W78E516DDG - 8-bit 8051 MCU, 64KB Flash, 40MHz | Nuvoton
MPN： W78E516DDG ✓ 啟用中W78E516DDG 概覽
An 8051 microcontroller is a member of the classic Intel MCS-51 family: an 8-bit CISC architecture with 8-bit ALU, Harvard memory separation, four bidirectional 8-bit ports, two 16-bit timers, and a full-duplex UART. The 8051 remains one of the most widely taught and deployed embedded controller architectures, spanning microcontrollers, embedded control ICs, and semiconductor components for industrial and consumer systems.
Key features include the 64KB x 8 program Flash, 512 x 8 bytes of RAM, a configurable 6T/12T machine-cycle engine that is fully instruction-compatible with the standard 8052, and an auxiliary 4KB Flash bank that holds an in-system programming (ISP) loader so firmware can be updated through the UART without removing the chip. Wide 2.4V-5.5V operation allows the same board to run from 3.3V or 5V logic.
Architecturally, the device implements the standard 8052 core with Timer 0, Timer 1, and Timer 2, an 8-source interrupt controller, and a full-duplex serial port. The dual-bank Flash architecture separates application code from the ISP firmware-update engine, improving field-update reliability.
Typical applications include industrial control panels, instrumentation front ends, legacy 8051 system maintenance, and consumer appliance controllers where 5V tolerance and DIP through-hole mounting simplify production and repair.
For design, remember EA must be strapped to VDD to execute from internal Flash, and P0 requires external pull-up resistors when used as a general-purpose port.
This page synthesizes distributor pricing, drop-in alternatives, pinout, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 W78E516DDG — 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。
此系列的變體
與下列產品可直接替換的同系列型號： W78E516DDG （相同外形與佔位） — 差異在於 Package, RAM Size, Mounting Type, Operating Temperature Range, Program Memory Size.
W78E516DG
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
W78E058DDG
✅ 直接替換聯絡詢價
查看資料表 →W78E058DG
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
W78E516DPG
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →W78E516DDG 最大額定值與電氣特性
| Core Architecture | 8-bit 80C51 CISC (8052-compatible) |
| Program Memory Size | 64KB (64K x 8) Flash EPROM |
| Auxiliary Flash | 4KB (ISP loader bank) |
| RAM Size | 512 x 8 bytes |
| 最大時脈頻率 | 40 MHz |
| Supply Voltage Range | 2.4 V to 5.5 V |
| Number of I/O | 36 |
| Timers | Timer 0, Timer 1, Timer 2 (16-bit) |
| Serial Interface | Full-duplex UART |
| In-System Programming | Yes (via 4KB auxiliary Flash) |
| Instruction Set Compatibility | Standard 8052 |
| 工作溫度 | -40C to +70C |
| 封裝 | DIP-40 |
| 安裝類型 | Through-Hole |
| RoHS Code | Yes (Pb-free) |
| Life Cycle Code | Active |
W78E516DDG 腳位配置
| 腳位 1 | P1.0 (T2) — Port 1 bit 0 / Timer 2 external input |
| 腳位 2 | P1.1 (T2EX) — Port 1 bit 1 / Timer 2 capture trigger |
| 腳位 3 | P1.2 — Port 1 bit 2 |
| 腳位 4 | P1.3 — Port 1 bit 3 |
| 腳位 5 | P1.4 — Port 1 bit 4 |
| 腳位 6 | P1.5 — Port 1 bit 5 |
| 腳位 7 | P1.6 — Port 1 bit 6 |
| 腳位 8 | P1.7 — Port 1 bit 7 |
| 腳位 9 | RST — Reset input (active high) |
| 腳位 10 | P3.0 (RXD) — Port 3 bit 0 / UART receive |
| 腳位 11 | P3.1 (TXD) — Port 3 bit 1 / UART transmit |
| 腳位 12 | P3.2 (INT0) — Port 3 bit 2 / External interrupt 0 |
| 腳位 13 | P3.3 (INT1) — Port 3 bit 3 / External interrupt 1 |
| 腳位 14 | P3.4 (T0) — Port 3 bit 4 / Timer 0 external input |
| 腳位 15 | P3.5 (T1) — Port 3 bit 5 / Timer 1 external input |
| 腳位 16 | P3.6 (WR) — Port 3 bit 6 / External memory write strobe |
| 腳位 17 | P3.7 (RD) — Port 3 bit 7 / External memory read strobe |
| 腳位 18 | XTAL2 — Crystal oscillator output |
| 腳位 19 | XTAL1 — Crystal oscillator input |
| 腳位 20 | GND — Ground |
| 腳位 21 | P2.0 (A8) — Port 2 bit 0 / External address A8 |
| 腳位 22 | P2.1 (A9) — Port 2 bit 1 / External address A9 |
| 腳位 23 | P2.2 (A10) — Port 2 bit 2 / External address A10 |
| 腳位 24 | P2.3 (A11) — Port 2 bit 3 / External address A11 |
| 腳位 25 | P2.4 (A12) — Port 2 bit 4 / External address A12 |
| 腳位 26 | P2.5 (A13) — Port 2 bit 5 / External address A13 |
| 腳位 27 | P2.6 (A14) — Port 2 bit 6 / External address A14 |
| 腳位 28 | P2.7 (A15) — Port 2 bit 7 / External address A15 |
| 腳位 29 | PSEN — Program store enable for external code memory |
| 腳位 30 | ALE — Address latch enable |
| 腳位 31 | EA — External access enable; strap to VDD for internal Flash execution |
| 腳位 32 | P0.7 (AD7) — Port 0 bit 7 / address-data bus (needs external pull-up) |
| 腳位 33 | P0.6 (AD6) — Port 0 bit 6 / address-data bus (needs external pull-up) |
| 腳位 34 | P0.5 (AD5) — Port 0 bit 5 / address-data bus (needs external pull-up) |
| 腳位 35 | P0.4 (AD4) — Port 0 bit 4 / address-data bus (needs external pull-up) |
