W78E858A40FL - 40MHz 8052 8-Bit 32KB Flash | Nuvoton
N.º da peça: W78E858A40FL ✓ AtivoW78E858A40FL Visão geral
An 8-bit microcontroller is a compact embedded-control device that combines a processor core, program memory, data memory, peripheral interfaces, and I/O ports in one integrated circuit. The W78E858A40FL belongs to the W78 microcontroller family and is positioned for cost-sensitive embedded products requiring deterministic control, serial communication, counter and timer functions, and general-purpose digital I/O. Its 44-BQFP package provides a larger pin count than small-outline packages, allowing more external connections while remaining suitable for leaded or legacy-compatible PCB assembly.
The principal device characteristics are a 40 MHz operating speed, 32 KB of Flash program memory, 768 x 8 RAM, 36 I/O pins, and a 5 V operating condition as stated in the product listing. The Flash architecture supports firmware storage and reprogramming-oriented designs, while the boot block provides a separate code area for boot-related functions. The operating features should be confirmed against the manufacturer datasheet for peripheral allocation, electrical limits, clock configuration, programming, and package details before a new design is released.
Typical applications include industrial control panels, compact automation equipment, instrumentation, appliance controllers, communication modules, motor and relay-control systems, and general embedded products. The 36 I/O pins can support external sensing, actuator control, status indicators, and interface connections, while the 40 MHz CPU rate is useful for protocol handling and multi-peripheral control. A suitable design should provide stable 5 V supply decoupling and preserve the controller's reset, clock, and programming interfaces.
For new layouts, use the 44-BQFP footprint and pin assignment defined by the manufacturer datasheet. Confirm the exposed-pad and thermal requirements, programming connector arrangement, and unused-pin treatment during hardware review. The request-a-quote form on this page can provide current commercial availability and lead-time information for the W78E858A40FL.
Alternativas drop-in para W78E858A40FL — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Nenhuma alternativa drop-in disponível para este produto.
Solicitar alternativasW78E858A40FL Classificações máximas e características elétricas
| Product Type | 8-bit W78 8052 microcontroller |
| Operating Speed | 40 MHz |
| Program Memory Size | 32 KB (32K x 8) Flash |
| Boot Block | 4 KB |
| RAM Size | 768 x 8 |
| EEPROM | 128 bytes |
| Number of I/O | 36 |
| Encapsulamento / Caixa | 44-BQFP |
| Tensão de alimentação | 5 V |
| Processor Core | 8052 |
| Flash Memory | Program Flash |
| Lead-Free Status | Pb-free |
Guia de Configuração de Pinos do W78E858A40FL 44-bqfp
Configuração de pinos para W78E858A40FL (pacote 44-bqfp). Este CI digital inclui GPIO, interfaces de comunicação (UART, SPI, I2C) e pinos de alimentação. Consulte o datasheet do fabricante para funções alternativas dos pinos e opções de configuração. Essencial para projeto de sistemas embarcados e layout de PCB.
Nenhum dado detalhado de pinagem disponível para W78E858A40FL.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
W78E858A40FL é adequado para 6 aplicaçãos: Industrial Automation Controller, Appliance and Equipment Controller, Communication Module, Motor and Relay Control, Instrumentation and Data Acquisition, Programmable Logic Controller.
Industrial Automation Controller
The W78E858A40FL fits compact industrial automation controllers that combine digital control with limited analog monitoring. Its 36 I/O pins can connect sensors, relay drivers, status LEDs, interlocks, and actuator interfaces without requiring a large external I/O expander. The 40 MHz 8052 core supports deterministic control tasks and communication handling, while 32 KB of Flash provides room for application firmware and a separate 4 KB boot block. A 5 V supply architecture aligns with many industrial controller boards. Before layout release, verify peripheral assignments, electrical limits, operating temperature, reset behavior, and the exact 44-BQFP footprint in the manufacturer datasheet.
Recomendado
Appliance and Equipment Controller
The W78E858A40FL is suitable for appliance controllers that combine a state machine, user-interface indicators, and multiple discrete loads. Thirty-six I/O pins provide practical connectivity for buttons, displays, heaters, motors, and safety-related status signals. Its 32 KB Flash capacity is appropriate for moderate embedded firmware, while 768 x 8 RAM supports task variables and communication buffers. The 8052 architecture also suits teams familiar with classic 8-bit embedded tooling. Designers should confirm timer resources, port-drive limits, brownout behavior, and programming requirements in the datasheet, while the 44-BQFP package simplifies routing on larger legacy-style control boards.
