W78L032A24FL - 8-Bit 24MHz ROMless MCU | Nuvoton
部品番号: W78L032A24FL ✓ 生産中W78L032A24FL 概要
A microcontroller is a compact embedded-processing system that integrates a CPU core, memory, peripherals, and I/O into one semiconductor package. The W78L032A24FL belongs to the 8-bit microcontroller hierarchy within integrated circuits and embedded processors. Its ROMless architecture requires application firmware to be stored externally, separating the execution program from the MCU package while retaining fast access to on-chip RAM and peripherals.
The principal operating characteristics verified for this device include a 24 MHz maximum speed, a 1.8 V to 5.5 V operating-voltage range, 256 x 8 bits of RAM, 32 I/O lines, and an internal oscillator. These parameters position the device for compact embedded-control tasks where an 8-bit CPU and modest RAM are sufficient. The 32 available I/O pins also allow the controller to connect sensors, indicators, communication interfaces, and discrete actuators without requiring a large external peripheral set.
The W78L032A24FL is ROMless rather than internally program-memory-equipped. Designers must therefore provide code memory and ensure that the external memory interface, address decoding, power sequencing, and firmware-loading arrangement are correct. Although the supplied sources confirm the 24 MHz rating, voltage range, RAM organization, I/O count, and 44-BQFP package, detailed peripheral assignments and complete electrical limits require the manufacturer datasheet for final design verification.
Typical implementation areas include compact industrial controllers, keypad interfaces, simple sensor-conditioning systems, building-control equipment, appliance controllers, and low-cost embedded automation modules. The device is particularly appropriate when the control loop does not require a high-performance 32-bit processor or large on-chip flash. Its 32 I/O lines simplify parallel input/output designs, while external program memory allows firmware size to scale independently of the MCU package.
A key engineering consideration is the distinction between a valid nominal replacement and a true drop-in replacement. The verified data confirms the target package and basic electrical characteristics but does not identify a pin-compatible alternative with a complete, verified pinout and matching memory interface. Engineers should therefore avoid treating family members with different package suffixes or tape-and-reel order codes as drop-in equivalents without a documented manufacturer pin comparison.
This page consolidates verified distributor specifications, sourcing links, application guidance, and design cautions that are not presented together in a single manufacturer document. It also distinguishes confirmed facts from parameters that still require review against the datasheet, providing a practical starting point for MCU selection and procurement.
ドロップイン代替品: W78L032A24FL — 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。
この製品に利用可能なドロップイン代替品はありません。
代替品をリクエストW78L032A24FL 最大定格＆電気的特性
| Product Type | 8-bit ROMless microcontroller |
| Manufacturer | Nuvoton Technology Corporation |
| Architecture | W78 / 80C32 family |
| Maximum CPU Frequency | 24 MHz |
| Operating Voltage Range | 1.8 V to 5.5 V |
| Program Memory | External ROMless implementation |
| RAM Size | 256 x 8 bits |
| Number of I/O Pins | 32 |
| パッケージ | 44-pin BQFP |
| Oscillator Type | Internal oscillator |
| 実装タイプ | Surface mount |
| Datasheet File Size | 262 KB |
| Datasheet Page Count | 18 pages |
| Datasheet Publication Date | 2016-05-11 |
W78L032A24FL 44-pin bqfp ピン配置ガイド
W78L032A24FL (44-pin 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: W78L032A24FL.
詳細は データシート をご参照ください。
主な用途
W78L032A24FL の用途: 6 件s: Compact Industrial Control Module, Appliance Controller, Sensor Interface and Data Acquisition, Building Automation Controller, Keypad and Human Interface Controller, Simple Communication Gateway.
Compact Industrial Control Module
The W78L032A24FL fits compact control modules because it combines a verified 24 MHz 8-bit processor with 32 I/O pins and a 1.8 V to 5.5 V operating range. Those resources can support digital inputs, relay or transistor outputs, status indicators, and local sequencing without a larger processor. Its ROMless architecture allows application firmware to be held in external program memory, which can simplify lifecycle updates in equipment that must retain code independently of the MCU. The primary engineering trade-off is the modest 256 x 8-bit RAM, so control algorithms and buffering must remain bounded. Production selection should also verify the device's temperature rating, ESD performance, and any industrial qualification requirements from the manufacturer datasheet.
おすすめ
Appliance Controller
The W78L032A24FL is suitable for appliance controllers that coordinate keypad inputs, display segments, motors, heaters, and discrete status signals. Its verified 32 I/O pins reduce the need for external I/O expanders, while the 1.8 V to 5.5 V supply range accommodates common low-voltage embedded rails. The 24 MHz maximum operating speed is appropriate for event-driven motor and thermal-control logic rather than intensive computation. Because the device is ROMless, designers should account for external code storage, address decoding, and firmware update requirements. A cost-constrained design should also confirm whether its 256 bytes of RAM are adequate for task state, display buffering, and communication handling.