| 腳位 36 | P0.3 (AD3) — Port 0 bit 3 / address-data bus (needs external pull-up) |
| 腳位 37 | P0.2 (AD2) — Port 0 bit 2 / address-data bus (needs external pull-up) |
| 腳位 38 | P0.1 (AD1) — Port 0 bit 1 / address-data bus (needs external pull-up) |
| 腳位 39 | P0.0 (AD0) — Port 0 bit 0 / address-data bus (needs external pull-up) |
| 腳位 40 | VCC — Power supply (2.4V to 5.5V) |
典型應用
W78E516DDG 適用於 6 應用s: Industrial Control Panels, Legacy 8051 System Maintenance and Repair, Instrumentation and Measurement Front Ends, Consumer Appliance Controllers, Embedded Communication Nodes, Educational and Prototyping Platforms.
Industrial Control Panels
The W78E516DDG fits industrial control panels because its -40C to +70C operating range, 2.4V-5.5V supply tolerance, and 36 I/O lines cover typical relay, button, and indicator interfacing without expansion logic. The three 16-bit timers generate PWM or measure pulse trains from encoders, while the full-duplex UART connects to RS-485 transceivers for MODUS-RTU-style networks. Its 64KB Flash accommodates large ladder-interpreter or protocol firmware that exceeds the 8KB of smaller 8051 parts, and the 4KB auxiliary bank enables field firmware updates over the same RS-485-linked UART, avoiding chip removal in sealed cabinets. Through-hole DIP-40 mounting withstands vibration better than fine-pitch SMD and allows socketed replacement by maintenance technicians. The trade-off versus a modern 32-bit MCU is lower computational throughput at the 40MHz clock ceiling, so it is best for deterministic, I/O-centric control rather than heavy math.
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Legacy 8051 System Maintenance and Repair
For sustaining classic 8051-based equipment, the W78E516DDG is an ideal service part because it is pin-compatible with traditional 12T 8051 DIP-40 devices and fully 8052 instruction-compatible, allowing drop-in replacement of failed or obsolete original CPUs. The 64KB on-chip Flash can emulate external EPROM program storage when EA is strapped high, eliminating EPROM sockets and programming equipment; code previously burned into 27C256/27C512 EPROMs programs directly into internal Flash via the 4KB ISP loader over a simple UART connection. Wide 2.4V-5.5V operation means the same replacement part works in 5V-only legacy boards and in later 3.3V revisions. Pb-free DDG construction also satisfies RoHS requirements for repaired units entering EU markets. Repair shops benefit from socketed DIP-40 installation, which requires no hot-air rework and keeps mean-time-to-repair in the field to minutes rather than hours.
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Instrumentation and Measurement Front Ends
Bench and panel instrumentation benefit from the W78E516DDG's deterministic 8052 core and rich timer set. Timer 2 in capture mode timestamps external events, while Timer 0/1 generate conversion clocks for external ADCs; the UART streams results to a PC or display controller. Its 64KB Flash holds lookup tables, calibration constants in-code, and multi-protocol communication stacks simultaneously - capacity unavailable in 8KB-class parts. The 2.4V-5.5V range allows direct interfacing with both 5V and 3.3V analog signal-conditioning front ends, and the Pb-free DIP-40 package suits hand-assembled, low-volume instruments where reflow ovens are unavailable. The ISP capability lets one firmware image serve multiple instrument variants, reconfigured in-system at final test through the UART. Designers should budget external pull-ups on Port 0 when using it as a general-purpose bus, and account for the 6T/12T machine-cycle setting when computing timer periods against ADC sample clocks.
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Consumer Appliance Controllers
The W78E516DDG serves appliance control boards - washing machines, air conditioners, rice cookers - where cost, 5V-tolerant I/O, and simple through-hole assembly matter more than processing power. The 36 I/O lines directly drive seven-segment displays, triacs via optocouplers, and read membrane-key matrices without port expanders. The 64KB Flash accommodates extensive state-machine code plus localized UI strings, and the 4KB ISP bank supports manufacturing-line firmware configuration over the production fixture's UART, allowing one PCB to serve multiple model variants. Its 40MHz maximum clock handles the fastest button-scan and display-multiplex timing with headroom, while the wide 2.4V-5.5V supply tolerates unregulated transformer-derived rails after local regulation sag. Because the part is Pb-free and RoHS-compliant, finished appliances meet EU environmental directives. The DIP-40 footprint also simplifies in-circuit test fixtures and rework at contract manufacturers running mixed through-hole/SMD appliance boards.
