ATMEGA128L-8MU - 8MHz AVR MCU 128KB Flash QFN-64 | Microchip
MPN: ATMEGA128L-8MU ✓ AktifATMEGA128L-8MU Ringkasan
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.
Alternatif penggantian untuk ATMEGA128L-8MU — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian ATMEGA128L-8MU (sama faktor bentuk dan footprint) — berbeda di dalam Package, Flash Memory, RoHS Status, Timers/Counters, SRAM.
ATMEGA1281V-8MU
✅ Drop-In ⚠️ Spesifikasi Tidak DisahkanKontak untuk harga
Lihat Datasheet →ATMEGA1281V-8MUR
✅ Drop-In ⚠️ Spesifikasi Tidak DisahkanKontak untuk harga
Lihat Datasheet →ATMEGA1281-16MUR
✅ Drop-In ⚠️ Spesifikasi Tidak DisahkanKontak untuk harga
Lihat Datasheet →ATMEGA128L-8MU Rating Maksimal & Karakteristik Listrik
| Core Architecture | 8-bit AVR RISC |
| Max Clock Speed | 8 MHz |
| Program Memory (Flash) | 128KB (64K x 16) |
| SRAM | 4KB |
| EEPROM | 4KB |
| Tegangan Pemuat | 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) |
| Paket | 64-QFN / MLF (9 x 9 mm) |
| Tipe Mounting | Surface Mount |
| Suhu Kerja | Industrial (-40C to +85C) |
| Series | AVR ATmega |
| Status RoHS | Compliant (GREEN per FindIC listing) |
| Lifecycle Stage | Active |
Konfigurasi Pin ATMEGA128L-8MU
| Pin produk 1 | PEN — Programming Enable (serial program and debug) |
| Pin produk 2 | PE0 (RXD0/PDI) — USART0 receive / programming data in |
| Pin produk 3 | PE1 (TXD0/PDO) — USART0 transmit / programming data out |
| Pin produk 4 | PE2 (XCK0/AIN0) — USART0 clock / analog comparator input 0 |
| Pin produk 5 | PE3 (OC3A/AIN1) — Timer3 output compare A / comparator input 1 |
| Pin produk 6 | PE4 (OC3B/INT4) — Timer3 output compare B / external interrupt 4 |
| Pin produk 7 | PE5 (OC3C/INT5) — Timer3 output compare C / external interrupt 5 |
| Pin produk 8 | PE6 (T3/INT6) — Timer3 clock input / external interrupt 6 |
| Pin produk 9 | PE7 (ICP3/INT7) — Timer3 input capture / external interrupt 7 |
| Pin produk 10 | PB0 (SS) — SPI slave select / general I/O |
| Pin produk 11 | PB1 (SCK) — SPI clock / general I/O |
| Pin produk 12 | PB2 (MOSI) — SPI master data out / general I/O |
| Pin produk 13 | PB3 (MISO) — SPI master data in / general I/O |
| Pin produk 14 | PB4 (OC0) — Timer0 output compare / PWM |
| Pin produk 15 | PB5 (OC1A) — Timer1 output compare A / PWM |
| Pin produk 16 | PB6 (OC1B) — Timer1 output compare B / PWM |
| Pin produk 17 | PB7 (OC2/OC1C) — Timer2 output compare / Timer1 output compare C |
| Pin produk 18 | PG3 (TOSC2) — Timer oscillator output (32 kHz RTC crystal) |
| Pin produk 19 | PG4 (TOSC1) — Timer oscillator input (32 kHz RTC crystal) |
| Pin produk 20 | RESET — Reset input (active low) |
| Pin produk 21 | VCC — Digital supply voltage |
| Pin produk 22 | GND — Digital ground |
| Pin produk 23 | XTAL2 — System crystal oscillator output |
| Pin produk 24 | XTAL1 — System crystal oscillator input |
| Pin produk 25 | PD0 (SCL/INT0) — TWI clock / external interrupt 0 |
| Pin produk 26 | PD1 (SDA/INT1) — TWI data / external interrupt 1 |
| Pin produk 27 | PD2 (RXD1/INT2) — USART1 receive / external interrupt 2 |
| Pin produk 28 | PD3 (TXD1/INT3) — USART1 transmit / external interrupt 3 |
| Pin produk 29 | PD4 (ICP1) — Timer1 input capture |
| Pin produk 30 | PD5 (XCK1) — USART1 external clock |
| Pin produk 31 | PD6 (T1) — Timer1 external counter input |
| Pin produk 32 | PD7 (T2) — Timer2 external counter input |
