W78ERD2A40FL - 40MHz 64KB 8052 MCU | Nuvoton | BQFP
部品番号: W78ERD2A40FL ✓ 生産中W78ERD2A40FL 概要
An 8-bit microcontroller is a programmable semiconductor containing a central processing unit, program memory, data memory, peripheral registers, and I/O ports on one integrated circuit. Within the product hierarchy, the W78ERD2A40FL is a general-purpose MCU, an embedded controller, and a member of the Nuvoton W78 family. Its 8052-compatible core provides a practical migration path for applications using standard 8051-class peripherals and software conventions.
The principal advantages of this device are its 40 MHz clock rating, 64 KB flash organization, 36 available I/O lines, and dedicated boot-block storage. The 6T process designation identifies the manufacturing process used for the integrated circuit, while the Programmable Counter Array provides dedicated timing and capture functions that can reduce reliance on software polling. Four 8-bit I/O ports follow the established 8052 peripheral model, including software-selectable internal pull-ups on Port 0.
Technically, the W78ERD2A40FL combines a fast 8-bit core with separate program and data memory regions. The 64 KB program memory is organized as 64K by 8 bits, while the 1.25 KB data RAM is organized as 1.25K by 8 bits. Its power-down mode can be entered without disrupting the processor state, supporting systems that need low-energy operating states. The device is intended for a 5 V operating environment and is identified as lead-free by the manufacturer product listing.
Typical applications include industrial keypad and panel controllers, small motor-control systems, programmable timers, data-acquisition front ends, communication peripherals, legacy 8052 equipment, and embedded automation controllers. The 36 I/O lines provide useful connection density for switches, displays, sensors, actuators, and external bus devices in compact industrial control boards.
A principal design consideration is the 5 V supply and the need to confirm clock, reset, memory-access, and peripheral connections against the manufacturer pin-description table. Designers should preserve the intended oscillator and decoupling arrangements, keep high-current outputs away from sensitive inputs, and budget timing margin when using the 40 MHz clock rating in a specific system.
This product page consolidates the verified core specifications, package information, family alternatives, application guidance, and design considerations for engineers evaluating the W78ERD2A40FL. The comparison section emphasizes where closely related W78 devices differ in clock speed, while the practical notes focus on firmware migration, peripheral planning, decoupling, and PCB implementation.
ドロップイン代替品: W78ERD2A40FL — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
W78ERD2A30FL
✅ ドロップイン📋 参考代替品（カタログ未掲載）
W78ERD2A20FL
✅ ドロップイン📋 参考代替品（カタログ未掲載）
W78ERD2A40FL 最大定格＆電気的特性
| Product Type | 8-bit CMOS microcontroller |
| Core Compatibility | 8052 instruction-set compatible |
| Maximum Operating Frequency | 40 MHz |
| Program Memory Size | 64 KB (64K x 8) |
| Program Memory Type | Flash |
| Boot Block Size | 4 KB |
| RAM Size | 1.25 KB (1.25K x 8) |
| Number of I/O | 36 lines |
| I/O Port Configuration | Four 8-bit I/O ports |
| Port 0 Internal Pull-Ups | Enabled by software |
| 電源電圧 | 5 V |
| パッケージ | 44-BQFP |
| 実装タイプ | Surface mount |
| Programmable Counter Array | Supported |
| Process Technology | 6T |
| Power-Down Mode | Supported without affecting the processor |
| Lead-Free Status | Lead-free |
W78ERD2A40FL 44-bqfp ピン配置ガイド
W78ERD2A40FL (44-bqfp パッケージ) のピン配置。 このデジタルICには、GPIO、通信インターフェース (UART、SPI、I2C)、および電源ピンが含まれています。代替ピン機能と設定オプションについては、メーカーのデータシートを参照してください。組み込みシステム設計とPCBレイアウトに不可欠です。
詳細なピン配置データはありません: W78ERD2A40FL.
詳細は データシート をご参照ください。
主な用途
W78ERD2A40FL の用途: 6 件s: Industrial Keypad and Panel Control, Programmable Timer and Event Controller, Small Motor and Actuator Control, Data Acquisition Front End, Legacy 8052 Equipment Upgrade, Embedded Automation Controller.
Industrial Keypad and Panel Control
The W78ERD2A40FL fits keypad, selector, and operator-panel controllers because its 40 MHz 8052-compatible core provides processing headroom while four 8-bit ports supply 36 usable I/O lines. Software-controlled Port 0 pull-ups simplify open-drain-style bus interfaces where appropriate. A typical design scans switch matrices, drives indicators, handles debouncing, and communicates with a supervisor controller. The 64 KB flash and 1.25 KB RAM provide room for interface tables and state logic, while the 44-BQFP keeps the controller compact. Confirm pin multiplexing, oscillator routing, and external bus timing against the family datasheet before finalizing the board.
おすすめ
Programmable Timer and Event Controller
The W78ERD2A40FL is appropriate for timing and event-control systems that benefit from both a 40 MHz clock and a dedicated Programmable Counter Array. The PCA can support repeated timing, capture, and event-oriented operations while the 8052-compatible core handles sequencing and communications. Thirty-six I/O lines allow the controller to combine input capture, outputs, status lamps, and an external interface. Its 64 KB flash supports event tables and firmware updates, while power-down mode can reduce activity during long idle periods. The exact PCA channels, interrupt vectors, and alternate pin functions must be assigned from the manufacturer pin and peripheral tables.