おすすめ
Sensor Interface and Data Acquisition
The W78L032A24FL can act as the local controller for modest sensor-interfaces and data-acquisition assemblies when sampled signals require digital filtering, thresholding, or logging. Its verified 24 MHz clock supports deterministic acquisition and control-loop tasks, while 32 I/O pins provide digital control and status connections alongside external analog or serial sensing hardware. The 1.8 V to 5.5 V operating range is useful for mixed-voltage embedded systems. The principal limitation is the 256 x 8-bit RAM, which requires buffered data to be processed promptly or transferred to external storage. ADC characteristics, timer resolution, interrupt latency, and serial-interface details must be confirmed from the complete manufacturer datasheet.
おすすめ
Building Automation Controller
The W78L032A24FL is appropriate for small building-automation nodes that monitor discrete inputs and control lighting, HVAC actuators, or access equipment. The verified 32 I/O pins permit multiple field signals to be consolidated in one controller, and the 1.8 V to 5.5 V supply range supports low-voltage distributed electronics. Its 8-bit architecture and 256-byte RAM are best suited to local coordination rather than protocol-heavy gateways. External program memory can facilitate field firmware upgrades, but system designers must plan for update security, power-loss recovery, and watchdog behavior. Compliance and environmental suitability depend on the exact installation site and are not established by the supplied distributor excerpts.
おすすめ
Keypad and Human Interface Controller
The W78L032A24FL can manage keypad scanning, display control, and menu-state handling in compact human-interface devices. Its verified 24 MHz operating speed is more than adequate for polling digital inputs and updating simple displays, while 32 I/O lines can connect matrix inputs and segmented or multiplexed outputs. The broad 1.8 V to 5.5 V range supports integration with common logic levels. With 256 x 8 bits of RAM, the design should avoid large display buffers or elaborate graphics, and the external program-memory arrangement must accommodate firmware size. Exact timing, interrupt, and I/O capabilities should be reviewed in the manufacturer datasheet before assigning pin-sensitive resources.
おすすめ
Simple Communication Gateway
The W78L032A24FL can serve as a low-cost communication gateway when the local interface traffic and protocol state fit an 8-bit processor with 256 bytes of RAM. It may bridge simple serial or parallel devices to a local bus, perform basic address and command translation, and provide status indicators through its 32 I/O lines. The verified 24 MHz maximum frequency supports routine serial processing, while the 1.8 V to 5.5 V supply range simplifies integration across common rails. Protocol buffering and concurrent-channel limitations remain important trade-offs. Engineers must verify the available serial peripherals, baud-rate support, interrupt behavior, and external-memory timing before claiming interoperability with a particular network.
おすすめ
エンジニアリング参考データ: W78L032A24FL — 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 |
|---|---|
| Package | 44-pin BQFP |
| Brand | Nuvoton Technology Corporation |
| Architecture | 8-bit W78 / 80C32 |
| Maximum CPU Frequency | 24 MHz |
| Operating Voltage Range | 1.8 V to 5.5 V |
| Program Memory | External, ROMless |
| RAM Size | 256 x 8 bits |
| Number of I/O Pins | 32 |
| Oscillator Type | Internal oscillator |
主な差別化要因
- Verified 32 I/O count in an 8-bit control-class device （vs No verified drop-in alternative was identified)
- Broad confirmed low-voltage operating range （vs No verified drop-in alternative was identified)
- ROMless architecture with external program-memory flexibility （vs No verified drop-in alternative was identified)
設計ノート
Use the manufacturer package drawing and complete pin table before assigning signals or routing the 44-pin BQFP footprint. The verified excerpts establish the package and pin count but do not provide a complete pin map, so NC, power, ground, reset, clock, and programming assignments must be transcribed from the datasheet. Keep sensitive clock or programming routes away from noisy switching nodes and preserve the manufacturer-recommended decoupling connections. A PCB that is based on a family diagram rather than the exact suffix can create boot, programming, or analog-noise failures.
Design the supply network for the verified 1.8 V to 5.5 V operating range and place local high-frequency bypassing close to the device's supply and ground pins. The supplied excerpts do not specify decoupling values, absolute maximum voltage, or power-consumption limits, so those values must be taken from the manufacturer datasheet rather than assumed. Because the MCU is ROMless, external program-memory current and bus transitions may influence the power budget. Validate startup, reset release, and supply sequencing across the minimum and maximum specified operating voltages.
Do not treat W78L032A24FL, W78L032A24FL-TR, or another suffix as interchangeable without checking the order code and package. The cross-reference search found the tape-and-reel ordering form, but a packaging variant is not a distinct drop-in alternative. Similarly, membership in the W78 or 80C32 family does not prove identical pinout, memory timing, or peripheral behavior. For any proposed replacement, compare the exact package drawing, electrical limits, clock scheme, reset logic, programming interface, and external program-memory requirements.
コンプライアンス情報
The supplied distributor and datasheet-index excerpts do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Obtain current declarations for the exact ordered part and package.
