W79E9781AKG - 8-bit MCU 64KB Flash | Nuvoton | Industrial
MPN: W79E9781AKG ✓ Hoạt độngW79E9781AKG Tóm tắt
An 8-bit microcontroller (MCU) is a microprocessor-on-a-chip that integrates a CPU, program memory, data RAM, and peripherals into a single IC. The 8-bit architecture is optimized for cost-sensitive, low-power, deterministic control tasks; in the system hierarchy an MCU sits between discrete logic ICs and 32-bit microprocessors, providing firmware-driven I/O handling, sensor interfacing, and protocol conversion. Nuvoton's W79 family extends the legacy 8051 instruction set with Turbo-MCU enhancements, doubling the standard clock-per-instruction cycle for higher throughput at the same crystal frequency.
Key features include 64 KB of in-system programmable (ISP) Flash allowing field firmware updates via UART, an operating voltage range of 2.4V to 5.5V that supports both 3.3V and 5V rails, and an industrial-grade operating temperature of -40C to +85C. The on-chip 10-bit ADC provides up to 8 analog input channels, while the four 16-bit timer/counters support PWM generation, capture, and event counting. A dedicated hardware watchdog and brown-out reset circuit protect against code lockup and unstable supplies.
The W79E9781AKG uses the standard 8051 instruction set with Nuvoton Turbo-MCU extensions, allowing one machine cycle per clock rather than the original 12, while preserving binary compatibility with legacy 8051 firmware. The device's ISP mechanism boots from a ROM-resident bootloader that re-programs the Flash via the UART pins, eliminating external programming hardware during prototyping and field service.
Typical applications include industrial control panels, home appliance main boards, motor control BLDC drivers, smart meter data concentrators, and point-of-sale terminals. The integrated ADC, timers, and UART let designers replace multiple discrete components with a single chip, shrinking BOM cost and PCB area.
When designing with this device, plan ISP access by routing the UART pins to a header or optocoupler-isolated connector. Use the brown-out detector level matched to the lowest reliable rail voltage (typically 2.7V for 3.3V systems) to prevent Flash corruption during power-down events.
This page consolidates distributor pricing, package-level drop-in alternatives, and engineering design notes that go beyond the manufacturer datasheet, supporting faster component selection and risk-aware substitution decisions.
Bộ thay thế dễ dàng lắp đặt cho W79E9781AKG — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
W79E9783AKG
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
W79E9791AKG
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
W79E6325AKG
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
W79E9781AKG Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit 8051 (Turbo-MCU) |
| Instruction Set | 8051-compatible with Nuvoton extensions |
| Program Memory (Flash) | 64 KB |
| SRAM | 1.25 KB |
| Operating Voltage Range | 2.4 V to 5.5 V |
| Tần số xung maksimum | 40 MHz |
| ADC | 10-bit, up to 8 channels |
| Timers | 4 x 16-bit |
| Watchdog Timer | Yes |
| Brown-Out Detector | Yes |
| UART | 1 x hardware full-duplex |
| I2C / SPI | I2C master + SPI master |
| Nhiệt độ hoạt động | -40 C to +85 C |
| Hộp | LQFP-128 |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| In-System Programming | Yes (UART bootloader) |
Hướng dẫn cấu hình chân W79E9781AKG lqfp-128
Cấu hình chân cho W79E9781AKG (lqfp-128 gói). IC số này bao gồm chân GPIO, giao diện truyền thông (UART, SPI, I2C) và chân nguồn. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết các chức năng chân thay thế và tùy chọn cấu hình. Cực kỳ quan trọng cho thiết kế hệ thống tích hợp và lập trình PCB.
Không có dữ liệu chân cụ thể sẵn có cho W79E9781AKG.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
W79E9781AKG phù hợp cho 6 Áp dụngs: Industrial Control Panels, Home Appliance Main Boards, BLDC Motor Drivers, Smart Meter Data Concentrators, Point-of-Sale Terminals, Sensor Hubs and IoT Edge Nodes.
Industrial Control Panels
The W79E9781AKG fits industrial control panels because its 64 KB ISP Flash and 1.25 KB SRAM handle menu-driven HMI logic, while the 10-bit ADC reads analog sensor inputs such as temperature and pressure. The wide 2.4-5.5V supply tolerates noisy 24V-derived industrial rails after regulation, and the -40C to +85C operating temperature covers factory floor environments. The hardware watchdog and brown-out detector protect against code lockup and supply sag, critical for unattended control cabinets.
