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ATMEGA328PB-MU - 8-Bit AVR MCU 20MHz 32KB Flash | Microchip
ATMEGA328PB-MU

ATMEGA328PB-MU - 8-Bit AVR MCU 20MHz 32KB Flash | Microchip

The Microchip Technology ATMEGA328PB-MU is a picoPower 8-bit AVR RISC microcontroller delivering 20 MHz maximum clock frequency, 32 KB of ISP Flash memory, and 2 KB of SRAM in a 32-pin VFQFN (5x5 mm) surface-mount package. It achieves throughput close to 1 MIPS per MHz, and the -MU suffix denotes the industrial temperature grade of -40C to +85C in the QFN/MLF package. An 8-bit AVR microcontroller is a self-contained computing IC that integrates a RISC CPU core, program Flash, SRAM, EEPROM, and peripherals such as timers, USART, SPI, and I2C on a single die. Within the power-management hierarchy of embedded systems, it functions as the system controller, executing application firmware while managing sensors, actuators, and communication links. Key features include two 8-bit timer/counters with PWM, one 16-bit timer/counter, and enhanced peripheral sets relative to the ATmega328P: two independent I2C interfaces, two SPI interfaces, additional GPIO on PORTE, and a 10-bit ADC with 7 multiplexed channels. The picoPower technology supports multiple sleep modes for battery-operated designs, and the device executes powerful instructions in a single clock cycle. The AVR enhanced RISC architecture pairs 32 general-purpose working registers directly with the ALU, allowing most instructions to complete in one cycle and delivering deterministic, interrupt-friendly real-time behavior. Flash read-while-write capability enables in-system self-programming via a boot loader, and ISP plus debugWIRING support simplifies field updates and development. Typical applications include Arduino-compatible boards and maker platforms, industrial sensor nodes and HMI controllers, and consumer appliances requiring low-cost, low-power control with robust community tooling. When designing with this device, verify that your firmware and fuse settings are written for the 328PB signature, because the added Port E pins (19 and 22 in the QFN) change connectivity relative to the ATmega328P footprint. This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not consolidated in the manufacturer datasheet.

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ATMEGA328PB-MUR - 8-Bit AVR MCU 20MHz 32KB Flash QFN-32 | Microchip
ATMEGA328PB-MUR

ATMEGA328PB-MUR - 8-Bit AVR MCU 20MHz 32KB Flash QFN-32 | Microchip

The Microchip Technology ATMEGA328PB-MUR is a low-power 8-bit AVR RISC microcontroller delivering 20 MHz maximum clock frequency, 32 KB of ISP Flash memory, and 4 KB SRAM in a 32-pin VFQFN (5x5 mm) package rated for industrial temperatures from -40C to +85C. As the picoPower successor to the ATmega328P, it achieves throughputs close to 1 MIPS per MHz. An 8-bit AVR microcontroller is a Harvard-architecture processor that executes most instructions in a single clock cycle, combining program Flash, data SRAM, and EEPROM on one die. Within the power management and embedded control hierarchy, MCUs like the ATmega328PB sit at the heart of industrial sensors, consumer appliances, and hobbyist platforms such as Arduino-compatible boards. Key differentiating features include two 8-bit timer/counters and two 16-bit timer/counters with compare modes and PWM, one UART with hardware LIN support, two I2C (TWI) interfaces, and two SPI interfaces - double the peripheral set of the ATmega328P. An 11-channel 10-bit ADC with differential programmable-gain inputs, 27 general purpose I/O lines, and a 32-general-purpose-register file round out the analog and digital capability. The picoPower technology suite provides multiple sleep modes (Idle, ADC Noise Reduction, Power-save, Power-down, Standby, Extended Standby) with wake-up via interrupt, plus an on-chip debug capability via debugWIRE. The AVR enhanced RISC core executes powerful instructions in single cycles, and self-programmable Flash with read-while-write support enables in-system programming and boot-loader firmware updates without an external programmer. Typical applications include battery-powered sensor nodes where picoPower sleep modes extend battery life, industrial control panels using the dual SPI/I2C buses for multi-peripheral designs, and Arduino-compatible consumer products. The 32-VFQFN 5x5 mm footprint suits space-constrained PCBs while remaining hand-solderable with hot air. Design consideration: the ATmega328PB is software-backward-compatible with the ATmega328P but exposes its added Port E and second I2C/SPI buses on pins that differ, so verify the 32-pin VFQFN pin map before reusing a legacy ATmega328P footprint. This page synthesizes distributor pricing, drop-in alternatives, application guidance, and design notes not found in the manufacturer datasheet alone.

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ATMEGA329-16AI - 8-bit AVR MCU 32KB Flash 16MHz LCD | Microchip
ATMEGA329-16AI

ATMEGA329-16AI - 8-bit AVR MCU 32KB Flash 16MHz LCD | Microchip

The Microchip Technology ATMEGA329-16AI is an 8-bit AVR RISC microcontroller with 32KB ISP Flash memory, 2KB SRAM, 1KB EEPROM, a 16MHz maximum core clock, and an integrated segment LCD controller, housed in a 64-pin TQFP (14x14 mm) package. An 8-bit AVR microcontroller is a member of the broader microcontroller (MCU) family of integrated circuits that combine a processor core, program memory, data memory, and peripherals on a single chip. Within the power-management-free general-purpose MCU hierarchy, AVR devices sit alongside PIC and ARM Cortex-M MCUs, executing most of their 130 powerful instructions in a single clock cycle to deliver throughput approaching 1 MIPS per MHz. Key features of the ATMEGA329-16AI include 54 general-purpose I/O lines, 32 general-purpose working registers, a JTAG interface for on-chip debugging and boundary scan, and self-programming Flash with read-while-write capability. Peripherals include an 8-channel 10-bit ADC, SPI, UART/USART, and USI serial interfaces, plus Brown-out Detect/Reset, Power-on Reset, PWM outputs, a Watchdog Timer, and the segment LCD driver that distinguishes this device from the LCD-less ATmega328 family. Architecturally, the AVR uses a Harvard structure with separate program and data buses, enabling single-cycle instruction fetch and execution. The -16AI ordering code specifies 16MHz speed grade, industrial temperature range of -40C to +85C, and TQFP packaging. Operating supply spans 2.7V to 5.5V, with the full 16MHz operation targeted at the 4.5V to 5.5V range. Typical applications include industrial control panels driving segment LCDs, utility metering and instrumentation where the integrated LCD controller reduces external component count, and consumer electronics requiring robust 5V operation with in-system programmable firmware updates. Design consideration: validate that the crystal frequency and supply voltage pair keeps the device within its safe operating envelope - at 5V the 16MHz grade is comfortable, but at 2.7V the maximum safe clock frequency drops substantially. This page synthesizes distributor availability data, same-family drop-in alternatives, and practical design notes not consolidated in the manufacturer datasheet.

