ATMEGA128L-8MU - 8MHz AVR MCU 128KB Flash QFN-64 | Microchip
MPN: ATMEGA128L-8MU ✓ نشطATMEGA128L-8MU نظرة عامة
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor in which most of its 133 powerful instructions execute in a single clock cycle, placing it in the broader hierarchy of microcontroller units (MCUs) within the embedded processor and semiconductor family. MCUs integrate CPU, program memory, data memory, and peripherals on a single die, making them the control backbone of embedded systems.
Key features of the ATMEGA128L-8MU include 128KB (64K x 16) programmable Flash memory, 4KB SRAM, 4KB EEPROM, an 8-channel 10-bit A/D converter, and an IEEE-compatible JTAG interface for on-chip debugging and boundary-scan. It also provides two 8-bit and two 16-bit timers/counters, two USARTs, SPI, TWI (I2C-compatible), and six PWM channels, enabling compact single-chip designs.
Technically, the advanced AVR RISC architecture with a 32-register general-purpose file is directly connected to the ALU, allowing one instruction executed per clock cycle for throughput up to 8 MIPS at 8 MHz. The JTAG boundary-scan capability simplifies production test, while In-System Programmability allows firmware updates on the final PCB without removal.
Typical applications include industrial control and automation nodes, building and HVAC controllers, sensor data acquisition systems, and legacy embedded designs originally built around the pin-compatible ATmega103. The low-voltage 2.7V operation suits battery-powered instruments.
A key design consideration: when replacing an ATmega103, configure the M103C fuse so the ATmega128 boots with ATmega103-compatible behavior; consult Microchip application note on ATmega103 migration.
This page synthesizes distributor pricing, verified drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet.
بدائل مباشرة لـ ATMEGA128L-8MU — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع ATMEGA128L-8MU (نفس عامل الشكل والبصمة) — يختلف في Package, Flash Memory, RoHS Status, Timers/Counters, SRAM.
ATMEGA1281V-8MU
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←ATMEGA1281V-8MUR
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←ATMEGA1281-16MUR
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←ATMEGA128L-8MU الحدود القصوى والخصائص الكهربائية
| Core Architecture | 8-bit AVR RISC |
| Max Clock Speed | 8 MHz |
| Program Memory (Flash) | 128KB (64K x 16) |
| SRAM | 4KB |
| EEPROM | 4KB |
| جهد التغذية | 2.7 V to 5.5 V |
| I/O Pins | 53 |
| ADC | 8-channel, 10-bit |
| Debug Interface | JTAG (on-chip debugging, boundary scan) |
| Instructions | 133 (most single-cycle) |
| العلبة | 64-QFN / MLF (9 x 9 mm) |
| نوع التركيب | Surface Mount |
| درجة حرارة التشغيل | Industrial (-40C to +85C) |
| Series | AVR ATmega |
| حالة RoHS | Compliant (GREEN per FindIC listing) |
| Lifecycle Stage | Active |
تكوين أطراف ATMEGA128L-8MU
| دبوس 1 | PEN — Programming Enable (serial program and debug) |
| دبوس 2 | PE0 (RXD0/PDI) — USART0 receive / programming data in |
| دبوس 3 | PE1 (TXD0/PDO) — USART0 transmit / programming data out |
| دبوس 4 | PE2 (XCK0/AIN0) — USART0 clock / analog comparator input 0 |
| دبوس 5 | PE3 (OC3A/AIN1) — Timer3 output compare A / comparator input 1 |
| دبوس 6 | PE4 (OC3B/INT4) — Timer3 output compare B / external interrupt 4 |
| دبوس 7 | PE5 (OC3C/INT5) — Timer3 output compare C / external interrupt 5 |
| دبوس 8 | PE6 (T3/INT6) — Timer3 clock input / external interrupt 6 |
| دبوس 9 | PE7 (ICP3/INT7) — Timer3 input capture / external interrupt 7 |
| دبوس 10 | PB0 (SS) — SPI slave select / general I/O |
