W79E825AW - 8-Bit MCU, 16KB ISP Flash, 18 I/O Ports | Nuvoton
N.º da peça: W79E825AW ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $1.85 | $1,85 |
| 10 | $1.62 | $16,20 |
| 100 | $1.38 | $138,00 |
| 500 | $1.18 | $590,00 |
| 1.000 | $0.99 | $990,00 |
W79E825AW Visão geral
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile RAM, and peripheral interfaces into one package; 8-bit MCUs such as the W79E825AW remain widely used in cost-sensitive embedded designs where the processing workload (sensing, key handling, simple state machines, motor pulse trains) fits comfortably within an 8-bit data path. Within the broader semiconductor taxonomy, an MCU belongs to the microcontrollers sub-category of Integrated Circuits, sitting above Logic ICs and beneath microprocessors in capability. The 4T core architecture positions the W79E825AW for one-instruction-per-four-clock operation, providing up to several MIPS per MHz depending on the selected clock source.
Key features of the W79E825AW include ISP Flash that supports in-application firmware updates without removing the part from the board, a configurable 4-/2-channel 10-bit PWM block for motor or LED control, a 10-bit ADC that can be routed to multiple I/O pins, and a Brown-out / Watchdog combination for unsupervised recovery from power or code faults. The four-level interrupt controller lets time-critical events preempt background tasks, and the Enhanced UART supports 9-bit address-mode communications for RS-485 multi-drop networks.
Typical applications include white-goods control boards, low-end motor drives, simple sensor hubs, IR remote transceivers, and consumer-electronic user-interface modules. The 18 I/O budget covers keypad scanning, LED driving, and small display interfaces without external expanders.
When designing with this part, leave at least one UART accessible as a serial debug / ISP window and verify the ISP entry sequence against the In-System Programming section of the manufacturer datasheet to avoid lock-out conditions.
Alternativas drop-in para W79E825AW — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
W79E825ASN
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
W79E832ADG
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
N79E825ASG
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
N79E825ASG
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
W79E825ASG
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
W79E825AW Classificações máximas e características elétricas
| Core Architecture | 8-bit CMOS, 4T (4 clocks per instruction cycle) |
| Program Memory (Flash) | 16 KB ISP Flash EPROM |
| Data Memory (RAM) | 256 bytes on-chip SRAM |
| Data Flash NVM | 256 bytes on-chip |
| I/O Ports | 18 multi-function I/O |
| Timers / Counters | 2 × 16-bit |
| Interrupt Sources | 13 sources, 4 priority levels |
| UART | 1 Enhanced full-duplex |
| I2C | 1 channel |
| PWM Channels | 4 channels, 10-bit |
| ADC | 4 channels, 10-bit (multiplexed) |
| Watchdog Timer | Programmable |
| On-chip Oscillator | Yes (internal clock circuitry) |
Guia de Configuração de Pinos do W79E825AW standard
Configuração de pinos para W79E825AW (pacote standard). 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 W79E825AW.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
W79E825AW é adequado para 6 aplicaçãos: Home Appliance Control Boards, Small Motor / DC-Fan Speed Control, IR Remote Control & Consumer IR Receivers, Sensor Hub / Data-Logger Front End, User-Interface Keypad / Display Modules, RS-485 Sensor / Multi-Drop Slave Nodes.
Home Appliance Control Boards
The W79E825AW fits home-appliance control boards including washing-machine sub-modules, microwave key/display controllers, and rice-cooker / induction-cooker user-interface boards. Its 16 KB ISP Flash accommodates small RTOS-less state machines plus menu/parameter storage, while 256 bytes of on-chip data Flash NVM preserve user-set timings across power cycles. Four channels of 10-bit PWM drive buzzer tones and LED backlight dimming without external timers, and the 4-channel 10-bit ADC reads temperature sensors or potentiometers directly. The 18 I/O budget easily covers a 4x4 keypad matrix plus a multiplexed 7-segment display, and the Enhanced UART enables diagnostic links to factory test rigs or to a higher-level display main-board - reducing BOM cost for the appliance tier below $1.50 per control module.
Recomendado
Small Motor / DC-Fan Speed Control
For brushed-DC fans, vibration pumps, and small unipolar stepper motor control the W79E825AW offers the right mix of PWM and ADC without excess. Four 10-bit PWM channels drive up to four low-side or H-bridge gate signals for two small DC motors or one bipolar stepper; the four-channel 10-bit ADC multiplexes back-EMF or shunt-sense feedback to close a software PI loop. The Enhanced UART relays motor telemetry (RPM, current, fault codes) to a host controller, while ISP Flash permits field firmware updates for tuning PID gains per motor lot. Compared with a 32-bit Cortex-M0, the W79E825AW cuts BOM cost in cost-sensitive consumer fans, but cannot handle sinusoidal BLDC or FOC algorithms above a few hundred Hz electrical.
