ATMEGA128-16MU - 8-Bit AVR MCU 16MHz 128KB Flash | Microchip
MPN： ATMEGA128-16MU ✓ 啟用中ATMEGA128-16MU 概覽
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, placing it in the broader hierarchy of microcontrollers (MCU) -> embedded processors -> integrated circuits. MCUs integrate CPU, memory, and peripherals on one die, making them the workhorse of embedded control systems.
Key features of the ATMEGA128-16MU include 128 KB (64K x 16) Flash with Read-While-Write capability, 4 KB EEPROM, 4 KB SRAM, and an 8-channel 10-bit ADC. Its single-cycle RISC core delivers up to 16 MIPS at 16 MHz, providing deterministic execution for real-time control.
The technical architecture includes four flexible Timer/Counters with compare modes and PWM, two USARTs, a byte-oriented Two-Wire Interface (I2C-compatible TWI), a SPI serial interface, a Real Time Counter with separate oscillator, and a JTAG (IEEE 1149.1-compliant) interface for on-chip debug and boundary scan. The device is 100% pin compatible with the ATmega103 and can replace it on existing PCBs.
Typical applications include industrial control systems, consumer electronics, building automation, and instrumentation where the 128 KB Flash accommodates larger firmware images than smaller ATmega parts.
Design consideration: select the M-version (MLF/QFN) when board height and thermal pad grounding matter, and remember the 10-bit ADC requires a clean AVCC supply and stable AREF reference for full accuracy.
This page synthesizes distributor data, drop-in alternatives, and practical design notes not found in a single manufacturer datasheet.
直接替換替代品，適用於 ATMEGA128-16MU — 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： ATMEGA128-16MU （相同外形與佔位） — 差異在於 Package, Throughput, Flash Memory, Timers, Communication Interfaces.
ATMEGA128A-MU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →AT90CAN128-16MU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA1281-16MUR
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA2561-16MU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA64A-MU
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA128-16MU 最大額定值與電氣特性
| Core Architecture | 8-bit AVR RISC |
| CPU Speed | 16 MHz |
| Flash Memory | 128 KB (64K x 16) In-System Programmable |
| EEPROM | 4 KB |
| SRAM | 4 KB |
| GPIO Count | 53 I/O lines |
| ADC | 8-channel 10-bit |
| Timers/Counters | 4 with compare modes and PWM |
| USART | 2 |
| TWI (I2C) | Yes, byte-oriented Two-Wire Interface |
| SPI | Yes |
| JTAG | Yes, on-chip debugging and boundary scan |
| 封裝 | 64-QFN (9x9 mm, MLF) |
| 安裝類型 | Surface Mount |
| Compatibility | 100% pin compatible with ATmega103 |
ATMEGA128-16MU 64-qfn (9x9 mm, mlf) 腳位配置指南
ATMEGA128-16MU（64-qfn (9x9 mm, mlf) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： ATMEGA128-16MU.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATMEGA128-16MU 適用於 6 應用s: Industrial Control Systems, Building Automation Nodes, Consumer Electronics Control, Instrumentation and Data Loggers, Motor Control Applications, Embedded Networking Gateways.
Industrial Control Systems
The ATMEGA128-16MU fits industrial control nodes where 128 KB Flash accommodates communication stacks and HMI logic, and 53 I/O lines drive relays, sensors, and indicators directly. Its deterministic single-cycle RISC core at 16 MHz (up to 16 MIPS) provides real-time response for sequencing and interlocks, while the two USARTs support Modbus RTU links and the TWI interface reads I2C sensors. Placed as the main controller with a 16 MHz crystal, watchdog enabled, and industrial-grade temperature rating verified, it runs 24/7 control loops; unlike smaller ATmega64 parts, its 128 KB program space leaves headroom for OTA firmware growth in the field.
推薦
Building Automation Nodes
Building automation controllers benefit from the ATMEGA128-16MU's combination of TWI, SPI, and two USARTs, enabling daisy-chained sensor networks, RS-485 fieldbus bridges, and local actuator control from a single MCU. The 4 KB EEPROM stores calibration constants, node addresses, and schedules that survive power loss, while the 8-channel 10-bit ADC digitizes temperature, humidity, and current sensors at 0.1% class resolution adequate for HVAC monitoring. The 64-QFN (9x9 mm) compact footprint suits dense distributed I/O modules, and the JTAG interface supports field development without removing the device from the board.
推薦
Consumer Electronics Control
In consumer products such as small appliances, remote controllers, and gaming peripherals, the ATMEGA128-16MU provides a cost-effective 8-bit control core where 16 MHz performance handles menu-driven UIs, PWM dimming, and infrared protocol decoding without an RTOS. Four Timer/Counters with PWM outputs generate motor speed control and LED brightness control channels, while the 128 KB Flash supports multilingual menus and graphical LCD drivers that smaller ATmega parts cannot fit. The MLF package's low profile suits slim enclosures, and its exposed die pad bonded to ground improves EMI behavior in cost-sensitive plastic-housed products.