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ATMEGA329-16AU - 8-bit AVR MCU 16MHz 32KB Flash LCD | Microchip
ATMEGA329-16AU

ATMEGA329-16AU - 8-bit AVR MCU 16MHz 32KB Flash LCD | Microchip

The Microchip Technology ATMEGA329-16AU is an 8-bit AVR ATmega microcontroller with 32 KB ISP Flash, 16 MHz max clock, and an on-chip LCD controller, housed in a 64-pin TQFP (14x14 mm) surface-mount package. It operates from a 4.5 V to 5.5 V supply at the 16 MHz speed grade. An AVR ATmega microcontroller is an 8-bit RISC-based MCU belonging to the broader microcontroller and embedded processor family. AVR devices execute most of their 130-plus powerful instructions in a single clock cycle, giving high code efficiency from small program memory. Microcontrollers of this class combine CPU, program Flash, data SRAM, EEPROM, and peripherals such as timers, USART, ADC, and - in this device - a complete LCD driver on one silicon die, forming the heart of an embedded system. Key features include 32 KB of self-programming ISP Flash with read-while-write capability, 1 KB EEPROM, 2 KB SRAM, and 54 general purpose I/O lines. A JTAG interface provides boundary-scan, on-chip debugging, and programming. The integrated LCD controller with internal contrast control drives segment LCDs directly, a capability uncommon in general-purpose MCUs of this era, and three flexible timers plus a 10-bit ADC round out the analog and timing peripherals. Architecturally, the device uses the AVR enhanced RISC core with 32 general purpose working registers directly connected to the ALU, allowing most single-cycle execution. In-system programmable Flash enables firmware updates on the assembled board through SPI or JTAG, reducing rework cost in production. Typical applications include utility metering with segment LCD displays, industrial panels and human-machine interfaces, and battery-powered or line-powered instrumentation requiring direct LCD drive, timers, and ADC acquisition. Design consideration: at 16 MHz the part must run from 4.5 V to 5.5 V; for 3 V systems choose a V speed grade variant and reduce the clock accordingly, and always place 100 nF decoupling on both VCC pins. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA329-16AUR - AVR 8-bit MCU 16MHz 32KB LCD | Microchip
ATMEGA329-16AUR

ATMEGA329-16AUR - AVR 8-bit MCU 16MHz 32KB LCD | Microchip

The Microchip Technology ATMEGA329-16AUR is a high-performance, low-power 8-bit AVR RISC microcontroller with 32 KB ISP Flash memory, 1 KB EEPROM, 2 KB SRAM, an integrated LCD controller, and a maximum clock speed of 16 MHz, housed in a 64-pin TQFP (14x14 mm, 0.8 mm pitch) surface-mount package. It operates from a 4.5 V to 5.5 V supply and is qualified for an industrial temperature range. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most of its 131 powerful instructions in a single clock cycle, sitting within the broader hierarchy of microcontrollers as a member of the AVR ATmega family of power-management-capable embedded processors. The integrated segment LCD driver distinguishes the ATmega329 from general-purpose parts such as the ATmega328P, making it a strong fit for battery-fronted display products. Key features include read-while-write self-programming Flash, 54 general-purpose I/O lines, 32 general-purpose working registers, a JTAG (IEEE 1149.1 compliant) boundary-scan and on-chip debug interface, an 8-channel 10-bit ADC, and an on-chip LCD controller capable of driving up to 4x25 segment/common combinations with three selectable duty schemes. The advanced RISC architecture achieves up to 16 MIPS throughput at 16 MHz. Technically, the device combines a fast single-cycle ALU with in-system self-programmable Flash, allowing firmware updates in the field without a separate programmer. Power management is handled through idle, ADC noise reduction, power-save, power-down, and standby sleep modes. Typical applications include utility metering with LCD displays, handheld measurement instruments, industrial control panels, and consumer appliances requiring integrated segment-LCD drive. A key design consideration is the 5 V supply requirement: the -16 speed grade needs 4.5 V to 5.5 V, so battery designs should consider the ATmega329V low-voltage variant instead. This page synthesizes distributor pricing, drop-in alternatives within the same 64-TQFP footprint, and practical design notes not found in the manufacturer datasheet.

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ATMEGA329-16MU - 8-Bit AVR MCU 16MHz 32KB LCD | Microchip
ATMEGA329-16MU

ATMEGA329-16MU - 8-Bit AVR MCU 16MHz 32KB LCD | Microchip

The Microchip Technology ATMEGA329-16MU is a high-performance, low-power 8-bit AVR RISC microcontroller with 32 KB ISP Flash memory, 1 KB EEPROM, 2 KB SRAM, an integrated LCD controller, and a maximum clock speed of 16 MHz, housed in a 64-pad QFN (9 x 9 mm) package. A microcontroller (MCU) is a single integrated circuit that combines a processor core, memory, and programmable peripherals into one chip, forming the lowest programmable layer of an embedded system hierarchy that ranges from discrete logic up to full application processors. The AVR family, originally developed by Atmel and now part of Microchip Technology, is an advanced RISC architecture executing 131 powerful instructions, most in a single clock cycle, with 32 general-purpose working registers directly connected to the ALU. Key features of the ATMEGA329 include 54 general purpose I/O lines, an on-chip LCD controller capable of driving up to 25 segments x 4 commons, a JTAG interface for on-chip debugging and programming, read-while-write self-programming Flash, and an 8-channel 10-bit ADC. Supply voltage is 4.5 V to 5.5 V for the 16 MHz speed grade, fitting standard 5 V industrial rails. The Harvard architecture separates program and data buses, allowing fetch and execution in parallel and delivering up to 16 MIPS throughput at 16 MHz. In-System Programmable Flash permits firmware updates over SPI without removing the device from the PCB, and the JTAG boundary-scan capability supports production test flows. Typical applications include utility metering with segmented LCD displays, industrial control panels, battery-powered instrumentation, and building automation front-ends, where the integrated LCD controller removes the need for a separate LCD driver IC. When designing, verify that the 4.5 V to 5.5 V supply window is met before running at the full 16 MHz clock; for 3 V systems choose the V speed grade variant instead. This page synthesizes verified distributor data, drop-in same-family alternatives, and practical design guidance not consolidated in the manufacturer datasheet.

