W77L516A25FL - 25MHz 64KB 8051 MCU | Nuvoton | Embedded Control
MPN: W77L516A25FL ✓ NakahandaW77L516A25FL Ulas
An 8051 microcontroller is a compact CISC-based control processor that integrates CPU registers, program memory, data memory, and peripherals into one device. Its place in the product hierarchy is microcontroller → embedded processor → programmable controller → semiconductor. The W77L516A25FL combines the widely established 8051 instruction set with on-chip Flash, making it suitable for products that benefit from legacy 8051 code compatibility while requiring a modern nonvolatile program-memory implementation.
Key features include a 25 MHz operating speed, 64 KB of Flash organized as 64K x 8, 1 KB of SRAM organized as 1K x 8, and 36 I/O lines. The operating-voltage listing spans 2.7 V to 5.5 V, while another technical listing identifies 4.5 V as a relevant operating-voltage value. The device also includes an internal oscillator according to the component specifications. These characteristics position it for compact embedded controllers, industrial automation modules, and cost-sensitive control products with moderate processing requirements.
The W77L516A25FL belongs to Nuvoton's W77 series and retains an 8-bit MCU architecture rather than using a 32-bit core. Flash memory allows firmware to be stored without an external program-memory device, reducing the component count in a finished controller. The 36 available I/O pins provide substantial interface capacity for digital inputs, outputs, indicators, and external control signals, although the exact peripheral multiplexing must be assigned from the manufacturer pin-description table.
Typical application areas include industrial equipment interfaces, data-collection terminals, programmable control panels, building automation equipment, and compact embedded control modules. A 25 MHz clock provides useful processing headroom for 8051-based supervisory tasks, state machines, communication routines, and peripheral coordination. The 44-pin package also leaves a broader interface budget than many smaller microcontroller packages while remaining compact enough for embedded boards.
When laying out a W77L516A25FL board, begin with the manufacturer pin-description table and assign every power, ground, reset, clock, and I/O connection explicitly. Confirm the operating rail required by the selected design, decouple each supply connection locally, and route oscillator and sensitive signals away from high-current switching nodes. The 8051 architecture is mature, but firmware timing, peripheral selection, and pin multiplexing must still be checked against the device documentation.
This product page consolidates the core electrical specifications, package information, sourcing details, application guidance, and engineering considerations into a concise engineering reference. It is intended to help designers identify whether the W77L516A25FL's Flash memory, 25 MHz speed, 36 I/O pins, 44-pin BQFP package, and 8051 compatibility fit an embedded-control design.
Mga alternatibo na pwedeng ilagay na W77L516A25FL — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Wala ng magagamit na drop-in alternatibo para sa produkto na ito.
Hilingin ang AlternatiboW77L516A25FL Mga Pinakamataas na Rating at Electrical Characteristics
| Product Type | 8-bit 8051 W77 Flash Microcontroller |
| Architecture | 8051-compatible CISC |
| Maksimum na Taktiko ng Oras | 25 MHz |
| Program Memory Size | 64 KB (64K x 8) Flash |
| Internal RAM Size | 1 KB (1K x 8) |
| Number of I/O Pins | 36 pins |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Named Operating Voltage | 4.5 V |
| Voltage Class | 3.3 V / 5 V |
| Hanay ng Temperature na Operasyon | 0 °C to +70 °C |
| Packhaging | 44-pin BQFP |
| Package Body Size | 10 mm x 10 mm |
| Uri ng Pagpapasok | Surface Mount |
| Oscillator | Internal oscillator |
| Program Memory Type | Built-in Flash |
| Series | W77 Series |
| Tindminan RoHS | Compliant |
Gabay sa Pin Configuration ng W77L516A25FL 10 mm x 10 mm
Pin configuration para sa W77L516A25FL (10 mm x 10 mm package). Kasama sa digital IC na ito ang GPIO, mga communication interface (UART, SPI, I2C), at mga power pin. Sumangguni sa datasheet ng manufacturer para sa mga alternatibong function ng pin at mga opsyon sa configuration. Mahalaga para sa disenyo ng embedded system at PCB layout.
Wala ng detalyadong pinout data na magagamit para sa W77L516A25FL.
Sumangguni sa datasheet para sa buong pin configuration.
Tipikal na mga Gamit
W77L516A25FL ay nararapat para sa 6 aplikasyons: Industrial Equipment Interface Controller, Programmable Control Panel, Data Collection Terminal, Building Automation Module, Legacy 8051 Firmware Upgrade, Compact Embedded Control Module.
Industrial Equipment Interface Controller
The W77L516A25FL fits supervisory control in industrial equipment where an established 8051 instruction set, 64 KB of Flash, and 36 I/O lines simplify hardware integration. It can coordinate limit switches, status indicators, relay logic, and operator inputs without external program memory. The 25 MHz clock supports state-machine and protocol-handling tasks, while the 44-pin BQFP provides ample signal routing. Validate industrial temperature requirements because the listed W77L516A25FL operating range is 0 °C to +70 °C.
