Infineon Technologies CY8C3666AXI-036

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Product attributes Property Value
Manufacturer Infineon Technologies
Product Series PSOC™ 3 CY8C36xx
Packaging Tray |
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 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 16x12b; D/A 4x8b
Oscillator Type Internal
Operating Temperature -40°C ~ 85°C (TA)
Grade -
Qualification AEC -
Mounting Type Surface Mount
Supplier Device Package 100-TQFP (14x14)
Package / Case 100-LQFP
ROHS RoHS Compliant - Hazardous Substance Free Electronic Components | HQICKEY

The Infineon CY8C3666AXI-036 is a versatile 8051-based microcontroller with integrated CapSense, LCD drive, and PWM. Operating from 1.71V to 5.5V at 67MHz, it balances performance with low power. The 100-LQFP package and 64KB flash make it suitable for compact, feature-rich designs. Built-in DMA and watchdog enhance reliability in consumer and industrial applications.

  • Integrated CapSense: Eliminates external touch ICs, reducing BOM cost and board space.
  • Wide voltage range (1.71V-5.5V): Supports both battery and 5V logic, simplifying power design.
  • 8051 core at 67MHz: Familiar architecture with sufficient speed for real-time control.
  • On-chip LCD drive: Directly drives segment displays, saving external driver chips.
  • DMA + WDT: Improves data throughput and system reliability in noisy environments.

Touch-Sensitive Control Panels

Integrated CapSense allows direct capacitive touch buttons and sliders, ideal for white goods and consumer electronics with a clean interface.

Portable Medical Devices

The 1.71V low-voltage operation extends battery life in glucose meters and pulse oximeters, while the 8051 core simplifies firmware development.

Industrial HMI Displays

With LCD drive and PWM, it can control segment LCDs and backlight dimming, suitable for factory automation panels.

Smart Home Sensors

The wide voltage range and low power modes enable battery-powered temperature/humidity sensors with wireless module interfaces.

Automotive Interior Lighting

PWM channels drive LED lighting with smooth dimming, while WDT ensures fail-safe operation in cabin control modules.

IoT Edge Nodes

DMA and 64KB flash support protocol stacks for sensor data aggregation, bridging to cloud gateways via UART/SPI.

Q: What core does the CY8C3666AXI-036 use?
A: It is based on the 8051 core, running at up to 67MHz, offering a well-known architecture for easy development.
Q: What is the supply voltage range?
A: It operates from 1.71V to 5.5V, providing flexibility for battery or 5V logic systems.
Q: Does it support capacitive sensing?
A: Yes, it includes CapSense technology, enabling touch interfaces without external components.
Q: What is the package size?
A: It comes in a 100-LQFP package, suitable for compact PCB layouts.
Q: What are the key integrated peripherals?
A: It features DMA, LCD drive, POR, PWM, and WDT, reducing external part count.
Base Product Number : CY8C3666AXI-036
100-LQFP 64KB Flash 67MHz 8-bit MCU 8051 CapSense CY8C3666AXI-036 Infineon LCD Low Power Touch
Q: What core does the CY8C3666AXI-036 use?
A: It is based on the 8051 core, running at up to 67MHz, offering a well-known architecture for easy development.
Q: What is the supply voltage range?
A: It operates from 1.71V to 5.5V, providing flexibility for battery or 5V logic systems.
Q: Does it support capacitive sensing?
A: Yes, it includes CapSense technology, enabling touch interfaces without external components.
Q: What is the package size?
A: It comes in a 100-LQFP package, suitable for compact PCB layouts.
Q: What are the key integrated peripherals?
A: It features DMA, LCD drive, POR, PWM, and WDT, reducing external part count.