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ATMEGA329-16MUR - 32KB Flash 16MHz AVR MCU, 64-QFN | Microchip
ATMEGA329-16MUR

ATMEGA329-16MUR - 32KB Flash 16MHz AVR MCU, 64-QFN | Microchip

The Microchip Technology ATMEGA329-16MUR is a high-performance, low-power 8-bit AVR RISC microcontroller with 32 KB ISP Flash memory, 1 KB EEPROM, 2 KB SRAM, and a maximum clock speed of 16 MHz, operating from a 4.5V to 5.5V supply and housed in a 64-pin QFN (9x9 mm) package with exposed pad. It integrates an LCD controller driving up to 25 segments x 4 commons, 54 general purpose I/O lines, a 10-bit ADC, and a JTAG interface for on-chip debugging and programming. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, sitting within the broader hierarchy of embedded processors: microcontroller -> embedded processor -> semiconductor device. The AVR ATmega family is widely used for cost-sensitive embedded control where flash self-programming, low power modes, and rich peripherals are required without an external memory bus. Key features include 131 powerful instructions with mostly single-cycle execution, read-while-write self-programming flash, 32 general purpose working registers, an on-chip 10-bit ADC with up to 8 channels, and an integrated segment LCD driver that eliminates an external LCD controller. These capabilities reduce bill-of-materials cost in battery-meter, metering, and panel-display designs. Technically, the ATmega329 combines an AVR core running up to 16 MIPS at 16 MHz with six power-saving modes, including power-down at very low current. The JTAG boundary-scan capability complies with IEEE 1149.1-style test access for board-level test, and in-circuit serial programming (ICSP) via SPI simplifies production programming. The 64-QFN 9x9 mm, 0.8 mm pitch package suits compact two-layer and four-layer boards with good thermal dissipation through the exposed pad. Typical applications include LCD-equipped industrial panels, utility and energy metering front ends, building automation controllers, and consumer appliances requiring segment-LCD user interfaces. The ADC and analog comparator support sensor acquisition tasks directly. Design consideration: this is the 16 MHz / 4.5V to 5.5V speed-voltage grade; for 2.7V to 5.5V systems at up to 10 MHz, the ATmega329V variant must be selected instead, as the -16 suffix guarantees full timing only within 4.5V to 5.5V. This page synthesizes distributor pricing, drop-in alternatives, design notes, and FAQ content not found in the manufacturer datasheet, giving engineers a single citable reference for the ATMEGA329-16MUR.

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ATMEGA3290-16AI - AVR 8-bit MCU 16MHz 32KB TQFP-100 | Microchip
ATMEGA3290-16AI

ATMEGA3290-16AI - AVR 8-bit MCU 16MHz 32KB TQFP-100 | Microchip

The Microchip Technology ATMEGA3290-16AI is a picoPower AVR RISC 8-bit microcontroller with 32 KB ISP Flash, 2 KB SRAM, 1 KB EEPROM, and 16 MHz maximum clock speed, supplied in a 100-pin TQFP (14 x 14 mm) package for industrial temperature ranges of -40C to +85C. A microcontroller unit (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and peripherals into one chip, forming the lowest tier of the embedded processing hierarchy below application processors and system-on-chip devices. The AVR ATmega family uses an advanced RISC architecture with 130 mostly single-cycle instructions and 32 general-purpose working registers, allowing one instruction per clock cycle for efficient C and assembly code execution. Key features of the ATMEGA3290-16AI include self-programming Flash with read-while-write capability for in-system updates, 69 general-purpose I/O lines for large button- and display-intensive designs, an integrated LCD controller driving up to 100/132 LCD segment configurations, and serial connectivity via SPI, UART/USART, and USI interfaces. The picoPower technology supports multiple sleep modes, minimizing power draw in battery-operated and standby-critical systems. Technically, the device operates from 2.7 V to 5.5 V and achieves 16 MIPS throughput at 16 MHz. The built-in LCD driver eliminates an external LCD controller, reducing BOM cost and board area in segmented-display products. The JTAG interface supports on-chip debugging and boundary-scan testing of the dense 100-lead footprint. Typical applications include industrial control panels with segmented LCDs, utility metering front ends, HVAC and appliance user interfaces, and security or access-control terminals where many I/O and a local display coexist on one controller. Design consideration: clock selection and BOD fuse settings strongly influence both power consumption and reset reliability; verify fuse configuration before production programming, since the TQFP-100 package makes field rework impractical. This page adds distributor pricing context, drop-in alternatives within the ATmega LCD family, and practical design guidance synthesized from multiple sources beyond the manufacturer datasheet.

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ATMEGA3290A-AU - 8-bit AVR MCU 32KB Flash LCD | Microchip
ATMEGA3290A-AU

ATMEGA3290A-AU - 8-bit AVR MCU 32KB Flash LCD | Microchip

The Microchip Technology ATMEGA3290A-AU is an 8-bit AVR RISC microcontroller with 32KB ISP Flash, 2KB SRAM, 1KB EEPROM, and an integrated LCD controller driving up to 4x40 segments, packaged in a 100-pin TQFP (14x14 mm) footprint rated for 20 MHz operation. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor in the broader microcontroller (MCU) hierarchy: microcontroller -> embedded processor -> system-on-chip building block. AVR devices execute most of their 130 powerful instructions in a single clock cycle, and the ATmega family adds in-system programmable (ISP) Flash with read-while-write support, making field firmware updates straightforward without a separate programmer socket. Key features of the ATMEGA3290A-AU include 69 general-purpose I/O lines, 32 general-purpose working registers, a JTAG interface for boundary-scan, on-chip debugging and programming, and a complete on-chip LCD controller with internal contrast control. The internal oscillator option reduces external component count, while three flexible timers (two 8-bit with separate prescaler and compare mode, one 16-bit) cover PWM, capture, and timing tasks. Technically, the ATmega3290A belongs to the ATmega3290/3290P/6490 LCD megAVR family. The advanced RISC pipeline delivers close to 20 MIPS at 20 MHz, and the LCD driver directly drives segment glass for metering and human-machine interface panels, removing the need for an external LCD controller. EEPROM retention and ISP Flash endurance support data logging and frequent firmware updates in industrial products. Typical applications include utility metering displays, industrial HMI panels with segmented LCDs, building automation keypads, and battery-powered instrumentation where the low-power AVR core and integrated LCD driver minimize board area and quiescent current. When designing with this part, confirm the exact operating voltage range and LCD bias configuration against the manufacturer datasheet, and reserve JTAG header access for in-circuit debug. Note the distinction between the 'A' (standard) and 'P'/'PA' (picoPower) variants when sleep current is critical. This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA3290P-20AU - AVR 8-Bit MCU 20MHz 32KB Flash TQFP-100 | Microchip
ATMEGA3290P-20AU

