W78IRD2A25PL - 25MHz 8-Bit Flash MCU | Nuvoton
Référence : W78IRD2A25PL ✓ ActifW78IRD2A25PL Présentation
An 8-bit microcontroller is a compact processor and integrated control device built around an 8-bit data bus. The W78IRD2 belongs to the broader hierarchy of embedded MCU, microprocessor, integrated circuit and semiconductor products. Its 80C52-compatible instruction set and pin arrangement allow engineers to reuse software and board-design practices developed for the standard 80C52 while gaining in-system Flash program update capability.
The W78IRD2 contains a 64 KB Flash EPROM and an auxiliary 4 KB Flash boot block. A loader program can update the main program memory in-system, supporting firmware upgrades and production programming. The device also includes a Programmable Counter Array, identified by Mouser as PCA, and two software-selectable power-reduction modes: idle mode, which stops the processor clock while peripherals continue operating, and power-down mode, which stops the crystal oscillator for minimum power consumption.
The architecture is organized around an 8-bit CPU operating at up to 25 MHz. Its 64K by 8 Flash organization provides substantially more program space than many basic 8051 controllers, while the 1.25K by 8 RAM area supports working variables, stack operations and buffered data. The 36 I/O pins give the device useful parallel-interface capacity for control signals, status indicators, communications and external peripheral connections.
Typical uses include industrial controllers, data-acquisition equipment, keypad interfaces, motor and relay control, legacy 80C52 equipment upgrades and compact embedded platforms. In-system Flash updating is especially useful for field-programmable industrial systems where firmware revisions are required without replacing the microcontroller.
When laying out the PCB, use the 44-pin PLCC footprint and verify every signal against the manufacturer pin description table. Place decoupling capacitors close to the power pins and route the oscillator network to minimize pickup. Confirm the external memory, reset and interrupt requirements for the complete design before committing the board layout.
This product page consolidates the core electrical specifications, package information, functional constraints, application guidance and verified sourcing references for the W78IRD2A25PL. It also distinguishes documented device characteristics from features that require board-level or firmware validation before production release.
Alternatives de remplacement direct pour W78IRD2A25PL — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Aucune alternative de remplacement direct disponible pour ce produit.
Demander des alternativesW78IRD2A25PL Valeurs maximales et caractéristiques électriques
| Product Type | 8-bit Flash Microcontroller |
| CPU Compatibility | 80C52 instruction-set compatible |
| Maximum Clock Speed | 25 MHz |
| Program Memory Size | 64 KB (64K x 8) |
| Auxiliary Flash Boot Block | 4 KB |
| RAM Size | 1.25 KB (1.25K x 8) |
| Number of I/O Lines | 36 lines |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Boîtier | 44-pin PLCC |
| Type de montage | Surface mount |
| Program Memory Type | Flash EPROM |
| Programming Method | In-system update by loader program |
| Peripheral | Programmable Counter Array (PCA) |
| Low-Power Modes | Idle mode and power-down mode |
| Plage de température de fonctionnement | -40 °C to +85 °C |
| Largeur du bus de données | 16 bit |
Guide de configuration des broches du W78IRD2A25PL 44-pin plcc
Configuration des broches du W78IRD2A25PL (boîtier 44-pin plcc). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour W78IRD2A25PL.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
W78IRD2A25PL convient pour 6 applications: Legacy 80C52 Controller Upgrade, In-System Firmware Update, Industrial Data Acquisition, Keypad and Panel Interface, Relay and Motor Control, Communication Equipment.
Legacy 80C52 Controller Upgrade
The W78IRD2A25PL fits upgrades that must retain an established 80C52 hardware and software foundation. Its 25 MHz clock, 36 I/O lines and 80C52-compatible instruction set support controlled migration of existing controller logic without changing the processor architecture. The 64 KB Flash program area is substantially more useful than a small ROM-only controller for protocol handling, diagnostics and control code. Because the manufacturer documents pin and instruction-set compatibility with the standard 80C52, designers can reuse much of the existing application software. Hardware qualification should still confirm timing, peripheral registers, reset behavior and board-level signal integrity before production release.
In-System Firmware Update
The W78IRD2A25PL is well suited to field-updatable equipment because it combines 64 KB of main Flash with a separate 4 KB Flash boot block. The manufacturer datasheet describes a loader program in the boot block that can update the main program memory in-system. This architecture allows a controlled firmware revision process without removing the controller from the assembled product. For industrial or instrumentation systems, the update routine should include power-fail protection, image validation and recovery procedures. The 2.7 V to 5.5 V operating range also supports design flexibility across common embedded supply levels.