おすすめ
Small Motor and Actuator Control
The W78ERD2A40FL can serve as the supervisory controller in compact motor or actuator modules where deterministic 8052-family timing and numerous digital I/O lines are more important than a high-precision analog control loop. Its 40 MHz processing speed supports state-machine execution, position counting, fault latching, and communication with a dedicated power stage. The four 8-bit ports provide enough parallel connectivity for limit sensors, step-command signals, enable lines, and status feedback. Use the Programmable Counter Array for compatible timing tasks, but keep high-current switching and protection circuitry outside the MCU package.
おすすめ
Data Acquisition Front End
The W78ERD2A40FL is suitable as a digital front end for sensors and converters that produce serial or parallel data requiring local control, buffering, and protocol handling. The 40 MHz clock allows efficient acquisition loops and communication routines, while 36 I/O lines can carry sensor selects, converter strobes, data buses, and status signals. Its 64 KB flash can hold calibration tables and protocol handlers, and the 1.25 KB RAM supports short frame buffers. The MCU should remain separate from high-energy analog paths; use suitable signal conditioning, grounding, and isolation according to the transducer interface and environmental requirements.
おすすめ
Legacy 8052 Equipment Upgrade
The W78ERD2A40FL is useful for maintaining or modernizing equipment built around 8052-class firmware because it supports the standard 80C52 instruction set and the 80C52 pin-compatible architecture. Engineers can retain application logic while using 64 KB flash, a 4 KB boot block, and a 40 MHz clock. The 44-BQFP package supports conventional surface-mount assembly, and four 8-bit ports preserve familiar I/O organization. Migration still requires register-level peripheral checks, boot-memory consideration, oscillator validation, and a complete pin assignment check rather than assuming every legacy timing behavior is unchanged.
おすすめ
Embedded Automation Controller
The W78ERD2A40FL fits small automation controllers that coordinate sensors, relays, indicators, and communications over multiple digital ports. Its 40 MHz 8052-compatible core can implement control algorithms while the Programmable Counter Array handles compatible repetitive timing tasks. The 64 KB program memory supports structured application code, and power-down mode can lower activity when the controller is waiting for an external event. A robust design should include hardware reset, supply filtering, watchdog or supervisory support where available, and safe output states. Verify available watchdog, communications, and interrupt resources directly from the family documentation.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: W78ERD2A40FL — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | W78ERD2A30FL | W78ERD2A20FL |
|---|---|---|---|
| Package | 44-BQFP | 44-BQFP | 44-BQFP |
| Brand | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation |
| Maximum Operating Frequency | 40 MHz | 30 MHz | 20 MHz |
| Clock Difference from Target | 40 MHz | 10 MHz lower, 25% reduction | 20 MHz lower, 50% reduction |
| Processor Architecture | 8-bit 8052-compatible CMOS microcontroller | W78ERD2A family 8-bit microcontroller | W78ERD2A family 8-bit microcontroller |
主な差別化要因
- Highest verified clock rating in the identified W78ERD2A alternatives （vs W78ERD2A30FL)
- More processing headroom than the 20 MHz family option （vs W78ERD2A20FL)
- Established 64 KB flash configuration （vs W78ERD2A30FL)
設計ノート
Do not treat the 30 MHz and 20 MHz W78ERD2A family alternatives as automatic substitutes in a timing-critical 40 MHz design. Review baud-rate generation, timer reload values, sampling intervals, bus-cycle assumptions, and busy-wait loops because changing the clock ratio can alter real-time behavior. Reconfirm memory configuration, boot-block use, peripheral availability, and package pin assignments in the manufacturer documentation before releasing a substitution.
Route the 5 V supply and ground using a low-impedance distribution network, place local decoupling close to the device power pins, and avoid sharing narrow return paths with switching loads. Keep clock, reset, and high-speed serial routes away from noisy motor and relay wiring. The 44-BQFP footprint needs careful fan-out routing, but pin-assignment work should be based on the official pin-description table because the package drawing alone does not define peripheral functions.
The W78ERD2A40FL is intended for a 5 V supply and includes a power-down mode for reduced activity during idle periods. Design the supply for the device's specified current and transient requirements, including margin for attached I/O loads. Use reset and brownout behavior appropriate to the application, and ensure every externally connected pin cannot drive the MCU beyond its allowable voltage during reset or power-down states.
Assign the four 8-bit ports and PCA functions only after checking alternate peripheral mappings. Software-controlled Port 0 pull-ups can support compatible bus arrangements, but external pull-ups and signal loading still require electrical review. For mixed analog and digital designs, partition sensitive inputs from relay, power-converter, and communication circuits, use a deliberate grounding strategy, and test edge rates and ringing with a high-bandwidth probe at the actual MCU pins.
コンプライアンス情報
The Nuvoton product listing identifies the W78ERD2A40FL as lead-free. Separate RoHS, REACH, AEC-Q100, halogen-free, and conflict-minerals declarations are not stated in the available product information.