| دبوس 11 | PB1 (SCK) — SPI clock / general I/O |
| دبوس 12 | PB2 (MOSI) — SPI master data out / general I/O |
| دبوس 13 | PB3 (MISO) — SPI master data in / general I/O |
| دبوس 14 | PB4 (OC0) — Timer0 output compare / PWM |
| دبوس 15 | PB5 (OC1A) — Timer1 output compare A / PWM |
| دبوس 16 | PB6 (OC1B) — Timer1 output compare B / PWM |
| دبوس 17 | PB7 (OC2/OC1C) — Timer2 output compare / Timer1 output compare C |
| دبوس 18 | PG3 (TOSC2) — Timer oscillator output (32 kHz RTC crystal) |
| دبوس 19 | PG4 (TOSC1) — Timer oscillator input (32 kHz RTC crystal) |
| دبوس 20 | RESET — Reset input (active low) |
| دبوس 21 | VCC — Digital supply voltage |
| دبوس 22 | GND — Digital ground |
| دبوس 23 | XTAL2 — System crystal oscillator output |
| دبوس 24 | XTAL1 — System crystal oscillator input |
| دبوس 25 | PD0 (SCL/INT0) — TWI clock / external interrupt 0 |
| دبوس 26 | PD1 (SDA/INT1) — TWI data / external interrupt 1 |
| دبوس 27 | PD2 (RXD1/INT2) — USART1 receive / external interrupt 2 |
| دبوس 28 | PD3 (TXD1/INT3) — USART1 transmit / external interrupt 3 |
| دبوس 29 | PD4 (ICP1) — Timer1 input capture |
| دبوس 30 | PD5 (XCK1) — USART1 external clock |
| دبوس 31 | PD6 (T1) — Timer1 external counter input |
| دبوس 32 | PD7 (T2) — Timer2 external counter input |
| دبوس 33 | PG0 (WR) — External memory write strobe |
| دبوس 34 | PG1 (RD) — External memory read strobe |
| دبوس 35 | PC0 (A8) — External memory address line 8 / general I/O |
| دبوس 36 | PC1 (A9) — External memory address line 9 / general I/O |
| دبوس 37 | PC2 (A10) — External memory address line 10 / general I/O |
| دبوس 38 | PC3 (A11) — External memory address line 11 / general I/O |
| دبوس 39 | PC4 (A12) — External memory address line 12 / general I/O |
| دبوس 40 | PC5 (A13) — External memory address line 13 / general I/O |
| دبوس 41 | PC6 (A14) — External memory address line 14 / general I/O |
| دبوس 42 | PC7 (A15) — External memory address line 15 / general I/O |
| دبوس 43 | PG2 (ALE) — External memory address latch enable |
| دبوس 44 | PA7 (AD7) — External memory address/data line 7 / general I/O |
| دبوس 45 | PA6 (AD6) — External memory address/data line 6 / general I/O |
| دبوس 46 | PA5 (AD5) — External memory address/data line 5 / general I/O |
| دبوس 47 | PA4 (AD4) — External memory address/data line 4 / general I/O |
| دبوس 48 | PA3 (AD3) — External memory address/data line 3 / general I/O |
| دبوس 49 | PA2 (AD2) — External memory address/data line 2 / general I/O |
| دبوس 50 | PA1 (AD1) — External memory address/data line 1 / general I/O |
| دبوس 51 | PA0 (AD0) — External memory address/data line 0 / general I/O |
| دبوس 52 | VCC — Digital supply voltage |
| دبوس 53 | GND — Digital ground |
| دبوس 54 | PF0 (ADC0) — ADC input 0 / general I/O |
| دبوس 55 | PF1 (ADC1) — ADC input 1 / general I/O |
| دبوس 56 | PF2 (ADC2) — ADC input 2 / general I/O |
| دبوس 57 | PF3 (ADC3) — ADC input 3 / general I/O |
| دبوس 58 | PF4 (ADC4/TCK) — ADC input 4 / JTAG test clock |
| دبوس 59 | PF5 (ADC5/TMS) — ADC input 5 / JTAG test mode select |
| دبوس 60 | PF6 (ADC6/TDO) — ADC input 6 / JTAG test data out |
| دبوس 61 | PF7 (ADC7/TDI) — ADC input 7 / JTAG test data in |
| دبوس 62 | AREF — ADC analog reference voltage |
| دبوس 63 | AGND — Analog ground |
| دبوس 64 | AVCC — ADC supply voltage |
التطبيقات النموذجية
ATMEGA128L-8MU مناسب لـ 6 التطبيقs: Industrial Control and Automation, Battery-Powered Instrumentation, Building Automation and HVAC Controllers, Legacy ATmega103 System Migration, Sensor Data Acquisition Systems, Embedded Robotics and Motor Control.
