W78L801A24LL 8-Bit 8051 MCU, 4KB ROM, 48-LQFP | Nuvoton
부품 번호: W78L801A24LL ✓ 활성W78L801A24LL 개요
A microcontroller is a semiconductor device that integrates a CPU core, program memory, data memory, I/O ports, and peripherals into one package. The W78L801A24LL belongs to the 8051 microcontroller family, which is a CISC-based embedded-processing platform used in appliances, industrial controllers, access equipment, meters, and small automation systems. Its 4KB mask ROM provides a fixed program area for embedded control logic, while the 48-pin LQFP provides a substantial number of external signal connections for digital interfaces and control functions.
The key identifiable specifications are the 8-bit CPU architecture, 4KB MROM, 48-pin LQFP package, and 2.5 V, 3.3 V, or 5 V supply options. A distributor listing also identifies the device as an active Nuvoton part and classifies it as a QFP-48 package. The product is associated with an operating-frequency entry of 24 MHz in one listing and 20 MHz in another; the applicable maximum clock for the exact ordering code must therefore be confirmed against the manufacturer datasheet before clock-tree or timing design is finalized.
Typical embedded uses include keypad-controlled industrial panels, compact appliance controllers, fan and pump sequencers, digital instrumentation, LED status and drive systems, and small peripheral-control boards. The 8051 instruction set is appropriate when the application favors a mature software ecosystem and deterministic peripheral control over a larger CPU core, larger RAM, high-speed connectivity, or extensive analog conversion resources.
Design planning should begin with the manufacturer pin-description table, oscillator requirements, reset behavior, I/O ratings, and memory map. Confirm the exact clock limit, RAM capacity, peripheral set, input thresholds, and output-drive limits before finalizing the schematic. A 48-pin LQFP also requires a land pattern that matches the manufacturer's package drawing, including exposed-pad and thermal-copper requirements where applicable.
This product page consolidates the verified package, memory, architecture, supply-voltage, lifecycle, and sourcing information into an engineering-oriented reference. It also distinguishes confirmed device attributes from parameters that require direct datasheet verification and avoids presenting generic cross-reference listings as guaranteed drop-in replacements.
드롭인 대체품: W78L801A24LL — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 제품에는 사용 가능한 드롭인 대체품이 없습니다.
대체품 요청W78L801A24LL 최대 정격 & 전기적 특성
| CPU Architecture | 8-bit 8051 CISC |
| Program Memory | 4 KB MROM |
| Package Type | 48-pin LQFP |
| Package Dimensions | 7 mm x 7 mm |
| 실장 유형 | Surface mount |
| Nominal Supply Voltage Options | 2.5 V, 3.3 V, or 5 V |
| Listed Clock Frequency | 24 MHz |
| Program Memory Type | Mask ROM (MROM) |
| ADC | No |
| Address Bus Width | 16 bit |
| 수명 주기 상태 | Active |
| RoHS 상태 | Yes |
| REACH Compliance | Compliant |
| Manufacturer | Nuvoton Technology Corporation |
| Component Category | Embedded Microcontroller |
W78L801A24LL 7 mm x 7 mm 핀 구성 가이드
W78L801A24LL(7 mm x 7 mm 패키지)의 핀 구성입니다. 이 디지털 IC에는 GPIO, 통신 인터페이스(UART, SPI, I2C), 전원 핀이 포함되어 있습니다. 대체 핀 기능과 구성 옵션은 제조사 데이터시트를 참조하십시오. 임베디드 시스템 설계와 PCB 레이아웃에 필수적입니다.
다음에 대한 상세 핀아웃 데이터 없음: W78L801A24LL.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
W78L801A24LL 적합 용도: 6 애플리케이션s: Compact Industrial Control Panels, Appliance Sequencing and Motor Control, Digital Instrumentation and Metering, LED Status and Indicator Systems, Embedded Peripheral Controllers, Access and Security Control Modules.
Compact Industrial Control Panels
The W78L801A24LL is suitable for compact control-panel logic that uses digital inputs, indicator outputs, sequencing, and a modest fixed program. Its 8-bit 8051 architecture and 4KB MROM can support established embedded-control routines, while the 48-pin LQFP provides numerous external signal connections compared with a smaller controller package. Before schematic release, verify the exact port count, operating-temperature grade, input thresholds, output-drive ratings, and maximum clock for the ordering code. A 24 MHz listing identifies a possible clock configuration, but it must be reconciled with the manufacturer datasheet before timing and communication designs are finalized.
추천
Appliance Sequencing and Motor Control
The W78L801A24LL can be evaluated for appliance functions such as operating-state sequencing, relay logic, pump timing, fan control, and interlock management. Its fixed 4KB program area is best suited to compact control firmware rather than feature-heavy user-interface code. The 48-pin LQFP also gives the designer access to more I/O than a minimal 8- or 14-pin MCU. Confirm whether the exact device includes timers, external interrupts, PWM outputs, and the required I/O functions, then check startup, brownout, and pin-level limits against the appliance power-supply environment.
