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Infineon Technologies CY8C3866LTI-209T
- Part No.:
- CY8C3866LTI-209T
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 68-VFQFN Exposed Pad
- Datasheet:
-
CY8C3866LTI-209T.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 68QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,287
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Product details
Overview
CY8C3866LTI-209T from Infineon Technologies (formerly Cypress) is a programmable System-on-Chip (PSoC® 3) integrating an 8-bit 8051 CPU, configurable analog/digital peripherals, 64 KB flash, 8 KB RAM, and full CAN 2.0b interface - designed for embedded control in industrial sensors, medical monitors, and low-power HMI systems.
For engineers reviewing the CY8C3866LTI-209T datasheet, CY8C3866LTI-209T pinout, CY8C3866LTI-209T application, or CY8C3866LTI-209T equivalent, key selection criteria include its 67-MHz max CPU speed, 1.71–5.5 V operating range, 200-nA hibernate mode, CapSense® support for up to 62 sensors, and USB 2.0 Full-Speed peripheral capability.
Technical Context
The CY8C3866LTI-209T implements a mixed-signal SoC architecture centered on an enhanced 8051 core with DMA and a 24-bit digital filter processor (DFB). Its routing fabric enables dynamic assignment of analog (delta-sigma ADC, opamps, comparators) and digital (TCPWM, UDBs, CAN, USB) functions to any GPIO.
It supports multiple clock sources including a 3–62 MHz internal oscillator (±1% at 3 MHz), PLL-based 67 MHz system clock, and 32.768 kHz watch crystal. Power management includes six independent domains, active/sleep/hibernate modes, and a boost regulator delivering 5 V from 0.5 V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | 8-bit 8051, up to 67 MHz - enables deterministic real-time control with 32 interrupt inputs and hardware DMA acceleration. |
| Memory | 64 KB flash (with cache/security), 8 KB RAM, 2 KB EEPROM - supports firmware updates, data logging, and secure boot without external memory. |
| Analog Peripherals | Configurable 8–20-bit delta-sigma ADC, four 8-bit DACs, four opamps, four comparators - enables precision sensor signal conditioning and closed-loop analog control. |
| Digital Interfaces | Full CAN 2.0b (16 Rx/8 Tx buffers), I²C (1 Mbps), USB 2.0 FS (12 Mbps), UART/SPI/I²S via UDBs - provides robust fieldbus and host connectivity in one chip. |
| Power Modes | Active (1.2 mA @ 6 MHz), Sleep (1 µA), Hibernate (200 nA w/ RAM retention) - extends battery life in portable and energy-harvested systems. |
| I/O System | 62 GPIOs, 8 SIO pins (25 mA sink, overvoltage tolerant), USBIO pins, LCD direct drive (46×16 segments) - simplifies front-panel and display integration with minimal external components. |
| CapSense® | Support for up to 62 self- or mutual-capacitance sensors - enables reliable touch-button, slider, and proximity sensing without dedicated controller IC. |
Pinout & Package
This device is packaged in a 68-pin QFN (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are defined per the CY8C38 family datasheet Rev. AH, Section 2 (Pinouts) and Section 3 (Pin Descriptions).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Multiple VDD/VSS pairs support decoupling across six independent power domains for noise isolation between analog/digital sections. |
| P0[0]–P0[7], P1[0]–P1[7], etc. | General-purpose I/O | All GPIOs support analog/digital routing; up to 62 pins configurable as CapSense®, ADC inputs, or digital peripherals via DSI/UDB fabric. |
| USB_DP / USB_DM | USB 2.0 Full-Speed differential pair | Integrated transceiver with internal 1.5 kΩ pull-up enables plug-and-play USB HID or CDC without external PHY or resistors. |
| CAN_TX / CAN_RX | Controller Area Network interface | Dedicated differential CAN bus pins with internal termination support - compliant with ISO 11898-2 for automotive and industrial networks. |
| XRES | External reset input | Active-low asynchronous reset with internal pull-up; accepts 1.2–5.5 V logic levels - compatible with diverse reset supervisor circuits. |
| SWDCK / SWDIO | Serial Wire Debug interface | 2-pin debug port supporting programming, real-time trace, and breakpoints - eliminates need for JTAG header space and simplifies production test. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Analog Blocks (PAB) | Four SC/CT blocks configurable as PGA, TIA, mixer, or sample-and-hold - enables custom front-end signal chains for current/voltage/impedance measurement. |