推薦
Instrumentation and Data Loggers
Portable instrumentation and data loggers use the ATMEGA128-16MU's 8-channel 10-bit ADC to sample multi-sensor inputs, its 4 KB EEPROM plus external SPI Flash to store records, and its USARTs to upload data over RS-232 or radio modules. The Real Time Counter with a separate 32.768 kHz oscillator maintains timestamps during sleep, and AVR power-down modes extend battery life in duty-cycled designs. The 16 MHz core executes digital filtering and linearization math quickly enough for 1 kSPS-class logging, and JTAG on-chip debugging shortens development cycles when calibrating measurement front-ends.
推薦
Motor Control Applications
The ATMEGA128-16MU suits small DC and stepper motor controllers: its four Timer/Counters with compare modes and PWM outputs generate complementary drive signals, while the ADC reads current-shunt feedback and the analog comparator supports cycle-by-cycle current limiting. At 16 MHz, PWM resolution reaches 8-10 bits at audible-suppression frequencies suitable for fan, pump, and actuator drives. The 53 I/O lines handle limit switches, encoders, and H-bridge gate control without external logic, and the watchdog timer ensures safe shutdown on firmware faults - critical in motorized consumer and light-industrial equipment.
推薦
Embedded Networking Gateways
Serial-to-Ethernet bridges and small protocol gateways leverage the ATMEGA128-16MU's two independent USARTs to translate between RS-232/RS-485 field devices and an external network co-processor over SPI. The 128 KB Flash holds dual protocol stacks plus a bootloader, and Read-While-Write Flash enables firmware updates while the application monitors communications - important for remotely deployed units. Its JTAG boundary scan supports production test of dense multi-chip boards, and the 64-QFN (9x9 mm) package keeps gateway PCBs compact. Deterministic interrupt latency ensures wire-speed serial bridging without dropped characters at 115.2 kbaud.
推薦
推薦產品摘要
工程參考資料，適用於 ATMEGA128-16MU — 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 | ATMEGA128A-MU | AT90CAN128-16MU | ATMEGA1281-16MUR | ATMEGA64A-MU |
|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm, MLF) | 64-QFN (9x9 mm, MLF) - same | 64-QFN (9x9 mm, MLF) - same | 64-QFN (9x9 mm, MLF) - same | 64-QFN (9x9 mm, MLF) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB | 64 KB |
| CPU Speed | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| CAN Controller | No | No | Yes, CAN 2.0A/B | No | No |
| SRAM | 4 KB | 4 KB | 4 KB | 8 KB | 4 KB |
| Firmware Compatibility with ATmega128 | Native | Direct, code-compatible successor | Partial - peripheral registers differ | Partial - register map differs | Partial - must fit in 64 KB |
主要差異化特點
- Largest AVR program memory in the classic 64-MLF footprint at launch (對比ATMEGA64A-MU)
- 100% ATmega103 pin compatibility for legacy board reuse (對比ATMEGA1281-16MUR)
- Deterministic single-cycle RISC core vs needing a CAN coprocessor (對比AT90CAN128-16MU)
- Honest trade-off: higher power than successor die (對比ATMEGA128A-MU)
設計說明
The 64-QFN (9x9 mm MLF) package has a large exposed die pad under the device. Solder this pad to a grounded copper pour via an array of thermal vias (typically 5x5 pattern of 0.3 mm vias) - it is the main ground return and heat conduction path. Since [DATA_NEEDED] applies to exact theta_JA, verify the thermal figures in the Microchip package drawing before high-temperature designs. Note that X-ray inspection is recommended to confirm void-free pad soldering on production boards.
Decouple every VCC pin pair with 100 nF ceramic capacitors placed within 3 mm of the pins, plus 10 uF bulk capacitance near the device. AVCC powers the ADC - feed it through an RC or LC filter (e.g., 10 ohm resistor plus 100 nF/10 uF) from the digital rail, and connect AREF to a clean reference with a 100 nF bypass for full 10-bit accuracy. Keep the JTAG-enabled fuse in mind: PF4-PF7 default to JTAG after reset, so ADC channels 4-7 are unavailable unless JTAG is fused off.
Three frequent ATmega128 pitfalls: (1) The PC7 pin doubles as TOSC2 for the RTC - using an external 32.768 kHz RTC crystal on PC6/PC7 removes two address lines from external-memory mode. (2) External memory interface pins (PA/PC ports) default to general I/O only when the XMEM fuse is set correctly; verify MCUCR/SFIOR settings. (3) Migrating code from ATmega103 requires reviewing the Microchip application note 'Replacing ATmega103 by ATmega128' because register addresses and boot features differ despite 100% pin compatibility.
合規資訊
Compliance certificates not present in the verified web data. Microchip supplies RoHS/REACH declarations for ATmega128 family parts on request via its product page - confirm against the certificate of conformity for your date code.