Industrial Control and Automation
The ATMEGA128L-8MU fits industrial control nodes because it combines 53 I/O lines, dual USARTs for Modbus RTU linking, SPI/TWI for field sensors, and a 10-bit ADC with 8 multiplexed channels for analog process signals. Operating from a 2.7V to 5.5V supply lets it run directly from a 5V industrial rail, and the industrial temperature grade of -40C to +85C withstands cabinet environments. The JTAG boundary-scan interface accelerates production test of assembled control boards. Placed as the main controller, its 8 MHz core delivers roughly 8 MIPS, sufficient for relay sequencing, PID loops at moderate rates, and protocol handling, while the 4KB EEPROM stores calibration and configuration data that must survive power cycles.
موصى به
Battery-Powered Instrumentation
With its 'L' low-voltage grade rated 2.7V to 5.5V, the ATMEGA128L-8MU runs directly from a 3.0V lithium cell without a boost regulator, and AVR sleep modes (idle, power-down, power-save) cut current to microamp levels between measurements. The 8-channel 10-bit ADC digitizes sensor inputs, and the 4KB EEPROM retains zero/span calibration without battery backup. The 64-QFN 9x9 mm package suits compact handheld enclosures, and 53 I/O lines drive displays, keypads, and actuators. A typical design wakes the MCU on an external interrupt, samples the ADC array, logs to EEPROM or external flash over SPI, and returns to power-down, maximizing battery life in data loggers and portable meters.
موصى به
Building Automation and HVAC Controllers
The ATMEGA128L-8MU is a proven fit for building automation panels: dual USARTs handle BACnet/Modbus links, TWI (I2C) reads temperature and humidity sensors, and six PWM channels drive damper motors and heater triacs. The 8 MHz AVR core comfortably runs a multi-loop PID scheduler with 8 MIPS single-cycle throughput, while 128KB Flash accommodates protocol stacks and web- bootloader firmware for field updates over the network. The industrial temperature rating supports rooftop and mechanical-room installations, and the JTAG interface enables boundary-scan test of assembled controller boards. The 4KB EEPROM stores setpoints and schedules that persist through power interruptions without external memory.
موصى به
Legacy ATmega103 System Migration
Microchip positions the ATmega128 as the direct migration device for the discontinued ATmega103: it is 100% pin compatible and can replace the ATmega103 on existing PCBs. Engineers program the M103C compatibility fuse so the ATMEGA128L-8MU boots with ATmega103 behavior, then follow the Microchip application note 'Replacing ATmega103 by ATmega128' for register and SRAM-mapping caveats. The low-voltage L grade matches the 3.3V supplies common on ATmega103 boards, and the 64-QFN/MLF package mirrors the original footprint. This path extends product lifetimes with zero PCB redesign while gaining 128KB Flash and JTAG debug that the ATmega103 lacked.
