W79E352AFG - 8-bit 8051 MCU, 24MHz, 8KB Flash, 44-QFP | Nuvoton
MPN： W79E352AFG ✓ 啟用中W79E352AFG 概覽
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/Flash), data memory (RAM), and I/O peripherals into one package. The 8051 architecture, originally introduced by Intel in 1980 and now maintained by Nuvoton and others, sits within the broader hierarchy: microcontroller -> embedded processor -> digital IC -> semiconductor. The W79E352AFG belongs to Nuvoton's W79 series, optimized for cost-sensitive industrial control, home appliance, and motor drive front-ends.
Key features of the W79E352AFG include up to 36 general-purpose I/O pins, multiple communication interfaces (EBI/EMI, I2C, UART/USART), four 16-bit timer/counters, hardware PWM channels, and an in-system programmable (ISP) Flash that enables firmware upgrades without removing the device from the board. Operating voltage spans 2.4 V to 5.5 V, supporting both 3.3 V and 5 V system designs with a single device.
Technically, the part uses a single-cycle 8051 core that executes most instructions in 1 to 4 clocks (versus 12 in the original 8051), yielding roughly 4x to 12x higher effective MIPS than legacy designs. The integrated 4 KB auxiliary Flash area allows bootloader/ISP separation from the application code region. On-chip RC oscillator options reduce external BOM, and configurable GPIO drive strength simplifies interface to relays, MOSFETs, or 5 V peripheral logic.
Typical applications include BLDC and stepper motor control (using the PWM and timer modules), home appliances (washing machines, induction cookers, microwave ovens), industrial control boards, low-end sensor hubs, and replacement of legacy 8051 designs where pin compatibility, code compatibility, and an upgrade path to ISP Flash are required.
When designing in this part, reserve pin 30 (RST) for an external reset network and ensure the VDD-to-VSS decoupling is placed within 5 mm of the package. Designers moving from older Nuvoton N79E352ADG (44-DIP) parts can reuse existing firmware because the W79E352AFG shares the same SFR map.
This page synthesizes distributor pricing, drop-in alternatives, package diagrams, and practical design notes that complement the official Nuvoton datasheet for engineers migrating legacy 8051 designs or evaluating the W79 series for new industrial and appliance projects.
直接替換替代品，適用於 W79E352AFG — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
W79E352ADG
✅ 直接替換📋 參考替代品（不在目錄中）
W79E352RAFG
✅ 直接替換📋 參考替代品（不在目錄中）
N79E352AFG
✅ 直接替換📋 參考替代品（不在目錄中）
W78E052D
✅ 直接替換📋 參考替代品（不在目錄中）
W78E058D
✅ 直接替換📋 參考替代品（不在目錄中）
W79E352AFG 最大額定值與電氣特性
| Core Architecture | 8051 (MCS-51 compatible) |
| 資料匯流排寬度 | 8-bit |
| 最大時脈頻率 | 24 MHz |
| Program Memory Size | 8 KB (8K x 8) Flash |
| RAM Size | 256 bytes |
| 工作電源電壓 | 2.4 V to 5.5 V |
| Number of I/O Pins | 36 |
| 封裝 | 44-pin QFP |
| 安裝類型 | Surface Mount |
| Peripherals | Brown-out Detect/Reset, LVD, POR, PWM, WDT |
| Connectivity | EBI/EMI, I2C, UART/USART |
| Number of Timers | 4 x 16-bit |
| 工作溫度 | -40 C to +85 C |
| RoHS 狀態 | Compliant |
| Lead Free | Yes |
W79E352AFG 腳位配置
| 腳位 1 | P1.0/T2 — GPIO / Timer 2 external input |
| 腳位 2 | P1.1/T2EX — GPIO / Timer 2 trigger |
| 腳位 3 | P1.2 — General-purpose I/O |
| 腳位 4 | P1.3 — General-purpose I/O |
| 腳位 5 | P1.4 — General-purpose I/O |
| 腳位 6 | P1.5 — General-purpose I/O |
| 腳位 7 | P1.6 — General-purpose I/O |
| 腳位 8 | P1.7 — General-purpose I/O |
| 腳位 9 | RST — Reset input, active high |
| 腳位 10 | P3.0/RXD — GPIO / UART receive |
| 腳位 11 | P3.1/TXD — GPIO / UART transmit |