Recomendado
IR Remote Control & Consumer IR Receivers
In IR remote controls and consumer IR learning receivers the W79E825AW's 256-byte SRAM, single Enhanced UART, and 13 interrupts with four-level priority cover RC5/RC6/ NEC protocol decoding along with low-power standby operation. The 4T core decodes edge timings of 9-13 kHz carrier bursts deterministically; 256 bytes of on-chip data Flash NVM store learned device codes across battery swaps. The 18 I/O budget drives multiple LED indicators plus a 3x4 keypad matrix, and ISP Flash allows factory re-flashing of protocol tables without disassembling the remote. Compared with dedicated IR-decoder ASICs, this part gives the manufacturer the flexibility to add features (e.g., RF4CE gateway logic) by repacking firmware rather than re-spinning an ASIC.
Recomendado
Sensor Hub / Data-Logger Front End
In simple sensor-hub and data-logger front ends the W79E825AW aggregates 1-4 analog sensors through its 4-channel 10-bit ADC and forwards results over I2C or UART to a host processor. Its 256-byte SRAM buffers short bursts of samples; the on-chip data Flash stores calibration coefficients; and ISP Flash supports remote firmware updates for sensor-fusion changes. The Watchdog timer recovers from sensor-noise-induced hangs, important for unattended sensors in industrial areas. Compared with discrete AFE + microcontroller solutions, this part integrates ADC + MCU + NVM into one die, reducing footprint and BOM in retrofit sensor modules.
Recomendado
User-Interface Keypad / Display Modules
For keypad-plus-display sub-assemblies the W79E825AW supplies the timing and I/O budget to scan up to an 8x8 button matrix (or smaller) and drive a multiplexed character LCD or 7-segment display. The 18 I/O pins are more than sufficient for the keypad columns/rows plus a 4-common/8-segment display; the timer/counter provides precise multiplexed refresh without CPU overhead; and the 256-byte SRAM holds debounce buffers. ISP Flash enables late-stage menu customization without reflashing the master MCU. Compared with LED-driver companion ICs, this part eliminates a chip and reduces BOM cost.
Recomendado
RS-485 Sensor / Multi-Drop Slave Nodes
In RS-485 multi-drop sensor networks the W79E825AW acts as a slave node responding to a Modbus/RTU master. The Enhanced UART supports the 9-bit address-mode required by Modbus, and the 13 interrupts with four priority levels keep the address-matching latency low. The programmable Watchdog Timer resets the node if the master goes silent for too long, and ISP Flash allows in-field firmware upgrades via the same UART. Compared with isolated RS-485 transceiver solutions, this MCU adds node-level compute without adding a separate logic device, keeping each remote node under $2 BOM.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para W79E825AW — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | W79E825ASN | W79E832ADG | N79E825ASG | W79E825ASG |
|---|---|---|---|---|---|
| Brand | Nuvoton (formerly Winbond) | Nuvoton | Nuvoton | Nuvoton | Nuvoton |
| Core Architecture | 8-bit, 4T | 8-bit, 4T | 8-bit, 4T | 8-bit, 4T | 8-bit, 4T |
Principais diferenciais
- ISP Flash on same die as 256 B NVM data flash (vs N79E825ASG)
- Enhanced UART with 9-bit address-mode support (vs W79E832ADG)
- 13 interrupts in a four-level priority scheme (vs N79E825ASG)
Notas de projeto
When laying out the W79E825AW PCB, place a 0.1 µF decoupling capacitor within 5 mm of each VDD pin and a bulk capacitor (4.7 µF or larger) on the regulator output. The device's ISP programming sequence relies on a specific reset-state pattern on designated pins; if external reset or brown-out circuitry holds the device in a non-ISP state, in-system firmware updates can be locked out until the next power cycle.
Route any ADC analog input traces away from PWM or digital switching lines; crosstalk of more than 20 mV from a PWM edge into the 10-bit ADC input reduces the dynamic range by at least 3 LSB at 5 V VDD. A grounded guard ring around the ADC pin plus a small RC filter (1 kΩ + 100 pF) at the input yields ~10 dB improvement in noisy environments like brushed-motor PCBs.
Estimated: at 5 V VDD with all peripherals active and CPU running at the maximum oscillator rate, the W79E825AW draws roughly 5-10 mA (exact figure depends on the chosen clock mode and active peripheral count). For battery-backed designs, gate the W79E825AW supply with an external load switch controlled from a host MCU to drop standby current to the µA range when the device is not actively scanning or transmitting.
Informações de conformidade
RoHS, REACH, lead-free, and halogen-free status for the W79E825AW were not stated explicitly in the verified web data; request the latest material declaration from Nuvoton (or its franchised distributor) before designing the part into any product with substance-restriction requirements.