ATMEGA3290P-20AU - AVR 8-Bit MCU 20MHz 32KB Flash TQFP-100 | Microchip

The Microchip Technology ATMEGA3290P-20AU is a picoPower AVR 8-bit RISC microcontroller delivering 20 MHz maximum clock frequency, 32 KB of ISP self-programming Flash memory, and 69 general-purpose I/O lines in a 100-pin TQFP (14x14 mm, 0.8 mm pitch) package, operating from a 4.5 V to 5.5 V supply. An 8-bit AVR microcontroller is a Harvard-architecture processor that executes most instructions in a single clock cycle, positioning it within the broader hierarchy of microcontroller units (MCUs) under the power-management and embedded-control category. The ATmega family from Atmel (now Microchip Technology) remains one of the most widely deployed 8-bit MCU platforms in industrial and consumer embedded design. Key features of the ATMEGA3290P-20AU include 1 KB of EEPROM with self-programming Flash read-while-write capability, 2 KB of internal SRAM, 32 general-purpose working registers, and the picoPower low-power technology for battery-sensitive designs. The device integrates an on-chip LCD controller with segment drive capability, making it distinct from LCD-less siblings such as the ATmega3250 series in footprint-compatible design reuse scenarios. The advanced RISC core executes 131 powerful instructions, most in a single clock cycle, with hardware multipliers and in-circuit debugging (debugWIRE) plus In-Circuit Serial Programming (ICSP) support through tools such as the MPLAB SNAP programmer connected via an 8-pin SIL connector using two device I/O pins and the reset line. Typical applications include industrial instrumentation with integrated segment-LCD user interfaces, building automation panels, metering equipment, and portable test instruments where 5 V noise immunity, large I/O counts, and LCD drive are required on a single chip. A key design consideration is that the -20AU speed grade requires a 4.5 V to 5.5 V supply for full 20 MHz operation; lower-voltage picoPower variants such as the ATMEGA3250V-8AUR trade clock speed for supply range. This page adds value beyond the datasheet by consolidating distributor pricing (from $12.02 at LCSC as of 2026-09-17), verified drop-in alternatives within the same 100-TQFP footprint, cross-part comparison tables, and practical design guidance not found on standard distributor pages.

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ATMEGA3290P-20AUR - AVR 8-Bit MCU 32KB 20MHz | Microchip
ATMEGA3290P-20AUR

ATMEGA3290P-20AUR - AVR 8-Bit MCU 32KB 20MHz | Microchip

The Microchip Technology ATMEGA3290P-20AUR is a picoPower AVR 8-bit RISC microcontroller with 32 KB ISP Flash memory, 2 KB SRAM, 1 KB EEPROM, and 69 general-purpose I/O lines, running at up to 20 MHz in a 100-pin TQFP (14x14 mm) package rated for the industrial temperature range (-40C to +85C) and supplied on tape and reel. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, making it a staple of the wider MCU hierarchy: microcontroller unit -> embedded processor -> semiconductor. The AVR ATmega family sits within Microchip's low-power CMOS portfolio, and the 'P' suffix in ATMEGA3290P denotes the picoPower-optimized die for low active and sleep currents. Key features include 130 powerful instructions, most executed in one clock cycle; 32 general-purpose working registers; read-while-write self-programming Flash; an on-chip LCD controller/driver suited to segmented glass displays; and In-Circuit Serial Programming (ICSP) with on-chip debug via JTAG. The 20 MHz rating enables 20 MIPS peak throughput at 5 V. The picoPower technology reduces power consumption in idle, power-save, power-down, and standby sleep modes, while the wide 2.7V to 5.5V supply range supports both 3.3V and 5V designs, with 5V operation required to reach the full 20 MHz speed grade. Typical applications include industrial HMI panels with segmented LCDs, battery-powered instruments and meters, building and HVAC controllers, and consumer appliances where the 69 GPIO lines drive keys, LEDs, relays, and displays from a single chip. When designing with this device, remember that the 20 MHz grade is only guaranteed across the full industrial range at 4.5V to 5.5V; at 3.3V the safe maximum clock is lower per the frequency-versus-voltage curve in the datasheet. This page synthesizes verified distributor data, drop-in ATmega family alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA3290PA-AU - 8-Bit AVR MCU, 32KB Flash, 20MHz | Microchip
ATMEGA3290PA-AU

ATMEGA3290PA-AU - 8-Bit AVR MCU, 32KB Flash, 20MHz | Microchip

The Microchip Technology ATMEGA3290PA-AU is a picoPower AVR 8-bit RISC microcontroller with 32 KB ISP Flash memory, 1 KB EEPROM, 2 KB SRAM, 69 general-purpose I/O lines, and a maximum clock speed of 20 MHz, housed in a 100-pin TQFP (14 x 14 mm) package. It also integrates an on-chip LCD controller with internal contrast control, making it one of the few MCU families with native segment-LCD drive capability. An 8-bit AVR microcontroller is a Harvard-architecture processor that executes most of its instructions in a single clock cycle. Within the power-management IC hierarchy, the ATmega family serves as the main system controller, sitting above simple logic devices and below 32-bit application processors, and is widely used for embedded control with human-machine interfaces. Key differentiating features include the picoPower technology that reduces power consumption in active, idle, and standby modes, 131 powerful instructions with mostly single-cycle execution, 32 general-purpose working registers, and an AVR-enhanced RISC architecture. The device operates from a 1.8 V to 5.5 V supply, supporting both battery-powered and 5 V industrial designs. Technically, the ATMEGA3290PA combines self-programming Flash with read-while-write capability, a JTAG interface for boundary-scan, on-chip debugging, and programming, a complete LCD controller driving segment and common lines with internal contrast control, plus standard AVR peripherals including timers, USART, SPI, and an ADC. The picoPower variant (PA suffix) improves on the earlier 3290P with lower quiescent and power-down currents. Typical applications include utility metering with LCD displays, battery-powered handheld instruments, industrial control panels, and building-automation front ends where a segment LCD and low average power are mandatory. A key design consideration is that the LCD controller requires careful selection of the LCD drive mode and frame frequency to balance contrast against power consumption; at 1.8 V operation the maximum clock frequency must also be derated per the datasheet speed-versus-voltage curve. This page synthesizes distributor availability, drop-in family alternatives, and practical design notes beyond what the manufacturer datasheet provides.

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ATMEGA3290PA-AUR - 8-Bit AVR MCU 32KB 20MHz TQFP-100 | Microchip
ATMEGA3290PA-AUR

ATMEGA3290PA-AUR - 8-Bit AVR MCU 32KB 20MHz TQFP-100 | Microchip

The Microchip Technology ATMEGA3290PA-AUR is an 8-bit AVR ATmega microcontroller with 32KB (16K x 16) In-System Programmable Flash, 2KB SRAM, 1KB EEPROM, a 20MHz maximum clock, and an integrated 4x40 segment LCD driver, housed in a 100-pin TQFP (14x14 mm) package. An 8-bit microcontroller is a single-chip processor whose data bus is eight bits wide, executing one byte per instruction cycle. Within the power-management hierarchy, it integrates CPU, memory, timers, communication peripherals, and an LCD controller on one die, replacing multi-chip solutions and reducing board area, BOM cost, and system power. The AVR family is a Harvard-architecture RISC line originally developed by Atmel, now part of Microchip Technology. Key features include 131 powerful instructions with mostly single-clock-cycle execution, high throughput of up to 20 MIPS at 20MHz, and advanced power-management modes including idle, power-save, power-down, standby, and extended standby that exploit the picoPower technology of the PA suffix for ultra-low sleep currents. The embedded 4x40 segment LCD driver directly drives glass displays without external driver ICs, a differentiator that defines this device family. Architecturally, the device uses a Harvard design with separate program and data buses, self-programmable Flash for boot-loader firmware updates, and on-chip debug via debugWIRE. Peripherals include two 8-bit timer/counters with separate prescaler and compare mode, one 16-bit timer/counter, USART, SPI, and analog comparators typical of the ATmega LCD family. Typical applications include utility metering (electricity, water, gas meters with LCD glass), industrial control panels with segmented displays, and portable instruments where the picoPower sleep modes extend battery life for years. Design consideration: full 20MHz operation requires a supply of 4.5V to 5.5V; derate clock speed for lower supply voltages per the Speed/Grade versus Voltage curve in the manufacturer datasheet. This page synthesizes distributor availability, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA3290PV-10AUR - 8-bit AVR MCU, 32KB, LCD, TQFP-100 | Microchip
ATMEGA3290PV-10AUR

