Part Number: CY8C3866AXI-039

Manufacturer: Cypress Semiconductor Corp

Description: IC MCU 8BIT 64KB FLASH 100TQFP

Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of CY8C3866AXI-039

Datasheet  CY8C3866AXI-039 datasheet
Category Integrated Circuits (ICs)
Family Embedded – Microcontrollers
Manufacturer Cypress Semiconductor Corp
Series PSOC? 3 CY8C38xx
Packaging Tray
Part Status Active
Core Processor 8051
Core Size 8-Bit
Speed 67MHz
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) 1.71 V ~ 5.5 V
Data Converters A/D 1x20b, D/A 4x8b
Oscillator Type Internal
Operating Temperature -40°C ~ 85°C (TA)
Package / Case 100-LQFP
Supplier Device Package 100-TQFP (14×14)


Are you interested in the capabilities of programmable embedded systems and their applications in a variety of industries? If this is the case, the CY8C3866AXI-039 could be the answer to your question. This unique PSoC® 3 family microcontroller is a veritable powerhouse when it comes to merging programmable analog and digital peripherals, memory, and a microcontroller all on a single chip. In this comprehensive tutorial, we will investigate the CY8C3866AXI-039’s essential characteristics and capabilities, illustrating how it can open up new possibilities for your projects.

Unveiling the PSoC® 3 Revolution

The CY8C3866AXI-039 is a true tribute to the power of innovation, combining multiple functions into a single chip. It has adjustable analog and digital peripherals, memory, and a microprocessor, providing unrivaled versatility. The following are the important features of the PSoC® 3 architecture:

● 8051 Core Powerhouse

The CY8C3866AXI-039 is powered by an 8051 core, a DMA controller, and a digital filter processor capable of clock frequencies of up to 67 MHz. This gives a solid base for easily processing complex operations and handling multiple peripherals.

● Power Efficiency Redefined

Modern electronics are all about efficiency, and the CY8C3866AXI-039 delivers with its ultra-low power consumption. The device supports numerous power modes, including an extremely low 1-A sleep mode and a 200-nA hibernate mode with RAM retention, while operating within an industry-leading voltage range of 1.71 to 5.5 V. A boost regulator that can function from a 0.5-V input to a 5-V output takes power management to the next level.

● Programmable Peripherals Galore

One of the most impressive features of PSoC devices is the integration of a large number of customizable analog and digital circuits, all controlled by an on-chip microprocessor. With up to 100 digital and analog peripheral functions, the CY8C3866AXI-039 is no exception. This adaptability saves not only design time but also board space, power consumption, and total system expenses.

The CY8C3866AXI-039: Unveiling Its Exceptional Features

The CY8C3866AXI-039 from Cypress Semiconductor, a member of the PSoC® 3 family, is a feature-packed marvel that takes embedded systems to new heights. This concise tutorial emphasizes the following features:

Power and Operating Characteristics

  • Voltage Range:Operates from 1.71 V to 5.5 V with support for six power domains.
  • Temperature Range:Functions reliably between -40°C and 85°C.
  • High-Speed Operation:Clock speeds of up to 67 MHz.
  • Efficient Power Modes:Offers active modes at 1.2 mA (6 MHz) and 12 mA (48 MHz), a sleep mode at 1 µA, and a hibernate mode with RAM retention at just 200 nA.
  • Boost Regulator:Converts input voltage from 0.5 V to a stable 5 V.

Performance Features

  • CPU Power:Houses an 8-bit 8051 CPU with 32 interrupt inputs.
  • Memory:Offers up to 64 KB program flash, ECC support, 8 KB RAM, and 2 KB EEPROM.
  • Digital Peripherals:Includes four 16-bit timer, counter, and PWM (TCPWM) blocks, I2C support, USB 2.0 certification, Full CAN 2.0b, and 16-24 programmable universal digital blocks.
  • Programmable Clocking:Features internal oscillators, external crystal oscillator, and clock dividers.
  • Analog Peripherals:Boasts configurable delta-sigma ADC, up to four DACs, comparators, opamps, and programmable analog blocks. Supports CapSense® for up to 62 sensors.
  • Versatile I/O System:Offers a broad range of I/O pins, performance I/O (SIO) pins, and support for LCD direct drive and CapSense. Supports 1.2 V to 5.5 V interface voltages and up to four power domains.
  • Programming and Debugging:Supports JTAG, SWD, and SWV interfaces and offers bootloader programming through various channels.

Package Options and Development Support

  • Package Variety:Available in 48-pin SSOP, 48-pin QFN, 68-pin QFN, 100-pin TQFP, and 72-pin WLCSP options.
  • Development Support:Cypress provides the free PSoC Creator™ tool for schematic and firmware design, over 100 PSoC Components™, a free Keil 8051 compiler, and device programming and debugging support.

In conclusion, the CY8C3866AXI-039 is a versatile and powerful SoC that fits the requirements of a wide range of embedded system applications. Its comprehensive feature set and inventive design distinguish it as a standout alternative for developers eager to construct cutting-edge solutions. With Cypress Semiconductor’s dedication to innovation, this SoC foresees a bright future for embedded systems.

Applications of CY8C3866AXI-039

The CY8C3866AXI-039’s versatility and robust features make it an excellent choice for a wide range of applications, including:

● IoT Devices:

The CY8C3866AXI-039 is an excellent choice for IoT device development. It can effectively manage data processing and communication because to its low power consumption and high processing capabilities, making it ideal for a variety of Internet of Things applications.

● Sensor Interfaces:

The microcontroller’s analog and CapSense functions are highly handy for building sensor interfaces. This microcontroller can capture and interpret sensor data accurately for environmental monitoring, touch sensors, and any other sensor-based application.

● Automotive Electronics:

The CY8C3866AXI-039 stands out in the automotive industry due to its wide voltage range and versatile peripherals. It is suitable for a wide range of automotive applications, including engine control, infotainment systems, lighting control, and sensor interfaces, and ensures high reliability and performance.

● Industrial Control:

The CY8C3866AXI-039 is an excellent choice for industrial control systems. Its outstanding performance, adaptable I/O configuration, and versatile digital peripherals provide accurate control of machinery and processes. It is very useful in factory automation and process control applications.

● Consumer Electronics:

The adjustable functionalities of the microcontroller are a key advantage in the development of consumer electronics products. This functionality enables you to customize the microcontroller to match the specific needs of your product, whether it’s a smart home device, wearables, or any other consumer item.

● Medical Devices:

The CY8C3866AXI-039’s low-power characteristics and extensive memory options make it a good candidate for portable and wearable medical devices. Its capacity to effectively analyze data, combined with its low power consumption, is critical for battery-powered medical equipment that demand precision and durability.


The CY8C3866AXI-039 from Cypress Semiconductor’s PSoC 3 family is a true marvel in programmable embedded systems. Its exceptional performance, low power consumption, and extensive capabilities offer boundless possibilities across various industries.

Now equipped with a comprehensive guide, you have the knowledge to embark on your journey of innovation with this remarkable microcontroller. Don’t delay; start your innovative journey with CY8C3866AXI-039 and ICRFQ to enhance your electronic systems’ reliability and efficiency. Your path to groundbreaking projects and solutions begins today!

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Kevin Chen