موصى به
Sensor Data Acquisition Systems
For distributed data acquisition, the ATMEGA128L-8MU offers an 8-channel 10-bit ADC with internal reference and oversampling capability, letting one MCU digitize eight analog sensors at up to roughly 15 kSPS effective rate. SPI connects high-speed external ADCs or precision converters when 10-bit resolution is insufficient, while TWI supports low-rate digital sensors on a shared bus. Dual USARTs stream measurements to both a local HMI and a remote radio or gateway simultaneously. Its 2.7V to 5.5V supply and industrial temperature range suit unattended field installations, and power-down sleep between sampling windows keeps average drain compatible with battery or energy-harvesting power budgets in remote monitoring networks.
موصى به
Embedded Robotics and Motor Control
Robotics controllers benefit from the ATMEGA128L-8MU's six PWM channels, four timers, and rich I/O: PWM outputs drive H-bridge gates for DC motor speed control, quadrature encoders feed external-interrupt and timer-capture inputs, and SPI manages an IMU at kilohertz rates. The 8 MHz single-cycle AVR core executes a 1 kHz control loop with headroom for PID per axis, while 128KB Flash holds trajectory tables and communication stacks (Bluetooth or serial telemetry on either USART). Operating from a 5V rail shared with servos simplifies power design, and 53 GPIO lines interface sonar arrays, limit switches, and status LEDs on a single controller board.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ ATMEGA128L-8MU — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | ATMEGA1281V-8MU | ATMEGA1281V-8MUR | ATMEGA1281-16MUR |
|---|---|---|---|---|
| Package | 64-QFN / MLF (9x9 mm) | 64-QFN / MLF (9x9 mm) - same | 64-QFN / MLF (9x9 mm) - same | 64-QFN / MLF (9x9 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Speed | 8 MHz | 8 MHz | 8 MHz | 16 MHz |
| Flash Memory | 128KB | 128KB | 128KB | 128KB |
| SRAM | 4KB | 8KB | 8KB | 8KB |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V |
| I/O Pins | 53 | 54 | 54 | 54 |
| Special Features | JTAG, 2 USART, SPI, TWI | JTAG, AES crypto module, PSC | JTAG, AES crypto module, PSC | JTAG, AES crypto module, PSC |
أبرز الفروقات
- ATmega103 legacy compatibility with true pin compatibility (مقابلATMEGA1281V-8MU)
- Wider low-voltage range than the 16 MHz sibling (مقابلATMEGA1281-16MUR)
- Lower SRAM than the migration family (مقابلATMEGA1281V-8MU)
ملاحظات التصميم
The 64-QFN/MLF package has a large exposed die pad on the underside that must be soldered to a grounded copper pour on the PCB for both thermal dissipation and mechanical reliability. The MLF (Micro Lead Frame) package is not a leaded QFN: perimeter pads are under the body edge, so specify a 0.5 mm-pitch land pattern with via fencing to ground. Inspect with X-ray or use sufficient stencil aperture design, since perimeter joints are not optically visible after reflow.
Decouple AVCC separately from VCC with an RC low-pass filter (e.g., 10 uH inductor or 100 ohm resistor plus 100 nF capacitor) to keep ADC noise low; connect AREF through a 100 nF capacitor to AGND and never drive it while the internal reference is selected. Place 100 nF ceramic capacitors at both VCC pins (21 and 52) as close to the pins as possible. At 8 MHz the current draw is modest, but brown-out detection should be enabled via fuse for 3.3V battery systems.
Two frequent traps: first, when migrating from ATmega103, the M103C fuse must be cleared to enable the full ATmega128 feature set (extended I/O map and added SRAM); second, the JTAG interface shares port F ADC pins 4-7, and JTAG stays enabled by default - either disable via the JTD bit or JTAGEN fuse, or ADC channels 4-7 will not work. Also remember that the 'MU' (MLF) and 'AU' (TQFP) suffixes have different land patterns and are not footprint interchangeable.
معلومات الامتثال
FindIC lists the ATMEGA128L-8MU as GREEN (Microchip RoHS-compliant, halogen-free packaging). REACH and conflict-minerals declarations not present in provided data.