ATMEGA3290PV-10AUR - 8-bit AVR MCU, 32KB, LCD, TQFP-100 | Microchip

The Microchip Technology ATMEGA3290PV-10AUR is a picoPower AVR 8-bit microcontroller with 32KB (16K x 16) ISP Flash memory, 1KB EEPROM, 2KB SRAM, and a maximum clock frequency of 10 MHz, housed in a 100-pin TQFP (14x14 mm) surface-mount package. It operates from a 1.8V to 5.5V supply and integrates an on-chip segment LCD controller, making it a complete display-capable embedded controller. A microcontroller unit (MCU) is a single-chip computer that combines a processor core, program memory, data memory, and peripherals on one die. This device belongs to the AVR ATmega family of 8-bit RISC microcontrollers, positioned in the broader hierarchy of embedded processors used in industrial control, metering, and human-interface products. The AVR architecture executes most of its powerful instruction set in a single clock cycle, delivering up to 10 MIPS throughput at 10 MHz. Key features include in-system self-programmable Flash with read-while-write capability, picoPower low-power technology for battery-operated designs, an integrated LCD driver that offloads segment driving from software, 69 general-purpose I/O lines, and 32 general-purpose working registers directly connected to the ALU. The wide 1.8V to 5.5V operating range allows direct battery connection without a regulator in low-power systems. Technically, the device uses an advanced RISC core with single-cycle instruction execution, hardware multiplier, and nested interrupt controller. The 32KB Flash is organized for 10,000 write cycles, while the 1KB EEPROM provides non-volatile parameter storage. Peripherals typically include USART, SPI, and JTAG-based debugging on the ATmega3290 family, supporting both development and production programming. Typical applications include utility metering with LCD readouts, battery-powered industrial instruments, building automation panels, and handheld measurement devices where the integrated segment LCD controller, low active current, and five-volt tolerance simplify the bill of materials. When designing with this device, respect the 10 MHz maximum frequency of the V-grade speed bin and use decoupling capacitors on each supply pin; the LCD controller requires proper bias network configuration per the manufacturer datasheet. This page synthesizes distributor pricing, drop-in family alternatives, and practical design guidance not consolidated in the manufacturer datasheet.

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ATMEGA3290V-8AU - 8MHz AVR MCU 32KB Flash LCD | Microchip
ATMEGA3290V-8AU

ATMEGA3290V-8AU - 8MHz AVR MCU 32KB Flash LCD | Microchip

The Microchip Technology ATMEGA3290V-8AU is an 8-bit AVR ATmega microcontroller with 32 KB (16K x 16) ISP Flash memory, 1 KB EEPROM, 2 KB SRAM, and a maximum clock speed of 8 MHz, housed in a 100-pin TQFP (14 x 14 mm) surface-mount package. It integrates an LCD controller and a 10-bit ADC, targeting segment-LCD-driven embedded systems. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most of its 131 instructions in a single clock cycle. In the system hierarchy, it sits within the power-management and human-interface layer of embedded designs, combining CPU, nonvolatile memory, SRAM, peripherals, and general-purpose I/O in one chip. The ATmega family from Microchip (formerly Atmel) is one of the most widely deployed 8-bit MCU platforms in industrial and consumer electronics. Key features include the picoPower/AVR low-power CMOS core with multiple sleep modes, 69 general-purpose I/O lines, an integrated segment LCD driver, a 10-bit ADC, SPI, USART and two-wire (I2C) serial interfaces, and self-programming Flash with read-while-write support for in-system and boot-loader firmware updates. The V speed/voltage grade supports operation at up to 8 MHz across the extended voltage range, while the AU suffix denotes the industrial TQFP package. Architecturally, the device provides 32 general-purpose working registers directly connected to the ALU, giving high code density and fast single-cycle register access. The on-chip ISP Flash permits field reprogramming, and JTAG-based debugging is available in family-compatible tools. Typical applications include utility meters, thermostats and HVAC controllers, battery-powered instruments with segment LCDs, and industrial control panels where an LCD driver plus ADC in one MCU saves board space and BOM cost. Design consideration: keep the system clock at or below 8 MHz as the V grade dictates, and verify brown-out and sleep-mode settings early because picoPower devices behave differently from P variants in deep-sleep current. This page synthesizes distributor pricing, drop-in alternatives, design notes, and FAQ content not found together on the manufacturer datasheet.

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ATMEGA3290V-8AUR - AVR 8-bit MCU 32KB Flash 8MHz | Microchip
ATMEGA3290V-8AUR

ATMEGA3290V-8AUR - AVR 8-bit MCU 32KB Flash 8MHz | Microchip

The Microchip Technology ATMEGA3290V-8AUR is a picoPower AVR 8-bit CMOS microcontroller with 32KB ISP Flash, 1KB EEPROM, 2KB SRAM, up to 8MHz clock, and 1.8V to 5.5V operation, housed in a 100-pin 14x14mm TQFP package. A microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and configurable peripherals into one chip. The AVR family popularized single-cycle RISC execution, and this ATmega device sits in the 8-bit MCU hierarchy under Microchip's broader embedded processor portfolio. It executes 131 powerful instructions, most in a single clock cycle, through its advanced RISC architecture with 32 general-purpose working registers. Key features include 32KB of in-system programmable (ISP) Flash with read-while-write capability, a 10-channel 10-bit ADC, an on-chip segment LCD controller that can drive up to 100 segments directly, two USARTs, and an 8MHz maximum clock frequency. The picoPower technology supports multiple sleep modes, and the device offers JTAG for boundary scan and on-chip debugging plus ISP and parallel programming options. Architecturally, the Harvard-design AVR core separates program and data buses, allowing simultaneous Flash access during execution. Hardware multiplier support and single-cycle I/O register access deliver up to 8 MIPS throughput at 8MHz. The wide 1.8V to 5.5V supply range lets a single PCB design target both 3.3V and 5V systems, though maximum clock speed scales with voltage. Typical applications include industrial control panels with built-in LCD displays, battery-powered instrumentation, consumer appliance interfaces, and building automation nodes where the integrated LCD driver removes the need for an external display controller. Design consideration: at 5V the device can run to its full 8MHz rating, but at 1.8V the safe maximum clock is much lower; consult the datasheet maximum frequency versus supply voltage curve before fixing your clock source and set AVR fuse bits accordingly. This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA329A-AU - 32KB AVR MCU, 20MHz, TQFP-64 | Microchip
ATMEGA329A-AU