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Embedded Communication Nodes
As a communication node controller, the W78E516DDG pairs its full-duplex UART with external transceivers to implement RS-232, RS-485, or simple protocol bridges. The 40MHz clock supports UART rates well into the hundreds of kilobaud with low timing error when the 6T setting is chosen, and Timer 1 baud-rate generation follows the classic 8051 formulas familiar to embedded developers. The 512 bytes of RAM provide double buffering for packet handling in small-frame industrial protocols, while the 64KB Flash stores multiple protocol stacks selectable at boot. In-system programming over the communication line itself enables remote field upgrades of deployed nodes - a significant maintenance advantage in distributed installations such as lighting networks, metering hubs, and access-control panels. The 2.4V-5.5V operation allows direct connection to 5V transceiver logic without level shifting. Designers should add TVS protection on the transceiver line per industrial surge practice.
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Educational and Prototyping Platforms
Universities and hobbyists continue to teach embedded fundamentals on the 8051, and the W78E516DDG is an excellent educational vehicle: the DIP-40 through-hole package plugs into breadboards and solderless prototyping boards, every pin is large and probeable with standard equipment, and the fully documented 8052 instruction set maps directly to classic textbooks. The 64KB Flash removes the constant code-size ceiling students hit on 8KB parts, so complete multi-module projects fit on-chip, and the 4KB ISP loader eliminates the need for a dedicated programmer - code is flashed over the UART from a free terminal program. Wide 2.4V-5.5V operation makes the chip forgiving of wiring mistakes on student power supplies. Because the architecture matches the industry-standard MCS-51 register map, skills transfer directly to commercial 8051 derivatives. The 6T/12T configuration option also lets instructors demonstrate machine-cycle timing concepts empirically with an oscilloscope on ALE and PSEN.
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推薦產品摘要
工程參考資料，適用於 W78E516DDG — 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 | W78E516DG | W78E058DDG | W78E058DG |
|---|---|---|---|---|
| Package | DIP-40 | DIP-40 - same | DIP-40 - same | DIP-40 - same |
| Brand | Nuvoton | Nuvoton | Nuvoton | Nuvoton |
| Program Flash | 64 KB | 64 KB | 32 KB | 32 KB |
| Auxiliary Flash | 4 KB | 4 KB | 4 KB | 4 KB |
| RAM | 512 bytes | 512 bytes | 512 bytes | 512 bytes |
| Max Clock | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Supply 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 |
| Pb-Free / RoHS | Yes (DDG suffix) | No (tin-lead) | Yes (DDG suffix) | No (tin-lead) |
主要差異化特點
- Full 64KB program Flash capacity (對比W78E058DDG)
- RoHS Pb-free construction (對比W78E516DG)
- In-system programmable dual-bank Flash (對比Classic 8052 with external EPROM)
設計說明
EA must be strapped to VDD for the W78E516DDG to execute from its internal 64KB Flash; leaving EA floating or low makes the core fetch code from external memory and the board appears dead. Additionally, Port 0 is open-drain when used as a general-purpose I/O - each P0 line requires an external 4.7k to 10k pull-up resistor, whereas P1, P2, and P3 have internal pull-ups. These two wiring details are the most common causes of first-power-up failures on new 8051 DIP-40 boards.
Decouple VCC (pin 40) to GND (pin 20) with a 0.1uF ceramic capacitor placed within 10mm of the pins, plus a 10uF bulk capacitor per board. The core draws its maximum supply current at 40MHz and 5.5V; consult the datasheet ICC table for your exact clock and voltage point. When running from an unregulated wall adapter, regulate to 5V with headroom - the 2.4V minimum rating does not imply tolerance of noisy rails, and brownouts below 2.4V can corrupt Flash writes during ISP operation.
Connect the crystal between XTAL1 (pin 19) and XTAL2 (pin 18) with two load capacitors (typically 30pF for a standard parallel crystal; verify with the crystal manufacturer's load specification). Keep the crystal traces as short as possible and surround them with ground to prevent the full-swing oscillator from radiating into nearby analog circuitry. A common trick: use an 11.0592MHz crystal so Timer 1 baud-rate division yields exact standard UART rates with zero error - important for reliable ISP transfers over long RS-485 lines.
For socketed through-hole assembly, use a machined-pin or dual-wipe DIP-40 socket rather than soldering the MCU directly - this preserves field serviceability and protects the Flash part from rework heat. Keep RST (pin 9) driven by a power-on-reset supervisor or an RC network (10uF/10k) so the core never starts executing from an undefined state during slow supply ramp-up; erratic startup is a classic 8051 issue on boards lacking proper reset supervision.
合規資訊
RoHS Code: Yes and REACH compliance noted in Worldway part data; Mouser lists the part as Pb-free. Halogen-free and conflict-minerals status not stated in provided data.
