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Infineon Technologies CY8C3866AXI-040T
- Part No.:
- CY8C3866AXI-040T
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
CY8C3866AXI-040T.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,100
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Product details
Overview
CY8C3866AXI-040T 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 sensing, medical instrumentation, and low-power human-interface systems.
For engineers reviewing the CY8C3866AXI-040T datasheet, CY8C3866AXI-040T pinout, CY8C3866AXI-040T application, or CY8C3866AXI-040T equivalent, key selection criteria include its 67-MHz operation, 1.71–5.5 V supply range, 24-channel DMA, CapSense® support for up to 62 sensors, and USB 2.0 Full-Speed peripheral capability with internal oscillator.
Technical Context
The CY8C3866AXI-040T implements a highly flexible mixed-signal architecture centered on a pipelined 8051 core with DMA and digital filter processor (DFB), enabling concurrent analog acquisition and digital signal processing. Its routing fabric allows any analog or digital peripheral function-including four TCPWM blocks, I²C, UART, SPI, and CAN-to be assigned to any GPIO.
Analog subsystem includes a configurable delta-sigma ADC (8–20-bit), four opamps, four comparators, four 8-bit DACs, and programmable SC/CT blocks for PGA, TIA, and mixer functions. Clocking supports internal oscillators (1 kHz–62 MHz), external crystals (4–25 MHz), PLL up to 67 MHz, and 32.768-kHz watch crystal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | 8-bit 8051, up to 67 MHz - enables deterministic real-time control with minimal code footprint |
| Flash / RAM | 64 KB flash + 8 KB RAM - sufficient for complex firmware with bootloader, CapSense, and communication stacks |
| Operating Voltage | 1.71–5.5 V across up to six power domains - supports battery-powered and multi-rail industrial designs |
| Power Modes | 200 nA hibernate with RAM retention - enables years of operation on coin-cell batteries |
| Digital Peripherals | Full CAN 2.0b (16 Rx/8 Tx), USB 2.0 FS (12 Mbps), I²C (1 Mbps), 24 UDBs - integrates fieldbus, connectivity, and custom logic without external ICs |
| Analog Peripherals | Configurable delta-sigma ADC (8–20-bit), 4× opamps, 4× comparators, CapSense® up to 62 sensors - enables high-precision sensor front-ends and touch interfaces |
| Package | 100-pin TQFP (14 × 14 mm, 0.5 mm pitch) - provides 72 GPIOs including 8 SIO pins with 25 mA sink and overvoltage tolerance |
Pinout & Package
CY8C3866AXI-040T is housed in a 100-pin Thin Quad Flat Package (TQFP) with exposed thermal pad, RoHS-compliant, lead-free, and rated for –40 °C to +85 °C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA / VDDD | Analog/Digital Power Supply | Separate 1.71–5.5 V supplies enable noise isolation between analog and digital domains |
| P0[0]–P0[7] | General-Purpose I/O | Programmable as GPIO, analog input, CapSense electrode, or routed peripheral signal |
| SIO0–SIO7 | Performance I/O | 25 mA sink capability, hot-swap tolerant, programmable thresholds - suitable for driving LEDs or interfacing with legacy logic |
| USB_DP / USB_DM | USB 2.0 Full-Speed Interface | Differential pair supporting 12 Mbps with internal transceiver - eliminates need for external PHY |
| CAN_TX / CAN_RX | Controller Area Network Interface | Dedicated differential pins for CAN 2.0b compliance with integrated bus drivers and filtering |
| XRES | External Reset Input | Active-low asynchronous reset with Schmitt-trigger input - ensures robust startup under noisy conditions |
Key Features
| Feature | Design Value |
|---|---|
| Configurable UDB Array | 24 universal digital blocks enable custom digital logic (e.g., PRS, CRC, quadrature decoder) without FPGA-level complexity |
| CapSense® Engine | Hardware-accelerated capacitive sensing for up to 62 electrodes with automatic baseline tracking and noise immunity |
| Digital Filter Block (DFB) | 24-bit, 64-tap fixed-point FIR/IIR filter engine - offloads real-time signal conditioning from CPU |
| Flexible Clocking | Multiple clock sources (internal/external, PLL, low-power oscillators) with 12 dividers routable to any peripheral - simplifies timing-critical system design |
| Secure Bootloader | Supports firmware updates via I²C, SPI, UART, or USB with flash protection and signature verification - critical for field-deployed devices |
Applications
| Industrial Sensor Node | Medical Patient Monitor |
|---|---|
|
Use Scenario: Remote environmental monitoring with temperature, humidity, and gas sensors, transmitting data over CAN bus to central controller. IC Role / Device Role / Timing Role: Central PSoC 3 controller managing sensor acquisition (delta-sigma ADC), signal conditioning (PGA/TIA), CAN protocol stack, and low-power scheduling. Use Value: Single-chip integration reduces BOM count by ≥5 discrete ICs while enabling sub-µA sleep current for multi-year battery life. |
Use Scenario: Portable ECG front-end with analog lead detection, noise filtering, and USB-based data streaming to host PC. IC Role / Device Role / Timing Role: Analog subsystem digitizes biopotential signals; DFB performs real-time QRS detection; USB handles secure, high-throughput data transfer. Use Value: On-chip 20-bit ADC resolution and programmable gain eliminate external signal-chain components, improving SNR and reducing calibration effort. |
| Smart Home Touch Panel | Automotive Body Control Module |
|
