W78I054DFG - 8-Bit 40MHz 8052 MCU | Nuvoton
N.º de pieza: W78I054DFG ✓ ActivoW78I054DFG Descripción general
An 8-bit 8052-compatible microcontroller is a semiconductor that combines a small CPU core, program flash, data memory, timers, serial interfaces, and I/O in one integrated device. In the product hierarchy, the W78I054DFG is a microcontroller, or MCU, within integrated circuits and embedded processing. It is intended for compact control systems where 8-bit computation, deterministic peripheral access, and a 5 V-class supply are more useful than high bandwidth or 32-bit processing.
Key features visible in the verified distributor data include a 40 MHz maximum clock, 16 KB flash memory, 256 bytes of memory, 2.4 V to 5.5 V operation, and a 44-pin PQFP package. Pb-free construction is also stated. These characteristics make the device suitable for industrial control, appliance control, instrumentation interfaces, and legacy-compatible embedded products. Conflicting distributor snippets report either 16 KB or 32 KB flash, so engineers should confirm the density and memory map against the exact Nuvoton datasheet before production release.
The W78-series architecture follows the established 8052 instruction-set framework while providing a modern integrated implementation in the W78I054DFG. At 40 MHz, the MCU can service multiple timers, serial communication tasks, and discrete I/O operations within one compact device. Its 44-pin PQFP format provides substantially more I/O than an 8-pin package, supporting applications that require multiple digital inputs, outputs, interrupt signals, and communication interfaces.
Typical application areas include industrial machine controllers, measurement instruments, temperature-control panels, serial data collectors, programmable logic controllers, and compact appliance controllers. In these systems, the MCU can execute a control loop, scan inputs, drive outputs, communicate with sensors, and enforce timing using its integrated peripherals. The 2.4 V to 5.5 V range supports 3.3 V and 5 V system rails when peripheral levels and timing requirements are compatible.
Designers should confirm memory size, pin multiplexing, clock configuration, peripheral availability, and electrical limits directly from the manufacturer datasheet before layout is frozen. A 44-pin PQFP requires adequate board area, fine-pitch assembly capability, and careful decoupling. Firmware migration should also account for peripheral differences between the original W78I054 and any replacement candidate rather than relying only on matching package names.
Alternativas directas para W78I054DFG — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
No hay alternativas directas disponibles para este producto.
Solicitar alternativasW78I054DFG Valores máximos y características eléctricas
| Product Type | 8-bit microcontroller (MCU) |
| Architecture | 8052-compatible 8-bit core |
| Frecuencia de reloj máxima | 40 MHz |
| Flash Memory | 16 KB according to Hotenda, Jotrin, and LCSC snippets; 32 KB according to Mouser snippet |
| Reported Internal Memory | 256 bytes according to LCSC snippet |
| Operating Voltage Range | 2.4 V to 5.5 V |
| Supply Category | Pb-free |
| Rango de temperatura de funcionamiento | -40°C to +85°C |
| Encapsulado | 44-pin PQFP (44-PQFP) |
| Recuento de pines | 44 pins |
| Tipo de montaje | Surface-mount PQFP |
| Ancho del bus de datos | 8 bits |
| Program Memory Organization | 16K × 8 according to distributor listing |
| Lead-Free Status | Pb-free |
Guía de configuración de pines de W78I054DFG 44-pin pqfp (44-pqfp)
Configuración de pines para W78I054DFG (encapsulado 44-pin pqfp (44-pqfp)). Este CI digital incluye GPIO, interfaces de comunicación (UART, SPI, I2C) y pines de alimentación. Consulte la hoja de datos del fabricante para conocer las funciones alternativas de los pines y las opciones de configuración. Esencial para el diseño de sistemas embebidos y el diseño de PCB.
No hay datos detallados de patillaje disponibles para W78I054DFG.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
W78I054DFG es adecuado para 6 aplicacións: Industrial Machine Control, Temperature-Control Instrument, Appliance Controller, Serial Data Collector, Programmable Logic Controller, Legacy 8052 System Upgrade.
Industrial Machine Control
The W78I054DFG fits compact industrial machine controllers that require an 8-bit control core, a 40 MHz operating rate, and numerous external connections. Its 44-pin PQFP package provides more I/O opportunities than a small 8-pin MCU, while the 2.4 V to 5.5 V supply range allows use with 3.3 V or 5 V control rails when peripheral compatibility is confirmed. An application can use the device for button and sensor scanning, actuator sequencing, timing, status indication, and host communication. The verified source data does not enumerate the W78I054DFG peripheral set, so the final design must confirm timer channels, serial interfaces, interrupt sources, and pin multiplexing in the Nuvoton datasheet. Firmware should also include validation for brownout conditions and watchdog behavior if those functions are available.
Temperature-Control Instrument
The W78I054DFG is appropriate for temperature controllers and compact measurement instruments where an 8-bit MCU can acquire a sensor signal, apply control logic, drive a display or relay, and communicate with an operator. The 40 MHz clock provides timing margin for periodic sampling and control tasks, while the 44-pin PQFP package offers enough pins for sensors, switches, indicators, and communications. Its stated 2.4 V to 5.5 V operating range supports common embedded supply rails, and the -40°C to +85°C rating is useful for equipment deployed beyond room temperature. Before selecting a sensor interface, confirm the available analog inputs, ADC characteristics, and peripheral assignment in the exact datasheet. Firmware must also define calibration, error handling, and safe output states when the controlled temperature is outside the intended range.