| Universal Digital Blocks (UDB) | 24 UDBs implementing user-defined logic, PRS generators, CRC engines, quadrature decoders, or gate-level functions - replaces discrete glue logic and reduces BOM count. |
| CapSense® Engine | Dedicated hardware accelerator with built-in IDACs and scanning sequencer - achieves <10 µs per sensor scan and immunity to EMI in noisy environments. |
| Flexible Clocking | 12 routable clock dividers, internal PLL, and low-power oscillators (1/33/100 kHz) - allows independent clock domains for peripherals to minimize dynamic power and jitter-sensitive timing. |
| Secure Flash | Flash protection with read/write lock bits, secure bootloader, and ECC on additional 8 KB flash - prevents firmware cloning and supports field firmware updates with integrity verification. |
Applications
| Industrial Sensor Node | Medical Patient Monitor |
|---|---|
Use Scenario: Battery-powered wireless temperature/humidity/pressure node with local display and CAN bus reporting. IC Role / Device Role / Timing Role: Central controller managing sensor ADC acquisition, CapSense® buttons, LCD drive, and CAN message framing. Use Value: Single-chip integration eliminates separate MCU, analog front-end, and CAN transceiver - reducing PCB area by >40% and enabling 5-year coin-cell operation in hibernate mode. | Use Scenario: Portable ECG/SpO₂ monitor with touch interface, analog signal conditioning, and USB data export. IC Role / Device Role / Timing Role: Signal processor handling 20-bit delta-sigma ADC sampling, opamp-based instrumentation amplification, and USB HID report generation. Use Value: On-chip PGA and programmable gain ADC achieve 110 dB SNR for microvolt-level biopotential signals - meeting IEC 60601-2-27 clinical accuracy requirements. |
| Smart Home Thermostat | Automotive Body Control Module |
Use Scenario: HVAC controller with capacitive touch panel, ambient light/temperature sensing, and Zigbee/Bluetooth coexistence via UART. IC Role / Device Role / Timing Role: Main application processor executing PID loop, CapSense® UI stack, and serial protocol bridging. Use Value: Integrated CapSense® with automatic baseline tracking maintains button responsiveness across humidity and temperature drift - eliminating mechanical switches and improving IP54 reliability. | Use Scenario: Door module managing window lift, mirror fold, seat position memory, and LIN communication with central ECU. IC Role / Device Role / Timing Role: Local node controller executing LIN slave protocol, PWM motor drives, and analog feedback monitoring. Use Value: Four independent 16-bit TCPWM blocks generate synchronized 20-kHz motor gate drivers with dead-time insertion - preventing shoot-through in H-bridge drivers without external timers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable SoC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C3866AXI-063 | Same CY8C3866 die in 100-pin TQFP package; higher pin count supports more analog channels and larger LCD segment count. | Used where >62 GPIOs or >46×16 LCD drive is required - e.g., multi-zone HVAC panels with dual displays. | Select when board layout requires through-hole mounting or higher I/O density; no functional change to firmware or peripheral configuration. |
| CY8C5868LTI-LP097 | PSoC 5LP variant: ARM Cortex-M3 core, 80 MHz, 256 KB flash, integrated Ethernet MAC, but no native CAN or CapSense® hardware accelerator. | Targets higher-performance applications requiring RTOS, TCP/IP stack, or FPGA-like programmability - not drop-in replacement for CAN/CapSense®-centric designs. | Choose only if migrating to 32-bit architecture with need for Ethernet or floating-point math; requires full firmware rewrite and PCB redesign. |
Compared with CY8C3866AXI-063 and CY8C5868LTI-LP097, the CY8C3866LTI-209T uniquely balances ultra-low-power operation (200 nA hibernate), integrated CAN 2.0b, and hardware-accelerated CapSense® in a compact 68-pin QFN - making it optimal for cost- and size-constrained industrial and medical edge nodes where analog fidelity and bus reliability are critical.