| Pin produk 33 | PG0 (WR) — External memory write strobe |
| Pin produk 34 | PG1 (RD) — External memory read strobe |
| Pin produk 35 | PC0 (A8) — External memory address line 8 / general I/O |
| Pin produk 36 | PC1 (A9) — External memory address line 9 / general I/O |
| Pin produk 37 | PC2 (A10) — External memory address line 10 / general I/O |
| Pin produk 38 | PC3 (A11) — External memory address line 11 / general I/O |
| Pin produk 39 | PC4 (A12) — External memory address line 12 / general I/O |
| Pin produk 40 | PC5 (A13) — External memory address line 13 / general I/O |
| Pin produk 41 | PC6 (A14) — External memory address line 14 / general I/O |
| Pin produk 42 | PC7 (A15) — External memory address line 15 / general I/O |
| Pin produk 43 | PG2 (ALE) — External memory address latch enable |
| Pin produk 44 | PA7 (AD7) — External memory address/data line 7 / general I/O |
| Pin produk 45 | PA6 (AD6) — External memory address/data line 6 / general I/O |
| Pin produk 46 | PA5 (AD5) — External memory address/data line 5 / general I/O |
| Pin produk 47 | PA4 (AD4) — External memory address/data line 4 / general I/O |
| Pin produk 48 | PA3 (AD3) — External memory address/data line 3 / general I/O |
| Pin produk 49 | PA2 (AD2) — External memory address/data line 2 / general I/O |
| Pin produk 50 | PA1 (AD1) — External memory address/data line 1 / general I/O |
| Pin produk 51 | PA0 (AD0) — External memory address/data line 0 / general I/O |
| Pin produk 52 | VCC — Digital supply voltage |
| Pin produk 53 | GND — Digital ground |
| Pin produk 54 | PF0 (ADC0) — ADC input 0 / general I/O |
| Pin produk 55 | PF1 (ADC1) — ADC input 1 / general I/O |
| Pin produk 56 | PF2 (ADC2) — ADC input 2 / general I/O |
| Pin produk 57 | PF3 (ADC3) — ADC input 3 / general I/O |
| Pin produk 58 | PF4 (ADC4/TCK) — ADC input 4 / JTAG test clock |
| Pin produk 59 | PF5 (ADC5/TMS) — ADC input 5 / JTAG test mode select |
| Pin produk 60 | PF6 (ADC6/TDO) — ADC input 6 / JTAG test data out |
| Pin produk 61 | PF7 (ADC7/TDI) — ADC input 7 / JTAG test data in |
| Pin produk 62 | AREF — ADC analog reference voltage |
| Pin produk 63 | AGND — Analog ground |
| Pin produk 64 | AVCC — ADC supply voltage |
Aplikasi Umum
ATMEGA128L-8MU cocok untuk 6 aplikasis: 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.
Direkomendasikan
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.
Direkomendasikan
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.
Direkomendasikan
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.
Direkomendasikan
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.
Direkomendasikan
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.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk ATMEGA128L-8MU — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | 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 |
Diferensiator Kunci
- ATmega103 legacy compatibility with true pin compatibility (vsATMEGA1281V-8MU)
- Wider low-voltage range than the 16 MHz sibling (vsATMEGA1281-16MUR)
- Lower SRAM than the migration family (vsATMEGA1281V-8MU)
Catatan Desain
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.
Informasi Konformitas
FindIC lists the ATMEGA128L-8MU as GREEN (Microchip RoHS-compliant, halogen-free packaging). REACH and conflict-minerals declarations not present in provided data.