추천
Digital Instrumentation and Metering
The W78L801A24LL is applicable to simple digital instruments that gather switch or sensor-status inputs and drive displays, alarms, or communication outputs. The mature 8051 programming model can simplify migration of legacy measurement-control code, and 4KB MROM is adequate for focused state machines and calibration tables. Because the listed device has no ADC, analog measurement channels require external sensing and conversion circuitry. Confirm the required timer accuracy, RAM budget, serial-interface resources, display-driver ports, and clock behavior before selecting this MCU for a new metering platform.
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LED Status and Indicator Systems
The W78L801A24LL can coordinate LED status indicators, annunciators, and simple sequencing functions where the controller must read commands and update multiple outputs. The 48-pin package offers enough physical connectivity to separate control and display signals, while the 8-bit CPU is suitable for deterministic indicator logic. The exact timer and PWM resources must be checked to determine whether LED dimming can be handled directly or requires external drivers. Also verify output current, duty-cycle behavior, and polarity at the configured 2.5 V, 3.3 V, or 5 V operating point.
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Embedded Peripheral Controllers
The W78L801A24LL may serve as the supervisory controller in a compact peripheral, coordinating operating modes, status inputs, and outputs to other circuit blocks. Its small 7 mm by 7 mm LQFP footprint supports space-constrained assemblies, and the fixed MROM can hold a controlled boot and operating routine. Designers should confirm whether the exact part includes the required serial interface, timers, interrupts, and port directions. If the system relies on a host bootloader or field update, verify whether MROM alone satisfies the update architecture before committing to the device.
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Access and Security Control Modules
The W78L801A24LL can be considered for access-control modules that monitor inputs, manage lock or relay outputs, and implement a fixed control routine. The 8051 architecture is common in established access and security equipment, which can simplify reuse of compatible code and toolchains. Because security-sensitive products require strict validation, confirm the available code-execution protection, memory behavior, clock accuracy, watchdog functions, and reset strategy. The 4KB MROM also limits application complexity, so the design should separate simple I/O control from cryptographic or networked functions that may require a more capable MCU.
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추천 제품 요약
엔지니어링 참조 데이터: W78L801A24LL — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 |
|---|---|
| CPU Architecture | 8-bit 8051 CISC |
| Program Memory | 4 KB MROM |
| Package | 48-pin LQFP, 7 mm x 7 mm |
| Brand | Nuvoton Technology Corporation |
| Listed Supply Voltage Options | 2.5 V, 3.3 V, or 5 V |
| Listed Clock Frequency | 24 MHz |
| ADC | No |
| Address Bus Width | 16 bit |
| Lifecycle Status | Active |
주요 차별점
- Compact 8051 integration in a 48-LQFP footprint (vs No verified drop-in alternative)
- Three listed nominal supply-voltage options (vs No verified drop-in alternative)
- Active lifecycle with fixed mask-program architecture (vs No verified drop-in alternative)
설계 노트
Do not use the frequency values from reseller snippets interchangeably. One listing identifies 24 MHz, while another reports a 20 MHz maximum. Treat 24 MHz as a listed operating point and confirm the exact maximum clock, oscillator arrangement, and timing limits in the manufacturer datasheet for W78L801A24LL. A wrong clock assumption can invalidate baud-rate calculations, timer periods, and worst-case execution-time reviews.
Use the manufacturer LQFP-48 land pattern and verify all dimensions against the package drawing. Place the decoupling network and oscillator components close to their associated pins, maintain a short return path for supply connections, and provide adequate ground-plane continuity beneath the device. Because the available listings do not provide individual pin names, complete the PCB schematic and pin-assignment review only from the official pin-description table.
Select the supply rail from the device's supported 2.5 V, 3.3 V, or 5 V operating points after checking the complete electrical table. The I/O thresholds, internal supply behavior, reset levels, and output-current ratings must match the board's logic family and load requirements. Use local bulk and high-frequency decoupling, and validate startup and brownout behavior across the intended power-source tolerance before production release.
Keep sensitive analog or sensor-related traces away from switching nodes and high-current relay or motor paths, although this MCU itself has no ADC. If the MCU controls an external converter or driver, route its enable, fault, and feedback traces away from inductive components. Maintain consistent grounding between the MCU and any external communication or display circuitry, and review unused pins according to the manufacturer recommendations rather than assuming every unused pin may float.
규정 준수 정보
The product listing explicitly states RoHS Yes and REACH compliant. AEC-Q100 qualification, lead-free status, halogen-free status, and conflict-minerals compliance are not identified in the available product information.