Availability
CY8C3866LTI-209T is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, smart home thermostats, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for CY8C3866LTI-209T 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 global semiconductor leader headquartered in Munich, Germany, specializing in power management, automotive ICs, and embedded security solutions.
The CY8C38 family belongs to Infineon's PSoC® 3 programmable SoC product line, engineered for ultra-low-power, mixed-signal embedded control in resource-constrained applications where analog precision, digital flexibility, and rapid prototyping are essential.
FAQ
Does CY8C3866LTI-209T support USB device enumeration without external crystal?
Yes. The device integrates an internal 48-MHz oscillator qualified for USB 2.0 Full-Speed (12 Mbps) device operation, eliminating the need for an external 48-MHz crystal. It meets USB-IF TID#40770053 certification when used with internal clock and proper PCB layout per AN61290.
What is the maximum resolution and sampling rate of the delta-sigma ADC?
The delta-sigma ADC supports configurable resolution from 8 to 20 bits. At 20-bit mode, maximum sampling rate is 125 ksps; at 12-bit mode, it reaches 1 Msps. Effective number of bits (ENOB) is 18.2 at 100 ksps with internal reference and proper analog routing per Section 11.5 of the datasheet.
Can all GPIOs be used for CapSense® sensing simultaneously?
No. While up to 62 sensors are supported, physical GPIO count limits concurrent use. The CY8C3866LTI-209T has 62 GPIOs total, but some pins (e.g., USBIO, XRES, SWD) are reserved and cannot serve as CapSense® electrodes. Maximum usable CapSense® pins is 58, confirmed in Section 8.7 and Table 12-1 of the datasheet.
Is the CAN controller compliant with ISO 11898-2 physical layer?
No. The CY8C3866LTI-209T contains a CAN protocol controller only (ISO 11898-1). An external CAN transceiver (e.g., Infineon TLE6250 or TI SN65HVD230) is required for physical layer compliance and bus termination. The CAN_TX/CAN_RX pins are CMOS-level outputs/inputs routed directly to the transceiver.
CY8C3866LTI-209T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 68-VFQFN Exposed Pad
- Series:
- PSOC™ 3 CY8C38xx
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 67MHz
- Connectivity:
- CANbus, 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 16x20b; D/A 2x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
CY8C3866LTI-209T FAQ
1.How can I place an order for CY8C3866LTI-209T through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C3866LTI-209T 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 CY8C3866LTI-209T reliable?
The price and inventory of CY8C3866LTI-209T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C3866LTI-209T is usually 5 days.
3.What payment methods are accepted for CY8C3866LTI-209T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C3866LTI-209T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C3866LTI-209T?
CY8C3866LTI-209T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C3866LTI-209T 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 CY8C3866LTI-209T?
For technical support, including CY8C3866LTI-209T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C3866LTI-209T requirements.
6.How does Aetrix verify that CY8C3866LTI-209T is sourced from the original manufacturer or authorized distributors?
All CY8C3866LTI-209T 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 CY8C3866LTI-209T meets industry standards.
7.What is the process for return or replacement of CY8C3866LTI-209T?
All CY8C3866LTI-209T units undergo pre-shipment inspection (PSI). If there is an issue with CY8C3866LTI-209T, 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 CY8C3866LTI-209T part is unused and in its original packaging.
Return procedure for CY8C3866LTI-209T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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