ATMEGA128L-8AC
ATMEGA128L-8AC - 8-bit AVR MCU, 128KB Flash, 8MHz, 64-TQFP | Microchip
The Microchip (formerly Atmel) ATMEGA128L-8AC is a high-performance, low-power 8-bit AVR RISC-based microcontroller built around a 128KB In-System Programmable Flash memory with Read-While-Write support, 4KB EEPROM, 4KB SRAM, and a 64-pin TQFP (14x14 mm) package. It executes instructions in a single clock cycle, achieving throughputs approaching 1 MIPS per MHz, and is offered with an 8 MHz maximum operating frequency at the low-voltage (2.7V-5.5V) L-grade rating.
An 8-bit microcontroller (MCU) is a programmable logic device that integrates a CPU, memory (Flash, SRAM, EEPROM), and peripherals (ADC, timers, communication interfaces) on a single silicon die. Within the broader taxonomy, the ATMEGA128L belongs to the AVR RISC microcontroller family, which in turn is part of the embedded microcontroller category, sitting under microcontrollers and integrated circuits in the electronic component hierarchy. ATmega devices specifically use a modified Harvard architecture with separate program and data buses plus a dedicated EEPROM bus, an arrangement that lets the CPU fetch instructions while reading or writing EEPROM in the same cycle - ideal for data-logging applications.
Key features of the ATMEGA128L-8AC include 53 general-purpose I/O lines, 32 general-purpose working registers, an 8-channel 10-bit ADC, two USARTs, a byte-oriented Two-Wire Serial Interface (TWI, I2C-compatible), an SPI serial interface, four flexible Timer/Counters with compare modes and PWM, a real-time counter with separate oscillator, a JTAG interface for on-chip debug, six sleep modes for power optimization, and a watchdog timer with on-chip oscillator. The 64-pin TQFP (14x14) surface-mount package provides 53 usable I/O pins with the remainder allocated to power, ground, reset, crystal, and JTAG signals.
The die uses an enhanced RISC architecture with 133 powerful instructions, most executed in a single clock cycle, enabling deterministic interrupt latency and code-density advantages over CISC alternatives. The internal bandgap reference, brown-out detector, and on-chip debug logic reduce external component count. The 'L' suffix designates the low-voltage variant (2.7V-5.5V), distinguished from the standard ATMEGA128 (4.5V-5.5V); the 'C' suffix indicates the commercial 0C to +70C temperature range, and the 'AC' suffix the TQFP package.
Typical applications include industrial control systems, building automation, HVAC controllers, low-power sensor nodes, data loggers, and battery-powered instrumentation where the 2.7V-5.5V supply range and six programmable sleep modes (down to sub-microamp standby currents typical of L-grade devices) provide extended battery life. The 128KB of Flash and 4KB EEPROM enable substantial on-board firmware storage with non-volatile parameter retention across power cycles.
When designing with this part, plan ISP (In-System Programming) header accessibility from the start: the MOSI, MISO, SCK, and RESET pins must reach an external header for field updates. The L-grade 2.7V minimum also means brown-out detection (BOD) thresholds must be configured correctly - the default BOD level is below the safe minimum for 8 MHz operation and should be raised via fuses for production firmware.
This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes that go beyond the Atmel/Microchip datasheet coverage.
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