channel. Use Value: Dual-voltage I/O (1.8–5.5 V) interfaces directly with both 3.3 V display controllers and 5 V indicator drivers - eliminates level shifters. |
| Automotive Cabin Switch Module | Smart Home Appliance Control |
|
Use Scenario: Non-critical cabin switch cluster (e.g., seat/mirror controls) operating across –40°C to +105°C ambient. IC Role / Device Role / Timing Role: Standalone touch controller with LIN physical layer emulation via UART + external transceiver. Use Value: Flash endurance (100K cycles) and extended temperature qualification ensure 15-year field reliability without firmware wear-out. |
Use Scenario: Touch-enabled washing machine control board with water-resistant overlay and multi-function slider. IC Role / Device Role / Timing Role: CapSense™ acquisition engine with automatic baseline compensation and proximity wake-up. Use Value: On-chip op-amps condition thermistor signals for drum temperature monitoring - reduces external analog components by 3. |
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-027 | Same package and pinout; adds 24 MHz crystal oscillator input and enhanced USB suspend/resume timing control. | Required for USB host-negotiated suspend/wake in battery-powered devices with strict power budgeting. | Select when USB link power management (LPM) or precise 24 MHz timing reference is mandatory. |
| PSOC™ 4200 (CY8C4247LQI-M485) | Arm® Cortex®-M0 core, 256 kB flash, no native USB - requires external USB bridge IC or uses BLE instead. | Suitable for BLE-connected HMIs where USB is replaced by wireless data transfer and lower latency is needed. | Select when migrating to Arm ecosystem, needing larger code space, and accepting added BOM for USB-BLE bridging. |
Compared with CY8C3666LTI-027, the CY8C3866LTI-027 offers tighter USB timing control for power-aware systems, while the CY8C4247LQI-M485 trades integrated USB for Arm compatibility and scalability - neither is pin-compatible, and both require PCB and firmware rework.
Availability
CY8C3666LTI-027 is available at Aetrix Electronics and suitable for industrial HMI, medical device interfaces, automotive cabin controls, and smart appliance panels requiring stable component supply, long-lifecycle support, and qualified production lots.
Supply support for CY8C3666LTI-027 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 programmable mixed-signal devices, with global manufacturing and quality certification to ISO/TS 16949 and AEC-Q100.
CY8C3666LTI-027 belongs to the PSOC™ 3 family - designed specifically for cost-sensitive, high-integration embedded applications demanding configurable analog/digital logic, capacitive touch, and USB connectivity in a single chip.
FAQ
Does CY8C3666LTI-027 support USB host mode?
No. The CY8C3666LTI-027 implements only USB full-speed device functionality with integrated transceiver 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-role support.
What is the maximum operating temperature for continuous 67 MHz operation?
The CY8C3666LTI-027 is rated for continuous operation at 67 MHz up to +85°C ambient when mounted on a 4-layer PCB with 2 oz copper and proper thermal pad soldering. At +105°C, maximum clock frequency is derated to 48 MHz per Infineon's thermal characterization data (AN91182).
Can CapSense™ electrodes be routed over internal ground planes?
Yes - but only with guard traces or shield layers between electrode traces and underlying ground planes. Direct routing over solid ground planes degrades SNR. Infineon recommends using split ground or dedicated CapSense™ layer with 50 µm clearance and guard ring routing per layout guidelines in AN85951.
Is there hardware support for AES encryption in CY8C3666LTI-027?
No. The CY8C3666LTI-027 does not include dedicated AES hardware acceleration. Cryptographic operations must be implemented in firmware using optimized 8051 assembly or C libraries. For hardware AES, consider PSOC™ 4100S or PSOC™ 6 families with TRNG and CryptoBlock peripherals.
CY8C3666LTI-027 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, USB
- 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-027 FAQ
1.How can I place an order for CY8C3666LTI-027 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C3666LTI-027 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-027 reliable?
The price and inventory of CY8C3666LTI-027 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C3666LTI-027 is usually 5 days.
3.What payment methods are accepted for CY8C3666LTI-027?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C3666LTI-027 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C3666LTI-027?
CY8C3666LTI-027 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C3666LTI-027 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-027?
For technical support, including CY8C3666LTI-027 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C3666LTI-027 requirements.
6.How does Aetrix verify that CY8C3666LTI-027 is sourced from the original manufacturer or authorized distributors?
All CY8C3666LTI-027 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-027 meets industry standards.
7.What is the process for return or replacement of CY8C3666LTI-027?
All CY8C3666LTI-027 units undergo pre-shipment inspection (PSI). If there is an issue with CY8C3666LTI-027, 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-027 part is unused and in its original packaging.
Return procedure for CY8C3666LTI-027:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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