CY8C3866AXA-040 - 67MHz 8051 MCU with 64KB Flash | Infineon
料号： CY8C3866AXA-040 ✓ 量产中CY8C3866AXA-040 概述
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.
直接替换替代料： CY8C3866AXA-040 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
CY8C3866AXI-039
✅ 直接替换📋 参考替代料（不在目录中）
CY8C3866AXA-040 最大额定值与电气特性
| Product Type | 8-bit PSoC 3 CY8C38xx Microcontroller |
| CPU Core | 8051 |
| 最大时钟频率 | 67 MHz |
| Flash Memory | 64 KB |
| SRAM | 8 KB |
| 工作电源电压 | 0.5 V to 5.5 V |
| 封装 | 100-TQFP, 14 mm x 14 mm |
| Programmable Resources | Analog, digital, and LCD functions |
| CPU Architecture | 8-bit |
| 安装类型 | Surface Mount |
| 引脚数量 | 100 pins |
| Manufacturer | Infineon Technologies |
| Original Product Family | Cypress PSoC 3 |
CY8C3866AXA-040 100-tqfp, 14 mm x 14 mm 引脚配置指南
CY8C3866AXA-040（100-tqfp, 14 mm x 14 mm 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： CY8C3866AXA-040.
请参阅 数据手册 以查看完整引脚配置。
典型应用
CY8C3866AXA-040 适用于 6 应用s: Industrial Control Panel, Compact Sensor Node, Building Automation Module, Touch-Enabled User Interface, Display Controller, Embedded Instrument Controller.
Industrial Control Panel
The CY8C3866AXA-040 fits an industrial control panel that combines local display control, digital inputs, analog sensing, and supervisory logic in a compact assembly. Its 67 MHz 8051 core can handle panel scanning and control tasks, while 64 KB of flash stores firmware and 8 KB of SRAM supports runtime data. The programmable analog, digital, and LCD resources allow one device to perform mixed-signal functions that would otherwise require several controllers. The principal design constraint is the 100-pin TQFP footprint: confirm the required LCD, communication, sensing, and power pins in the configuration tables before committing the board layout.
推荐
Compact Sensor Node
A compact sensor node can use the CY8C3866AXA-040 to acquire analog measurements, process them, and manage a local digital interface without a separate analog processor. The PSoC 3 architecture places configurable analog and digital blocks alongside the 8051 core, while 64 KB flash provides room for calibration, filtering, diagnostics, and communications code. Its 0.5 V to 5.5 V listed operating range supports integration with constrained embedded systems. Engineers should still budget power carefully, validate sensor excitation and ADC-related limits, and verify whether CAN is used because that block is material to the documented -039 drop-in substitution path.
推荐
Building Automation Module
The CY8C3866AXA-040 is suitable for a building-automation module that must read sensors, evaluate local logic, and expose status through digital communications. Its 8051 processing core runs at up to 67 MHz, providing processing margin for protocol stacks and supervisory tasks, while the 8 KB SRAM supports buffering and state management. Programmable analog resources can simplify sensor conditioning, and digital resources can implement timers, counters, and communication interfaces. In low-energy installations, firmware should use the device's low-power modes and disable unused peripherals. Exact peripheral availability, pin multiplexing, and the CAN resource must be verified for the selected device configuration.
推荐
Touch-Enabled User Interface
The CY8C3866AXA-040 supports a touch-enabled interface by combining an 8051 controller, configurable digital resources, analog sensing, and LCD functions in one device. The 64 KB flash capacity can hold interface firmware, graphics-control routines, and communication handlers, while the 67 MHz clock supports responsive debouncing and screen updates. Analog touch sensing can be implemented with the PSoC family's programmable blocks, reducing the need for a separate controller. Because the package exposes many peripheral options, the design should map the display and touch interfaces early and follow the manufacturer's recommended capacitor values, routing, and grounding practices.
推荐
Display Controller
For an embedded display controller, the CY8C3866AXA-040 combines an 8051 core with programmable LCD, digital, and analog resources in a single 100-pin TQFP device. The 67 MHz operating frequency supports display timing and local logic, and the 64 KB flash and 8 KB SRAM provide space for firmware and display-state handling. A single-chip implementation can reduce the controller count in a compact instrument or appliance. Validate the target display's electrical requirements, supported interface resources, refresh requirements, and available pins. If the design depends on CAN, use the -039 substitution only after confirming that CAN is not required.
推荐
Embedded Instrument Controller
The CY8C3866AXA-040 can serve as the central controller in a compact measurement instrument that combines acquisition, signal processing, display handling, and communications. Its configurable analog resources can support front-end control, the 8051 core can execute measurement and control algorithms, and the LCD-oriented resources can drive a local screen. The 67 MHz clock and 8 KB SRAM provide useful processing headroom, although firmware must observe memory limits and real-time interrupt constraints. The 100-pin package makes external routing manageable, but analog grounding, reference routing, decoupling, and calibration strategy remain critical for predictable measurement performance.
推荐
推荐产品汇总
工程参考数据： CY8C3866AXA-040 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | CY8C3866AXI-039 |
|---|---|---|
| Package | 100-TQFP, 14 mm x 14 mm | 100-TQFP |
| Brand | Infineon Technologies | Infineon Technologies |
| CPU Core | 8051, 8-bit | 8051, 8-bit |
| Programmable Resources | Analog, digital, and LCD functions | Analog, digital, and LCD functions |
| Ordering Suffix | -040 | -039 |
| Documented Drop-In Condition | Target device | Described as drop-in when CAN is not used |
关键差异点
- Exact -040 ordering option （对比 CY8C3866AXI-039)
- Defined 67 MHz operating point （对比 CY8C3866AXI-039)
- Documented CAN-aware replacement condition （对比 CY8C3866AXI-039)
设计说明
Start the PCB layout from the exact 100-pin TQFP footprint and pin-description table. Place decoupling capacitors close to their associated supply pins, provide a continuous ground reference, and route high-speed clock and communication signals away from sensitive analog inputs. Because PSoC resources are multiplexed, finalize peripheral assignments before routing rather than treating all package pins as dedicated functions.
The listed 0.5 V to 5.5 V range defines the device's broad operating supply capability, not an allowance to apply the maximum voltage to every power domain. Use the manufacturer's recommended operating conditions for the core, analog, and I/O supplies, and validate sequencing during power-up and shutdown. A localized decoupling network and separate analog filtering may be needed when noisy digital activity must remain isolated from measurement circuits.
Do not approve CY8C3866AXI-039 as a substitution without checking whether the design uses CAN, as the documented drop-in scenario specifically excludes CAN use. Also compare peripheral configuration, maximum clock, memory needs, temperature requirements, and qualification for the exact AXA-040 ordering code. A matching package is necessary for PCB compatibility, but it does not by itself establish functional equivalence.
Treat analog and digital grounds according to the manufacturer's recommended implementation, especially when the programmable analog blocks are used for sensing. Keep high-current return paths away from reference and signal returns, minimize loop areas, and follow the datasheet's component-placement guidance for analog inputs. Validate the final layout with signal-integrity and noise measurements because programmable mixed-signal routing can affect measurement stability.
合规信息
No explicit environmental or compliance declarations were identified for the exact CY8C3866AXA-040 ordering code.