ATMEGA329A-AU - 32KB AVR MCU, 20MHz, TQFP-64 | Microchip

The Microchip Technology ATMEGA329A-AU is an 8-bit AVR RISC microcontroller with 32 KB ISP Flash memory, 2 KB SRAM, 1 KB EEPROM, 54 general-purpose I/O lines, and an on-chip LCD controller with internal contrast control, packaged in a 64-pin TQFP (14x14 mm) for industrial-grade, green/RoHS applications. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, sitting within the broader hierarchy of embedded processors: microcontroller -> MCU -> embedded processor. The AVR ATmega family is widely used for cost-sensitive, low-power embedded control where integrated Flash, EEPROM, and rich peripherals reduce external component count. Key features include a 20 MHz maximum clock frequency (up to 20 MIPS throughput at 20 MHz), 32 general-purpose working registers directly connected to the ALU, read-while-write Flash programming via ISP, and a JTAG interface supporting boundary-scan, on-chip debugging, and in-system programming. The integrated LCD controller with internal contrast control is the headline differentiator, driving segment or dot-matrix LCD glass directly without an external LCD driver. The core runs from 2.0 V to 5.5 V (per ATmega329A family operating ranges), and three flexible timers, a 10-bit ADC, and a USART round out the peripheral set. The AVR architecture keeps interrupt latency short and deterministic, valuable in real-time control loops and metering front ends. Typical applications include utility metering with local LCD displays, battery-powered handheld instruments, industrial control panels, and white-goods human-machine interfaces where the integrated LCD driver and 54 I/O lines eliminate a discrete LCD driver IC. Design consideration: at 20 MHz and 5.5 V the supply current is highest; use the power-reduction register to clock-gate unused peripherals and consider the ATMEGA329PA-AU (picoPower) if battery life below a few microamps is required in sleep. This page synthesizes distributor pricing, verified drop-in alternatives within the ATmega LCD family, and practical design notes not consolidated in the manufacturer datasheet.

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ATMEGA329A-AUR - AVR 8-bit MCU 32KB Flash 20MHz | Microchip
ATMEGA329A-AUR

ATMEGA329A-AUR - AVR 8-bit MCU 32KB Flash 20MHz | Microchip

The Microchip Technology ATMEGA329A-AUR is an 8-bit AVR ATmega microcontroller with 32KB (16K x 16) in-system programmable FLASH, 2KB SRAM, 1KB EEPROM, and a maximum clock speed of 20MHz, housed in a 64-pin TQFP (14x14 mm, 0.8 mm pitch) surface-mount package. An 8-bit microcontroller (MCU) is a self-contained computing IC that integrates a processor core, program memory, data memory, and peripherals such as timers, UARTs, and analog converters on a single chip. The ATmega family belongs to the AVR architecture line, positioned within the broader hierarchy of embedded microcontrollers used in consumer, industrial, and instrumentation systems. Key features of the ATMEGA329A-AUR include the advanced AVR RISC core executing 131 powerful instructions, most in a single clock cycle, delivering up to 20 MIPS throughput at 20MHz. The integrated LCD controller is the defining peripheral of this device, supporting up to 132 segment drivers for driving liquid-crystal displays directly. A built-in 10-bit ADC, multiple timers, and dual USART serial interfaces round out the peripheral set. Architecturally, the device uses a Harvard-architecture pipeline with separate program and data buses, allowing single-cycle instruction fetch and execution. The 32KB FLASH supports 10,000 program/erase cycles, the EEPROM supports 100,000 cycles, and in-system self-programming enables boot-loader-based field updates. The wide supply range of 1.8V to 5.5V accommodates both battery-operated and 5V industrial designs. Typical applications include battery-powered instruments with LCD displays, utility metering, hand-held controllers, industrial panel interfaces, and medical monitoring devices where a low-power MCU drives segmented glass directly. A key design consideration is clock-speed selection versus supply voltage: the full 20MHz rating applies at higher supply voltages, and designers should verify the frequency-voltage derating curve in the manufacturer datasheet before finalizing power architecture. This page synthesizes distributor availability, drop-in same-family alternatives, pricing context, and practical design notes not consolidated in the manufacturer datasheet. Pricing shown as of 2026-09-17.

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ATMEGA329A-MUR - 8-bit AVR MCU, 32KB Flash, 64-QFN | Microchip
ATMEGA329A-MUR

ATMEGA329A-MUR - 8-bit AVR MCU, 32KB Flash, 64-QFN | Microchip

The Microchip (Atmel) ATMEGA329A-MUR is an 8-bit AVR RISC microcontroller with 32KB of in-system programmable Flash, 2KB SRAM, and 1KB EEPROM, housed in a 64-pin QFN (9x9 mm) package with exposed pad and supplied on tape and reel. It operates from 4.5V to 5.5V, runs at up to 20 MHz, and provides 32 general-purpose I/O lines. The part carries the industrial-grade temperature rating and is designated lead-free / RoHS-compliant ("Green"). What is an AVR microcontroller? An AVR is a family of 8-bit RISC microcontrollers originally developed by Atmel (now part of Microchip Technology) that use a modified Harvard architecture with separate program and data buses. In the broader taxonomy, the ATmega329A sits within: microcontroller -> embedded MCU -> 8-bit MCU -> AVR ATmega family -> LCD-display ATmega subfamily (the "329" series integrates an on-chip LCD driver). MCUs of this class are widely used in low-power, deterministic, interrupt-driven embedded designs where ease of programming and a rich peripheral set outweigh the need for raw CPU throughput. Key features include 131 powerful instructions, mostly single-cycle execution (so 1 MIPS per MHz), 32 KB Flash organized as 16K x 16, 2 KB SRAM, and 1 KB on-chip EEPROM for non-volatile user data. On-chip peripherals include a segmented LCD driver, a 10-bit ADC, multiple timers/counters (8-bit and 16-bit), a USART, an SPI interface, and a TWI (I2C-compatible) bus. The device supports six software-selectable power-saving modes, with typical active current of a few mA at full speed and sub-microamp currents in Power-Down. Architecturally, the ATmega329A uses a pipelined RISC core with 32 general-purpose working registers directly connected to the ALU, eliminating the accumulator bottleneck common to older 8-bit designs. This, combined with the on-chip LCD controller, makes it a particularly good fit for character or segment LCD-based products (POS terminals, metering, medical instruments, white goods) where the system needs to drive a glass directly without an external LCD controller. Typical applications include battery-powered metering equipment with LCD readouts, handheld measurement instruments, white-goods and appliance user interfaces, point-of-sale terminals, low-end industrial HMIs, and sensor-conditioning front-ends. The on-chip segmented display driver is the primary differentiator over general-purpose ATmega parts that lack LCD support. When designing with this part, allocate the bottom-layer PCB ground plane directly under the exposed pad of the 64-QFN and stitch multiple thermal vias into it; the pad is the primary heat-dissipation path and the only reliable ground reference for the inner-row balls. Verify pinout against revision-specific documentation because the ATmega329 and ATmega329A silicon differ in signature and a small number of register behaviors. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA329P-20AN - 8-bit AVR MCU 32KB Flash 64-TQFP | Microchip
ATMEGA329P-20AN

