CY8C3866AXA-040
CY8C3866AXA-040 - 67MHz 8051 MCU with 64KB Flash | Infineon
The Infineon CY8C3866AXA-040 is an 8-bit PSoC 3 CY8C38xx microcontroller with a 67 MHz 8051 core, 64 KB of flash memory, and 8 KB of SRAM in a 100-pin TQFP package. The device combines programmable analog, digital, and LCD functions with a microcontroller core, creating a compact platform for embedded control, sensing, communications, and user-interface applications.
A programmable system-on-chip, or PSoC, integrates a CPU, memory, analog peripherals, digital peripherals, and configurable interconnect resources on one die. Within the broader semiconductor hierarchy, the CY8C3866AXA-040 is a microcontroller and system-on-chip that replaces separate combinations of processor, memory, interface logic, analog circuitry, and display-control components. Its 8051-compatible core provides a familiar embedded-control architecture with deterministic peripheral integration.
The principal device characteristics include a maximum clock frequency of 67 MHz, 64 KB of flash program memory, and 8 KB of SRAM. The CY8C38 family also supports analog, digital, and LCD-oriented functions, allowing designers to reserve resources for mixed-signal control rather than relying only on fixed-purpose digital peripherals. This integration can reduce board area and the number of external components in compact industrial, consumer, and communications designs.
The 100-TQFP package provides a substantial number of external connections for power, ground, programming, clock, communications, analog, digital, and display functions. Although the package supports a broad peripheral mix, final peripheral availability, routing, and pin multiplexing must be checked in the device configuration tables. Clocking, programming, reset, and power sequencing should also be validated against the device's electrical and pin requirements before schematic capture.
Typical uses include industrial control panels, compact sensor nodes, touch-enabled interfaces, display controllers, building automation modules, and low-cost embedded instruments. The LCD capability is particularly useful for local human-machine interfaces, while the analog and digital resources support mixed-signal sensing and actuator control. The 67 MHz core also provides additional processing headroom for protocols and supervisory logic.
A key design consideration is that firmware, peripheral configuration, and the selected package's pin assignments must be coordinated as one design. Use the manufacturer pin-description table, memory map, and configuration guidance when assigning PCB tracks. Confirm the exact ordering suffix and temperature-grade requirements against the system operating environment before releasing the production BOM.
This page consolidates component specifications, drop-in-replacement findings, package considerations, comparison data, and practical application guidance into a design-focused reference for engineers evaluating the CY8C3866AXA-040.
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