Industrial Data Acquisition
With 36 I/O lines and a 25 MHz clock, the W78IRD2A25PL can coordinate digital sensors, status indicators, relay outputs and a serial data path in compact industrial acquisition equipment. Its 1.25 KB RAM is sufficient for short working buffers, sampled status variables and protocol framing in appropriately designed applications, while the 64 KB Flash area supports acquisition routines and diagnostics. Use the available I/O pins for discrete channels and interface signals, and allocate serial functions according to the pin table. Timing margin and interrupt latency should be verified against the sampling requirements during firmware validation.
Keypad and Panel Interface
The W78IRD2A25PL can serve as the controller for a keypad, display-selection panel or operator interface in equipment with modest user-control requirements. Its 36 I/O lines provide ample parallel connections for matrix scanning, indicator control and panel multiplexing, while the 25 MHz clock supports responsive debouncing and menu processing. The 80C52-compatible software model simplifies reuse of established keypad routines and display-driver code. Board planning should include adequate debounce filtering, protection for external contacts and clean separation between keypad nets and sensitive analog circuitry.
Relay and Motor Control
The W78IRD2A25PL is appropriate for small embedded control systems that coordinate relays, solenoids or simple motor-control logic. The 36 I/O lines can handle command, feedback and interlock signals, while the 25 MHz processor supports deterministic control-loop calculations and fast peripheral servicing. The idle mode stops the processor clock but permits peripherals to continue operating, which can help reduce processing activity between control events. Power-down mode stops the crystal oscillator when minimum consumption is required. Appropriate driver transistors, protection networks and isolation components should be designed separately according to the load characteristics.
Communication Equipment
The W78IRD2A25PL can support compact protocol-handler and communications-controller functions where an 8-bit architecture and moderate program memory are sufficient. Its 64 KB Flash area can hold protocol drivers, configuration handling and diagnostics, while the available I/O pins support serial functions and hardware handshaking. The 2.7 V to 5.5 V supply range permits integration across legacy 5 V systems and lower-voltage designs, subject to the clock and peripheral requirements of each configuration. Validate baud-rate tolerance, interrupt timing, line-driver levels and connector isolation in the final communications subsystem.
Données de référence d'ingénierie pour W78IRD2A25PL — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit |
|---|---|
| Product Type | 8-bit Flash Microcontroller |
| Maximum Clock Speed | 25 MHz |
| Program Memory Size | 64 KB (64K x 8) |
| Auxiliary Flash Boot Block | 4 KB |
| RAM Size | 1.25 KB (1.25K x 8) |
| Number of I/O Lines | 36 lines |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Operating Temperature Range | -40 °C to +85 °C |
| Package | 44-pin PLCC |
| Brand | Nuvoton Technology Corporation |
| CPU Compatibility | 80C52 instruction-set compatible |
| Special Peripheral | Programmable Counter Array (PCA) |
Principaux différenciateurs
- Substantially larger Flash program space than a basic ROM-only 80C52 design (vs Standard 80C52 controller)
- Maintains an established 80C52-compatible software baseline (vs Standard 80C52 controller)
- Higher documented clock rate with substantial parallel I/O capacity (vs 20 MHz W78IRD2A25PL listing)
Notes de conception
Use the 44-pin J-lead PLCC footprint and confirm pin-1 orientation against the package drawing before releasing artwork. Place the required supply-decoupling capacitors close to the power pins and keep the ground-return paths short. Because the PLCC body sits above the board, inspect the assembled package for solder bridges between closely spaced J-leads, particularly around adjacent I/O and power pins.
Keep the crystal or oscillator network and its ground return close to the oscillator pins, and avoid routing high-current switching traces beneath this area. Use a continuous ground plane where practical and place input protection devices away from sensitive clock and reset nodes. The 25 MHz operating speed allows switching-edge energy to couple into nearby traces, so maintain practical spacing between oscillator, reset and high-current power paths.
Do not assume that an 80C52-compatible instruction set guarantees a zero-risk replacement. Compare the complete pin-description table, interrupt priorities, timer and serial behavior, memory organization, reset levels and peripheral register definitions. Also verify the operating voltage and maximum clock against the original design; the documented 2.7 V to 5.5 V range and 25 MHz maximum are constraints, not guarantees for every peripheral mode.
Design firmware to use idle mode when peripheral operation must continue while the processor clock is stopped, and reserve power-down mode for situations in which the crystal oscillator may be halted. Account for wake-up timing and peripheral state restoration in the control sequence. Validate both modes across the intended voltage and temperature ranges rather than inferring current consumption from processor-clock activity alone.
Informations de conformité
The W78IRD2/W78IRD2A datasheet confirms the operating temperature range, but it does not provide the RoHS, REACH, AEC-Q100, lead-free, halogen-free or conflict-minerals declarations required for a complete compliance determination.