Appliance Controller
The W78I054DFG can serve as the central controller in a compact appliance by coordinating user inputs, relays or indicators, timers, and a serial communications link. Its 8052-compatible 8-bit architecture is well aligned with deterministic appliance-control logic, and the 40 MHz operating rate allows multiple peripheral tasks to share one processor. The 44-pin PQFP package is practical when the controller needs more discrete I/O than a compact 8-pin device provides, while the 2.4 V to 5.5 V range supports 3.3 V and 5 V implementations. Before board release, verify the exact pin alternate functions, flash density, and peripheral resources because distributor snippets disagree between 16 KB and 32 KB flash. The production firmware should include safe startup states and validated failure behavior for heaters, motors, or other energized loads.
Serial Data Collector
The W78I054DFG can be used in a small serial data-collection terminal that gathers readings from sensors, timestamps events, formats data, and forwards it to a host computer. The 40 MHz 8-bit core is sufficient for many supervisory tasks when the protocol workload is modest, and the 44-pin PQFP package provides pins for the serial interface, status indicators, configuration controls, and auxiliary logic. Its 2.4 V to 5.5 V operating range supports both 3.3 V and 5 V system domains, subject to I/O-level confirmation. The verified excerpts do not identify the available UART, timer, or data-memory resources, so engineers must verify peripheral counts and pin mappings before finalizing the architecture. A robust implementation should include frame-error recovery, configuration persistence, and brownout-safe firmware startup.
Programmable Logic Controller
The W78I054DFG is a plausible controller for small PLC-like modules that execute ladder-style logic, scan discrete inputs, coordinate outputs, and expose a service interface. The 8-bit 8052-compatible architecture supports compact deterministic control code, while 40 MHz operation provides useful timing headroom for communication and input-scanning tasks. With 44 pins, the device offers more external connectivity than smaller 8-bit packages and can support status LEDs, pushbuttons, relay drivers, and a serial programming port. The 2.4 V to 5.5 V range and -40°C to +85°C rating align with many industrial and commercial environments. Before placing the IC, confirm the exact I/O count, interrupt behavior, timer capabilities, and watchdog implementation from the manufacturer datasheet. Industrial qualification and surge testing should be handled separately from the component-level temperature rating.
Legacy 8052 System Upgrade
The W78I054DFG is relevant when maintaining or selectively updating an 8052-based embedded system that requires the specific Nuvoton W78I054 implementation. Its 8052-compatible core and 40 MHz clock can support legacy control logic with more timing headroom, while the 44-pin PQFP package may facilitate replacement of a similarly configured board. The 2.4 V to 5.5 V supply range provides compatibility with common 3.3 V and 5 V designs, subject to signal-level checks. Migration is not guaranteed solely from the processor family: the engineer must compare memory size, interrupt vectors, timer registers, serial interfaces, port registers, and every physical pin. The conflicting 16 KB and 32 KB flash claims in distributor listings make direct datasheet confirmation essential before recompiling legacy firmware.
Datos de referencia de ingeniería para W78I054DFG — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto |
|---|---|
| Product Type | 8-bit 8052-compatible microcontroller |
| Brand | Nuvoton Technology Corporation |
| Package | 44-pin PQFP (44-PQFP) |
| Maximum Clock Frequency | 40 MHz |
| Flash Memory | 16 KB according to Hotenda, Jotrin, and LCSC snippets; 32 KB according to Mouser snippet |
| Operating Voltage Range | 2.4 V to 5.5 V |
| Operating Temperature Range | -40°C to +85°C |
| Data Bus Width | 8 bits |
| Lead-Free Construction | Pb-free |
| Verified Unit Price | US$4.8913 as of 2026-10-30 |
Diferenciadores clave
- Specific 8052-family implementation (frente a W78E054DFG)
- Directly identified 44-pin PQFP option (frente a W78E054DFG)
- Verified commercial-channel availability (frente a W78E054DFG)
Notas de diseño
Treat the W78I054DFG as a 44-pin fine-pitch PQFP assembly and verify the land pattern, pin-1 orientation, solder-paste footprint, and courtyard against the manufacturer package drawing. Reserve clean routing space around all four sides and account for component height during enclosure design. Because the supplied data does not include individual pin names, the schematic and layout must not be released until every power, ground, clock, reset, I/O, and programming connection has been checked against the exact datasheet.
Design the supply rail for a nominal 2.4 V to 5.5 V operating envelope, but do not treat that range as permission for any transient or rail excursion outside the electrical limits in the datasheet. Place local supply and ground decoupling at the device pins, maintain a low-impedance return path, and verify startup and brownout behavior for systems that must recover without unpredictable outputs. The 40 MHz clock and exact core timing requirements should also be checked against the selected supply voltage before finalizing the power tree.
The principal purchasing and firmware risk is inconsistent memory information: Hotenda, Jotrin, and LCSC report 16 KB flash, while Mouser reports 32 KB. Do not size firmware, bootloaders, or memory-mapped peripherals until the exact density is confirmed from the Nuvoton document. Also verify whether the package is described as PQFP, LQFP, or QFP by a selected source; similar family members exist in multiple packages, and package naming alone does not establish pin compatibility.
Información de cumplimiento
The verified distributor listings identify W78I054DFG as Pb-free. The supplied data does not explicitly verify RoHS, REACH, AEC-Q100, halogen-free, or conflict-minerals status, so those fields remain unknown.