Được đề xuất
Home Appliance Main Boards
The W79E9781AKG suits home appliance main boards - washing machines, microwave ovens, and air conditioners - where its 8051-compatible core simplifies firmware reuse across product lines. The four 16-bit timers drive PWM outputs for motor and heater control, while the hardware UART links to display modules or Wi-Fi companion modules. ISP via UART allows field firmware updates without disassembly, a strong advantage for appliance OEMs managing long product lifecycles.
Được đề xuất
BLDC Motor Drivers
The W79E9781AKG supports low-to-mid complexity BLDC motor drivers by using its 16-bit timers to generate 3-phase complementary PWM with dead-time insertion, and its 10-bit ADC to sample back-EMF for sensorless commutation. The 40 MHz Turbo-MCU core provides enough headroom for trapezoidal or simple sinusoidal control loops. The integrated brown-out detector prevents erratic motor behavior during supply transients common in motor inrush events.
Được đề xuất
Smart Meter Data Concentrators
The W79E9781AKG can serve as the local data concentrator in smart-meter networks, gathering pulses from electricity/water/gas meters and forwarding aggregated data via the hardware UART to a cellular or PLC modem. The 64 KB Flash accommodates DLMS/COSEM or proprietary metering stacks, while the watchdog timer guards against meter hangs. The industrial -40C to +85C rating handles outdoor meter cabinet conditions.
Được đề xuất
Point-of-Sale Terminals
The W79E9781AKG handles the keyboard, display, and printer interface in low-cost point-of-sale terminals where cost dominates over raw processing speed. Its UART links to a mag-stripe or smartcard reader, its I2C/SPI master drives an LCD or thermal printer controller, and ISP via UART allows secure firmware updates at deployment sites. The 5V-tolerant I/O simplifies interfacing with legacy POS peripherals.
Được đề xuất
Sensor Hubs and IoT Edge Nodes
The W79E9781AKG can act as an edge sensor hub aggregating analog and digital sensors and forwarding pre-processed data via UART to a higher-level gateway. The 10-bit ADC samples multiple sensor channels, the timers schedule periodic wake-and-measure cycles, and the brown-out detector preserves node state across brown-out events. ISP enables OTA-style field updates when paired with a companion wireless module.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho W79E9781AKG — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | W79E9783AKG | W79E9791AKG | W79E6325AKG |
|---|---|---|---|---|
| Brand | Nuvoton | Nuvoton | Nuvoton | Nuvoton |
| Package | LQFP-128 | LQFP-128 - same | LQFP-128 - same | LQFP-128 - same |
| Core | 8-bit 8051 Turbo | 8-bit 8051 Turbo | 8-bit 8051 Turbo | 8-bit 8051 |
Bảo phân biệt quan trọng
- Wide 2.4V to 5.5V supply range (vsW79E6325AKG)
- Integrated ISP UART bootloader (vsGeneric 8051 MCUs)
- 64 KB Flash on a 40 MHz Turbo-MCU core (vsW78E052D)
Ghi chú thiết kế
The W79E9781AKG operates from 2.4V to 5.5V; place a 10uF bulk capacitor plus a 0.1uF ceramic decoupling cap close to the VDD pins to suppress switching transients. Use the on-chip brown-out detector set to the minimum reliable rail voltage (e.g., 2.7V for a 3.3V system) to prevent Flash corruption during power-down events.
Route the ISP UART pins (TX, RX) to a header or optocoupler-isolated connector so that firmware can be updated in-circuit. Keep the UART traces short and away from switching power or motor driver traces to avoid bootloader-mode glitches during field programming.
Estimated: total Flash endurance is typically rated at 100K erase/write cycles - design firmware update flows to minimize unnecessary writes and avoid using Flash as a high-write-rate log. The watchdog timer must be refreshed periodically in firmware; failure to refresh will reset the device.
Thông tin tuân thủ
RoHS compliant per Nuvoton product page. Standard variant is not AEC-Q100 qualified; for automotive choose the Q1 suffix variant. Halogen-free status not explicitly stated in provided data.