ATMEGA329P-20AN - 8-bit AVR MCU 32KB Flash 64-TQFP | Microchip

The Microchip Technology (Atmel) ATMEGA329P-20AN is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture, delivering up to 20 MIPS throughput at 20 MHz while integrating 32 KB of in-system programmable Flash, 2 KB SRAM, and 1 KB EEPROM in a 64-pin TQFP (14x14 mm) package. Operating from a 2.7 V to 5.5 V supply and qualified for the -40C to +105C industrial temperature range, this device targets display-centric and human-machine interface (HMI) applications. An 8-bit AVR microcontroller (MCU) is a single-chip computer built around the AVR enhanced RISC architecture, an 8-bit register file architecture with single-cycle instruction execution and Harvard-style separate program/data buses. AVR MCUs sit within the broader category hierarchy of microcontrollers -> embedded processors -> semiconductors. The ATmega329P specifically targets LCD-rich applications, integrating an LCD controller and supporting peripherals including SPI, UART/USART, and USI communication interfaces. Key differentiating features include 131 powerful instructions (most single-clock cycle execution), 32 x 8 general purpose working registers, fully static operation, an integrated LCD driver, 4 flexible timer/counters with compare modes, internal calibrated oscillator, and 6 software-selectable power-saving modes. The PicoPower technology provides ultra-low power consumption suitable for battery-backed applications. Technical depth: The device uses a Harvard architecture with two-stage pipelining and supports in-system programming via SPI interface. Hardware multipliers are not included (typical for 8-bit AVR), but the 20 MHz clock with single-cycle instruction fetch achieves 20 MIPS, comparable to other mid-range ATmega parts. The integrated LCD controller supports up to 4x25 segments directly without external driver ICs. Typical applications include metering and measurement equipment, portable medical devices, industrial control panels with LCD displays, consumer electronics with graphical user interfaces, automotive instrument clusters, and battery-powered data loggers. The wide 2.7V-5.5V input range enables direct operation from single-cell Li-ion or 3V coin cell batteries. When designing with this part, allocate sufficient PCB area for the TQFP-64 footprint (14x14 mm with 0.8 mm pitch) and use the LCD segment pins as documented in the datasheet segment mapping tables. The internal 8 MHz RC oscillator can replace an external crystal in cost-sensitive designs. This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes for the ATMEGA329P-20AN, complementing the manufacturer datasheet with structured data not found on a single OEM page.

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ATMEGA329P-20ANR - 8-bit AVR MCU 32KB Flash 20MHz 64-TQFP | Microchip
ATMEGA329P-20ANR

ATMEGA329P-20ANR - 8-bit AVR MCU 32KB Flash 20MHz 64-TQFP | Microchip

The Microchip ATMEGA329P-20ANR is a high-performance, low-power 8-bit AVR RISC-based microcontroller with 32 KB of in-system programmable Flash, 2 KB SRAM and 1 KB EEPROM, packaged in a 64-pin TQFP (14x14 mm). Operating at up to 20 MHz with a 16 MIPS throughput, it provides 54 general-purpose I/O lines, 32 general-purpose working registers and a rich peripheral set including ADC, timers, USART, SPI, TWI and JTAG. An 8-bit AVR microcontroller (AVR MCU) is a RISC-based Harvard-architecture CMOS device optimised for deterministic single-cycle instruction execution. The ATMEGA329P belongs to the megaAVR family and sits inside the broader 8-bit microcontroller -> microcontroller IC -> integrated circuit hierarchy. The picoPower technology used in this family allows active and sleep current to drop dramatically, making the part suitable for line-powered or battery-backed industrial designs that must wake on interrupt. Key features include 32 KB Flash with read-while-write capability, 1 KB EEPROM with 100k erase/write endurance, 2 KB SRAM, JTAG debug interface, two 8-bit timer/counters, one 16-bit timer/counter, 8-channel 10-bit ADC, programmable USART, master/slave SPI, TWI (I2C-compatible), internal calibrated RC oscillator, and six software-selectable power-saving modes. The part operates from 1.8 V to 5.5 V across -40 C to +105 C industrial temperature. The architecture combines an advanced RISC core (131 instructions, most single-cycle) with a non-volatile memory subsystem and event system peripherals. The 64-pin TQFP provides enough I/O for human-machine interfaces, LCD control and parallel bus peripherals, while the 32 KB Flash is sufficient for USB HID class stacks, Modbus RTU slaves and graphical LCD drivers. Typical applications include industrial control panels, white goods and HVAC user interfaces, metering and sensor front-ends, battery-powered data loggers, USB HID peripherals and small graphics LCD controllers. The wide 1.8-5.5 V supply range allows direct connection to a single Li-ion cell or a regulated 3.3 V / 5 V rail. When designing with this device, allocate the ICSP/SPD signals on dedicated PCB test points so production programmers can reach the chip without removing surrounding passives. Decouple VCC with a 100 nF ceramic close to each power pin and add a bulk 10 uF at the supply input. This page synthesises distributor pricing, drop-in alternatives, and design notes that go beyond the manufacturer datasheet to help engineers choose and source the part quickly.

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ATMEGA329P-20AU - 20MHz 8-bit AVR MCU 32KB Flash TQFP-64
ATMEGA329P-20AU

ATMEGA329P-20AU - 20MHz 8-bit AVR MCU 32KB Flash TQFP-64

The Microchip Technology ATMEGA329P-20AU is a high-performance, low-power 8-bit AVR RISC-based microcontroller combining 32 KB of in-system programmable Flash with read-while-write capability, 1 KB EEPROM, and 2 KB SRAM, operating at up to 20 MHz in a 64-pin TQFP (14x14 mm) package. An 8-bit AVR microcontroller is a Harvard-architecture MCU from Microchip's classic megaAVR family that executes one instruction per clock cycle, achieving throughputs approaching 1 MIPS per MHz. The megaAVR series sits within Microchip's broader 8-bit MCU portfolio (tinyAVR -> megaAVR -> XMEGA), serving as the mainstream workhorse for embedded control where deterministic real-time behavior, rich I/O, and ISP-based field upgradeability matter more than raw clock speed. Key differentiating features include 54 general-purpose I/O lines, 32 general-purpose working registers, 131 powerful instructions (mostly single-cycle), a JTAG interface for on-chip debug, six PWM channels, a 10-bit ADC with up to 8 single-ended channels, two USARTs, a TWI (I2C) peripheral, and an SPI interface. The device supports an industrial operating temperature range of -40C to +85C and a supply voltage range of 2.7 V to 5.5 V at 10 MHz (4.5 V to 5.5 V required for the full 20 MHz operation indicated by the -20 speed grade). Architecturally, the ATmega329P uses Microchip's picoPower technology with multiple sleep modes (Idle, ADC Noise Reduction, Power-save, Power-down, Standby, Extended Standby) and an advanced brown-out detector. The integrated QTouch library support enables capacitive touch sensing on any GPIO without external components, making it a popular choice for human-machine interface panels. Typical applications include industrial control panels, LCD-display-driven HMI modules, white goods and appliance controllers, automotive body electronics (non-safety), USB device firmware using external PHY, and AVR-based data acquisition systems. The combination of substantial Flash, ample I/O, and built-in LCD-like peripheral support also makes it a common choice for educational development boards and OEM prototyping kits. Designers should select the appropriate fuse configuration for clock source (internal 8 MHz RC vs external crystal) and verify the JTAG vs ISP pin usage does not conflict with application I/O assignments. The device uses standard SPI for ISP programming, allowing field firmware updates via a 6-pin header. This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design notes - including comparison against the ATMEGA325P-20AU, ATMEGA3290P-20AU, and ATMEGA328P-AU family members - not found in the manufacturer datasheet alone.