Recomendado
Communication Module
The W78E858A40FL can act as the supervisory processor in a small communication module that needs protocol handling alongside general-purpose control. The 40 MHz 8052 core provides additional processing headroom, 32 KB of Flash stores firmware, and 36 I/O pins support status indicators, configuration inputs, and external interface signaling. The 4 KB boot block may support boot or update logic, subject to the device's documented memory map. Engineers should verify which UART, timer, and serial-interface resources are available, determine whether the chosen transceiver requires a different logic voltage, and implement the interface pins according to the manufacturer pin-description table.
Recomendado
Motor and Relay Control
The W78E858A40FL can coordinate motor-control sequencing, relay outputs, interlocks, and fault signals in compact electromechanical systems. Its 36 I/O pins reduce the need for a separate large I/O-expander device, while the 40 MHz core allows the firmware to coordinate timers, inputs, and protection logic. Flash memory is useful for storing operating sequences and diagnostics, and EEPROM can retain small configuration parameters. The controller should not directly drive inductive loads unless its output ratings and protection requirements meet the load conditions. Confirm timer channels, pin tolerances, output-current limits, isolation needs, and thermal margins before hardware design.
Recomendado
Instrumentation and Data Acquisition
The W78E858A40FL is appropriate for compact instrumentation front ends that need control, status reporting, and moderate local processing. The 36 I/O pins can support digital measurement inputs, calibration storage interfaces, display-control signals, and communication ports, while the 40 MHz processor supports sampling coordination and protocol formatting. Its 32 KB Flash provides useful code space for measurement routines, and the 768 x 8 RAM can hold working buffers. The device is not inherently a precision analog converter, so signal conditioning and an external ADC should be selected independently. Verify ADC availability if required, grounding strategy, timing accuracy, and noise performance in the system architecture.
Recomendado
Programmable Logic Controller
The W78E858A40FL can serve as the central MCU in a small programmable logic controller for machine control, building automation, or equipment interlock systems. Its 36 I/O pins provide a useful mix of digital inputs and outputs, and the 40 MHz 8052 core can execute scan logic, timers, communication services, and diagnostics. The 32 KB Flash supports a moderately sized program, while the separate 4 KB boot block provides room for controlled startup behavior. A production controller should include hardware reset, brownout monitoring, watchdog support, and carefully planned input filtering. Confirm the availability and limitations of each peripheral before assigning PLC-style functions to the device.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para W78E858A40FL — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto |
|---|---|
| Package | 44-BQFP |
| Brand | Nuvoton Technology Corporation |
| Architecture | 8-bit 8052 W78 |
| Maximum Speed | 40 MHz |
| Program Memory | 32 KB Flash |
| Boot Memory | 4 KB boot block |
| RAM | 768 x 8 |
| EEPROM | 128 bytes |
| Number of I/O | 36 |
| Supply Voltage | 5 V |
| Lead-Free Status | Pb-free |
Principais diferenciais
- Provides a documented 32 KB Flash configuration (vs MC908AP32CFBE)
- Uses a 44-BQFP package with 36 I/O pins (vs MC9S08GT32ACFBER)
- Combines a 40 MHz core with 768 x 8 RAM (vs MC908AP32CFBE)
Notas de projeto
Route the 44-BQFP footprint exactly from the manufacturer package drawing, including any exposed-pad connection and thermal requirements. Place the required 5 V decoupling capacitors at the nearest supply and ground pins, and keep the return path short. Confirm whether unused I/O pins require defined levels; do not leave programming, reset, clock, or boot-control pins unconnected.
Treat the W78E858A40FL as an 8052-compatible device, but do not assume that another 8-bit MCU is firmware- or pin-compatible. A replacement must be checked for the same 44-BQFP pin functions, clock architecture, memory map, peripheral registers, interrupt vector behavior, programming algorithm, and electrical limits. The cross-reference listings do not establish a drop-in substitute.
Provide a regulated 5 V source with the current headroom required by the controller and its external loads. The product listing identifies a 5 V device but does not specify maximum supply voltage, ripple tolerance, or operating current; use the manufacturer electrical-characteristics table for final rail design. Include bulk capacitance for local transients and high-frequency ceramic decoupling close to the package.
Separate sensitive analog or communication routes from switching-node and high-current load paths. Use a compact ground reference around the controller and route clocks, programming signals, and reset traces away from noisy relays or motor outputs. If an external crystal is used, follow the datasheet's recommended placement and grounding arrangement exactly.
Informações de conformidade
The Mouser product listing identifies the W78E858A40FL as Pb-free. RoHS, REACH, AEC-Q100, halogen-free, and conflict-minerals status are not established by the available product information.