Programmable Control Panel
The W77L516A25FL is suitable for a programmable control panel requiring buttons, LEDs, displays, and external control signals. Its 36 I/O pins can support multiple digital inputs and outputs, while 64 KB of internal Flash provides room for menu logic, operating states, and communication handling. The 8051-compatible core also enables reuse of mature control firmware. Confirm each multiplexed peripheral function and pin assignment in the manufacturer datasheet before assigning panel signals.
Data Collection Terminal
The W77L516A25FL can serve as the embedded controller in a compact data-collection terminal that gathers digital sensor states and forwards summarized information to a host. Its 25 MHz core is appropriate for supervisory acquisition, filtering, and packet handling, and the 1 KB internal RAM supports working variables and short buffers. Use the 36 I/O lines for sensors and status signals, but plan communication buffering carefully because the internal RAM is limited to 1 KB.
Building Automation Module
The W77L516A25FL fits a building-automation module that supervises lighting, HVAC requests, occupancy inputs, and communication interfaces. The 8051-compatible architecture supports compact embedded firmware, while 36 I/O lines provide practical connectivity for discrete controls. Its 2.7 V to 5.5 V listed supply range allows integration with common embedded rails, subject to per-rail limits in the manufacturer datasheet. Use a robust regulator and local bypass capacitors to maintain stable control operation.
Legacy 8051 Firmware Upgrade
The W77L516A25FL offers a path to retain established 8051-compatible software while moving program storage onto 64 KB of internal Flash. This is useful when a mature controller has stable logic but needs a more integrated implementation. The 25 MHz operating speed and 1 KB of internal RAM should be checked against interrupt latency, stack depth, and buffer requirements. A firmware migration still requires peripheral and timing verification because software compatibility does not guarantee identical hardware behavior.
Compact Embedded Control Module
The W77L516A25FL works in compact embedded modules that coordinate sensors, actuators, and local status feedback without a high-end processor. Its 44-pin BQFP package provides 36 I/O lines, and the internal Flash eliminates the need for a separate program-memory device. The 25 MHz core is suitable for deterministic supervisory loops and simple protocol routines. Keep the oscillator path short, place bypass capacitance at the supply pins, and assign unused I/O lines according to the manufacturer pin-description table.
Impormasyon ng Talumpati sa Engineering for W77L516A25FL — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto |
|---|---|
| Package | 44-pin BQFP |
| Brand | Nuvoton Technology Corporation |
| Microcontroller Architecture | 8-bit 8051-compatible |
| Maximum Clock Frequency | 25 MHz |
| Program Memory | 64 KB built-in Flash |
| Internal RAM | 1 KB |
| Number of I/O Pins | 36 |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Operating Temperature Range | 0 °C to +70 °C |
| Oscillator | Internal oscillator |
Pangunahing mga Pagkakaiba
- Integrated Flash simplifies standalone controller hardware (kumpara saLegacy 8051 devices requiring external program memory)
- Substantial interface capacity for an 8-bit MCU (kumpara saSmaller 8-bit microcontrollers with fewer I/O pins)
- 25 MHz performance within the 8051-compatible family (kumpara saLower-frequency legacy 8051 controllers)
- Compact 44-pin surface-mount integration (kumpara saLarger through-hole 8051 packages)
Talaan ng Disenyo
Place input and output bypass capacitors close to their associated supply pins, and route the ground return through a low-impedance plane. The 25 MHz clock requirement makes oscillator traces especially sensitive to long loops and nearby switching currents. Follow the manufacturer layout guidance for decoupling, grounding, and signal routing, and verify the complete 44-pin netlist against the pin-description table before fabrication.
Design the supply for the W77L516A25FL using the 2.7 V to 5.5 V device range while checking each electrical limit against the manufacturer datasheet. Add local high-frequency bypass capacitance and use a regulator with adequate transient response for digital and switching loads. Confirm whether the selected I/O bank operates from VDD or a separate voltage because level compatibility depends on the actual supply connections.
Do not treat a 44-pin BQFP outline as proof of pin compatibility. The 8051 family includes devices with similar packages but different peripheral assignments, reset functions, oscillator pins, and programming interfaces. For a redesign or replacement, compare the pin-description table, memory map, interrupt sources, and startup behavior. The 1 KB internal RAM also requires explicit stack and buffer budgeting for the chosen firmware.
Keep the oscillator and reset paths away from noisy switching nodes and route sensitive inputs away from parallel high-current traces. Although this is an 8-bit 8051-compatible controller rather than a high-speed digital interface, clock jitter, supply noise, and marginal input thresholds can still create timing faults. Use the manufacturer-recommended clock configuration and test startup, reset release, and peripheral timing across the expected supply range.
Impormasyon ng Pagsunod sa Kautusan
The component listing identifies the W77L516A25FL as RoHS compliant. No separate REACH, lead-free, halogen-free, or conflict-minerals declaration was identified.