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ATMEGA329P-20MN - 20MHz 32KB Flash AVR MCU 64-QFN | Microchip
ATMEGA329P-20MN

ATMEGA329P-20MN - 20MHz 32KB Flash AVR MCU 64-QFN | Microchip

The Microchip ATMEGA329P-20MN is an 8-bit AVR RISC-based picoPower microcontroller with 32 KB ISP Flash, 2 KB SRAM, and 1 KB EEPROM, operating at up to 20 MHz in a 64-pin QFN (9x9 mm) package. It combines a high-performance 8-bit CPU executing 131 powerful instructions (most in a single clock cycle) with up to 16 MIPS throughput at 20 MHz, alongside 32 general-purpose working registers and full static operation. What is an 8-bit AVR microcontroller? It is a RISC (Reduced Instruction Set Computer) microcontroller based on the Harvard architecture developed by Atmel (now Microchip). The AVR family occupies the '8-bit MCU' tier of the broader microcontroller hierarchy: microcontroller -> embedded MCU -> 8-bit MCU -> AVR RISC MCU -> picoPower family. ATmega devices are positioned at the upper end of the 8-bit AVR range, distinguished by large integrated Flash, SRAM, EEPROM, and rich peripheral sets. Key features include 54 general-purpose I/O lines, a JTAG interface for on-chip debug, four flexible timer/counters with compare and PWM modes, a 10-bit ADC with up to 8 channels, an LCD controller supporting up to 4x25 segments, and two USART plus one TWI (I2C) and one SPI serial interface. The device operates from 2.7V to 5.5V and supports industrial temperature grades to 105 C. The ATMEGA329P-20MN leverages the picoPower technology for ultra-low power consumption, with multiple sleep modes (idle, power-down, power-save, standby, extended standby) drawing microampere-level currents. This makes it suitable for battery-powered applications where runtime directly depends on MCU efficiency. The 64-QFN (9x9 mm) package provides good thermal performance and a compact footprint for space-constrained designs. Typical applications include industrial control panels with integrated LCDs, consumer appliances with graphical displays, sensor hubs with LCD readouts, low-power handheld instrumentation, and embedded human-machine interface (HMI) modules. The combination of an LCD controller and large Flash/SRAM makes it a single-chip solution for graphical HMI nodes. When designing with this device, ensure decoupling capacitors are placed as close as possible to VCC pins and that the JTAG pins are reserved for debugging access. The LCD voltage generation and segment allocation require careful board layout to avoid ghosting. Always validate low-power claims with a current profile measurement, not just datasheet typ numbers. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical engineering design notes not found in the manufacturer datasheet alone.

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ATMEGA329P-20MU - 8-bit AVR MCU, 32KB Flash, 20MHz | Microchip
ATMEGA329P-20MU

ATMEGA329P-20MU - 8-bit AVR MCU, 32KB Flash, 20MHz | Microchip

The Microchip (formerly Atmel) ATMEGA329P-20MU is a high-performance, picoPower 8-bit AVR RISC-based microcontroller featuring 32KB of in-system programmable Flash, 2KB SRAM, and 1KB EEPROM, housed in a 64-pin QFN (MLF) 9x9mm package with an exposed thermal pad. It operates at up to 20MHz across a 2.7V to 5.5V supply range and provides 54 general-purpose I/O lines organized across multiple ports, plus a JTAG interface for on-chip debug and boundary-scan. The device is targeted at industrial and consumer embedded designs that require on-board LCD driving capability combined with low active and sleep power consumption. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data memory, I/O peripherals, and timers onto one die, executing instructions fetched from on-chip Flash. Within the broader taxonomy, the ATMEGA329P belongs to the AVR family of RISC microcontrollers, itself a subset of the picoPower low-power MCU category, which sits under the embedded computing / power-managed semiconductor hierarchy. The AVR core uses a Harvard-style architecture with separate program and data buses and a large register file of 32 general-purpose working registers directly tied to the ALU, enabling most instructions to complete in a single clock cycle. Key features that differentiate the ATMEGA329P-20MU include 131 powerful instructions (most single-cycle execution), a hardware multiplier, two 8-bit timer/counters plus two 16-bit timer/counters with PWM, 8-channel 10-bit ADC, a USART, SPI and TWI (I2C-compatible) peripherals, an integrated LCD controller capable of driving segment displays up to 4 common and 32 segment lines, and a 4-channel PWM with programmable dead-time generators. Six sleep modes (Idle, Power-down, Power-save, Standby, Extended Standby, and ADC Noise Reduction) plus the picoPower 0.1uA real-time-clock operation make it attractive for battery-backed applications. Architecturally, the ATMEGA329P-20MU adds the 'P' picoPower enhancements on top of the legacy ATmega329 die, lowering active current and supporting ultra-low-power RTC backup. The QFN-64 (MLF) package with exposed pad gives a low theta-JA for thermal dissipation and a small PCB footprint. It is pin-compatible with the ATmega169/329 family and shares the same peripheral mix for migration paths. Typical applications include industrial control panels with integrated LCD segment displays, battery-powered metering and instrumentation, white-goods HMI, e-bike dashboards, medical handheld terminals, and remote sensor readout heads. The combination of LCD controller and picoPower sleep modes suits mains-line or battery-driven user-interface products. For designs requiring graphical TFT instead of segment LCD, consider the ATmega3290P or an external display controller. When designing with this part, observe that '20MU' denotes the 20MHz speed grade at 5V operation; at lower Vcc the maximum clock must be derated per the datasheet DC characteristics. Place decoupling capacitors as close as possible to each VCC/GND pair and ensure the exposed pad is soldered to a sufficient ground copper pour for both thermal and electrical performance. This page synthesizes distributor pricing as of 2026-09-17, drop-in same-package alternatives drawn from the same ATmega329/325 QFN-64 family, and practical design notes not aggregated on any single distributor product page.

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