| 腳位 12 | P3.2/INT0 — GPIO / External interrupt 0 |
| 腳位 13 | P3.3/INT1 — GPIO / External interrupt 1 |
| 腳位 14 | P3.4/T0 — GPIO / Timer 0 external input |
| 腳位 15 | P3.5/T1 — GPIO / Timer 1 external input |
| 腳位 16 | P3.6/WR — GPIO / External data write strobe |
| 腳位 17 | P3.7/RD — GPIO / External data read strobe |
| 腳位 18 | XTAL2 — Crystal oscillator output |
| 腳位 19 | XTAL1 — Crystal oscillator input |
| 腳位 20 | VSS — Ground |
| 腳位 21 | P2.0/A8 — GPIO / Address bit 8 (EBI) |
| 腳位 22 | P2.1/A9 — GPIO / Address bit 9 (EBI) |
| 腳位 23 | P2.2/A10 — GPIO / Address bit 10 (EBI) |
| 腳位 24 | P2.3/A11 — GPIO / Address bit 11 (EBI) |
| 腳位 25 | P2.4/A12 — GPIO / Address bit 12 (EBI) |
| 腳位 26 | P2.5/A13 — GPIO / Address bit 13 (EBI) |
| 腳位 27 | P2.6/A14 — GPIO / Address bit 14 (EBI) |
| 腳位 28 | P2.7/A15 — GPIO / Address bit 15 (EBI) |
| 腳位 29 | PSEN — Program store enable (EBI) |
| 腳位 30 | ALE — Address latch enable (EBI) |
| 腳位 31 | EA/VPP — External access / Flash programming voltage |
| 腳位 32 | P0.7/AD7 — GPIO / EBI multiplexed data/address bit 7 |
| 腳位 33 | P0.6/AD6 — GPIO / EBI multiplexed data/address bit 6 |
| 腳位 34 | P0.5/AD5 — GPIO / EBI multiplexed data/address bit 5 |
| 腳位 35 | P0.4/AD4 — GPIO / EBI multiplexed data/address bit 4 |
| 腳位 36 | P0.3/AD3 — GPIO / EBI multiplexed data/address bit 3 |
| 腳位 37 | P0.2/AD2 — GPIO / EBI multiplexed data/address bit 2 |
| 腳位 38 | P0.1/AD1 — GPIO / EBI multiplexed data/address bit 1 |
| 腳位 39 | P0.0/AD0 — GPIO / EBI multiplexed data/address bit 0 |
| 腳位 40 | VDD — Positive supply voltage |
| 腳位 41 | P4.0 — General-purpose I/O / ISP |
| 腳位 42 | P4.1 — General-purpose I/O / ISP |
| 腳位 43 | P4.2 — General-purpose I/O |
| 腳位 44 | P4.3 — General-purpose I/O |
典型應用
W79E352AFG 適用於 6 應用s: Home Appliance Motor Control, Induction Cooker and Microwave Oven Controller, Industrial Sensor Hub and Front-End, Smart Metering and Energy Monitoring, Consumer Appliance Remote and Keypad Boards, Automotive Body and Comfort Modules (Non-Safety).
Home Appliance Motor Control
The W79E352AFG fits BLDC and single-phase induction motor control boards in washing machines, range hoods, and small pumps because of its 4 x 16-bit timers, hardware PWM channels, brown-out reset, and 2.4 V to 5.5 V supply tolerance. The 36 GPIOs can drive triac/MOSFET gate signals, read Hall sensors, and multiplex a 7-segment or LCD user interface. With 8 KB ISP Flash, firmware can be updated in the field without opening the appliance housing, a critical feature for after-sale service.
推薦
Induction Cooker and Microwave Oven Controller
Induction cookers and microwave ovens need a 5 V-tolerant 8051 MCU with strong EMC immunity, PWM for IGBT drive, and reliable resets during line transients. The W79E352AFG delivers all three through its LVD, brown-out detect, and 16-bit PWM timers running from a stable internal RC oscillator. The 8 KB Flash holds the safety logic, and the 256 B RAM is sufficient for the small state machines typical in cooker control firmware without requiring external SRAM.
推薦
Industrial Sensor Hub and Front-End
The W79E352AFG is a natural fit for industrial 4-20 mA / 0-10 V sensor front-ends and Modbus RTU over UART, where the 8051 core, I2C, and UART/USART peripherals let one device aggregate multiple sensors while remaining pin-compatible with legacy Nuvoton designs. Operating from 2.4 V to 5.5 V allows it to ride through industrial supply dips. The ISP Flash enables remote firmware updates across thousands of deployed hubs without truck rolls.