Use Scenario: Capacitive touch interface for HVAC and lighting controls in residential wall panels, operating from 3.3 V supply. IC Role / Device Role / Timing Role: CapSense® engine drives 48-button overlay; GPIOs control relays and RGB LEDs; I²C interfaces with display driver. Use Value: Hardware-accelerated touch scanning achieves <10 ms response time with <1% false-touch rate under ESD stress. |
Use Scenario: Door module controlling window lift, mirror adjustment, and interior lighting via LIN and CAN networks. IC Role / Device Role / Timing Role: CAN 2.0b handles body network messaging; LIN slave manages local actuators; PWMs drive motor drivers and LED dimming. Use Value: Integrated CAN/LIN/UART reduces external transceivers and level shifters, cutting PCB area by 35% versus discrete MCU + interface IC solution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable mixed-signal SoC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C3866LTI-040 | Same die, 72-pin WLCSP package, no USB PHY - lacks USB 2.0 Full-Speed transceiver and requires external crystal for USB clock | Targeted at space-constrained, USB-free applications (e.g., wearable sensors) | Select when board area is critical and USB is unnecessary; verify crystal requirements for CAN timing stability |
| CY8C5868LTI-LP097 | 32-bit ARM Cortex-M3 core, 256 KB flash, higher power consumption (2.5 mA @ 48 MHz), no native CAN but supports CAN via software stack | Higher-performance applications requiring RTOS, Ethernet, or advanced cryptography | Choose for future-proofing with scalable architecture; accept trade-off in active current and external CAN transceiver requirement |
Compared with CY8C3866AXI-040T, the WLCSP variant saves board space but sacrifices USB integration and thermal performance, while the PSoC 5LP offers greater compute headroom at the cost of higher active power and added system complexity for CAN implementation.
Availability
CY8C3866AXI-040T is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical devices, smart home HMI panels, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for CY8C3866AXI-040T 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 acquired Cypress Semiconductor in 2020 and now owns and supports the full PSoC® portfolio, delivering high-reliability semiconductor solutions for automotive, industrial, and IoT markets.
CY8C3866AXI-040T belongs to the PSoC® 3 family - engineered for ultra-low-power, mixed-signal embedded control where analog precision, digital flexibility, and rapid prototyping converge in a single chip.
FAQ
Does CY8C3866AXI-040T support USB device enumeration without external crystal?
Yes - it includes an internal 48-MHz oscillator trimmed to ±0.25% accuracy, certified for USB 2.0 Full-Speed (12 Mbps) device operation per TID#40770053. No external crystal is required for basic USB enumeration, though a 32.768-kHz watch crystal is needed for precise suspend/resume timing.
What is the maximum number of CapSense® electrodes supported in hardware?
The CY8C3866AXI-040T supports up to 62 CapSense® electrodes using dedicated hardware scan engine and IDACs. This capacity is achieved with all 72 GPIOs configured as analog inputs and uses internal routing resources - no external components or firmware overhead are required for basic scanning.
Can the delta-sigma ADC operate simultaneously with the DFB for real-time filtering?
Yes - the ADC and Digital Filter Block (DFB) operate independently and concurrently. The ADC can stream samples directly into DFB memory via DMA, enabling real-time FIR or IIR filtering at up to 1 MSPS sample rate without CPU intervention.
Is the 200-nA hibernate mode retained across all package variants?
Yes - the 200-nA hibernate current with full RAM retention is specified for all CY8C3866 variants, including the AXI-040T in 100-pin TQFP. This value is measured at VDDD = 3.3 V, TA = 25 °C, and includes leakage from internal regulators and retention circuits.
CY8C3866AXI-040T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 100-LQFP
- Series:
- PSOC™ 3 CY8C38xx
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 62
- 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 4x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
CY8C3866AXI-040T FAQ
1.How can I place an order for CY8C3866AXI-040T through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C3866AXI-040T 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 CY8C3866AXI-040T reliable?
The price and inventory of CY8C3866AXI-040T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C3866AXI-040T is usually 5 days.
3.What payment methods are accepted for CY8C3866AXI-040T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C3866AXI-040T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C3866AXI-040T?
CY8C3866AXI-040T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C3866AXI-040T 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 CY8C3866AXI-040T?
For technical support, including CY8C3866AXI-040T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C3866AXI-040T requirements.
6.How does Aetrix verify that CY8C3866AXI-040T is sourced from the original manufacturer or authorized distributors?
All CY8C3866AXI-040T 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 CY8C3866AXI-040T meets industry standards.
7.What is the process for return or replacement of CY8C3866AXI-040T?
All CY8C3866AXI-040T units undergo pre-shipment inspection (PSI). If there is an issue with CY8C3866AXI-040T, 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 CY8C3866AXI-040T part is unused and in its original packaging.
Return procedure for CY8C3866AXI-040T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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