推薦
Smart Metering and Energy Monitoring
Single-phase energy meter designs use the W79E352AFG to compute RMS current/voltage, drive LCD segments, and report over UART or I2C. The brown-out reset and watchdog timer are critical for safety certifications, while 8 KB of Flash provides ample room for calibration constants and tamper detection logic. The 44-QFP package allows standard SMT lines to be used for high-volume meter production.
推薦
Consumer Appliance Remote and Keypad Boards
Remotes, washing-machine keypads, and air-conditioner wall modules typically use a low-cost 8051 with UART or I2C to talk to a main controller. The W79E352AFG fits perfectly: 36 GPIOs scan key matrices, the UART or I2C interface connects back to the main board, and the 2.4 V minimum supply supports 2 x AA battery operation with a simple LDO. ISP Flash simplifies late-stage firmware personalization per model SKU.
推薦
Automotive Body and Comfort Modules (Non-Safety)
In non-safety automotive subsystems such as seat controllers, mirror adjusters, or HVAC actuators, the W79E352AFG's 5 V tolerance, hardware PWM, and watchdog timer support brushed DC motor drive and LED driver control. AEC-Q100 is not qualified, so this part is recommended only for interior comfort modules where functional safety is not mandated, and the supply rail is well regulated.
推薦
推薦產品摘要
工程參考資料，適用於 W79E352AFG — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | W79E352ADG | W79E352RAFG | N79E352AFG | W78E052D |
|---|---|---|---|---|---|
| Brand | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation |
| Package | 44-QFP | 44-DIP | 44-QFP - same | 44-QFP - same | 44-QFP - same |
| Core | 8051 (1T/4T) | 8051 (1T/4T) | 8051 (1T/4T) | 8051 (1T/4T) | 8051 (4T) |
| Clock Frequency | 24 MHz | 24 MHz | 24 MHz | 24 MHz | 40 MHz |
| Flash Memory | 8 KB | 8 KB | 16 KB | 8 KB | 8 KB |
| RAM Size | 256 B | 256 B | 512 B | 256 B | 256 B |
| I/O Pins | 36 | 36 | 36 | 36 | 36 |
| Operating Voltage | 2.4 V to 5.5 V | 2.4 V to 5.5 V | 2.4 V to 5.5 V | 2.4 V to 5.5 V | 2.4 V to 5.5 V |
主要差異化特點
- Field-upgradeable ISP Flash (對比W78E052D)
- Doubled RAM in same package (對比W79E352RAFG)
- Industrial supply tolerance (對比W78E058D)
設計說明
Decouple VDD (pin 40) with a 0.1 uF ceramic capacitor placed within 5 mm of the package, paired with a bulk 10 uF electrolytic or tantalum capacitor on the same node. The 8051 core draws fast transient currents; insufficient decoupling causes spurious brown-out resets under PWM switching loads. Keep analog/digital grounds joined at a single star point under the IC.
Route the RST line (pin 9) away from PWM and high-current switching traces. Place the reset pull-up (typically 10 kohm) and 0.1 uF reset capacitor as close to pin 9 as possible. For ISP programming via UART, expose P3.0 (RXD, pin 10) and P3.1 (TXD, pin 11) on a header or test pad; many production designs also break these out to a 2.54 mm header for in-system firmware updates.
Estimated: assuming a 24 MHz crystal with 20 pF load caps, the XTAL pins typically need 10 to 33 pF NPO/C0G capacitors selected for the specific crystal's load specification. Do not use X7R or electrolytic capacitors on XTAL - their temperature drift pulls the oscillator off-frequency and can cause UART communication errors.
The QFP-44 package has a junction-to-ambient thermal resistance of approximately 80 C/W. At 24 MHz with all peripherals active, total supply current is typically 15 to 25 mA, dissipating well under 150 mW even at 5.5 V. Standard SMT land patterns with at least 1 oz copper pours are sufficient; no heatsink is required.
合規資訊
RoHS compliant per Nuvoton product page; AEC-Q100 not qualified - do not use in safety-critical automotive subsystems. REACH and conflict-mineral declarations should be confirmed with Nuvoton directly via their product compliance portal.
