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HomeProductsIntegrated Circuits (ICs)Embedded - MicrocontrollersATMEGA1284P-AU
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ATMEGA1284P-AU - Microchip Technology

Manufacturer Part Number
ATMEGA1284P-AU
Manufacturer
Microchip Technology
Allelco Part Number
32D-ATMEGA1284P-AU
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
6,759 pcs available, New & Original
Parts Description
IC MCU 8BIT 128KB FLASH 44TQFP
Package
44-TQFP (10x10)
Data sheet
ATMEGA1284P-AU.pdf

PCN Assembly/Origin

Fab Site 28/Jan/2021.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 6759
  • Unit Price: $4.352
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $4.352 $4.35
10+ $3.831 $38.31
30+ $3.515 $105.45
100+ $3.248 $324.80
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

ATMEGA1284P-AU Tech Specifications
Microchip Technology - ATMEGA1284P-AU technical specifications, attributes, parameters and parts with similar specifications to Microchip Technology - ATMEGA1284P-AU

Product Attribute Attribute Value
Manufacturer Microchip Technology
Voltage - Supply (Vcc/Vdd) 1.8V ~ 5.5V
Supplier Device Package 44-TQFP (10x10)
Speed 20MHz
Series AVR® ATmega
RAM Size 16K x 8
Program Memory Type FLASH
Program Memory Size 128KB (64K x 16)
Peripherals Brown-out Detect/Reset, POR, PWM, WDT
Package / Case 44-TQFP
Package Tray
Product Attribute Attribute Value
Oscillator Type Internal
Operating Temperature -40°C ~ 85°C (TA)
Number of I/O 32
Mounting Type Surface Mount
EEPROM Size 4K x 8
Data Converters A/D 8x10b
Core Size 8-Bit
Core Processor AVR
Connectivity I²C, SPI, UART/USART
Base Product Number ATMEGA1284

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.31.0001

Parts Introduction

ATMEGA1284P-AU Image
ATMEGA1284P-AU (1)

Manufacturer Part Number

ATMEGA1284P-AU

Manufacturer

Microchip Technology

Introduction

High-performance, low-power Atmel AVR 8-bit microcontroller

ATMEGA1284P-AU Image
ATMEGA1284P-AU (2)

Product Features and Performance

8-bit AVR core

Up to 20MHz operating speed

32 programmable I/O lines

128KB in-system self-programmable flash

4KB EEPROM

16KB SRAM

In-circuit debugging support

Product Advantages

Large memory capacity in its class

Extensive I/O options with 32 programmable pins

Supports high-speed SPI for data transfer

Versatile power management options

Robust PWM and timer/counters

Key Technical Parameters

Core Size: 8-Bit

Speed: 20MHz

Connectivity: I2C, SPI, UART/USART

Program Memory Size: 128KB flash

EEPROM Size: 4KB

RAM Size: 16KB

Voltage Supply: 1.8V to 5.5V

Data Converters: 8-channel, 10-bit A/D

Operating Temperature: -40°C to 85°C

Quality and Safety Features

Brown-out detect and reset

Programmable watch-dog timer with internal oscillator

Power-on reset circuit

ATMEGA1284P-AU Image
ATMEGA1284P-AU (3)

Compatibility

Supports interfacing with I2C, SPI, and UART/USART devices

44-TQFP surface mount package for compatibility with standard PCB assembly

Application Areas

Consumer electronics

Industrial automation

Automotive applications

Internet of Things (IoT) devices

Product Lifecycle

Status: Active

Continuously supported with potential for next-generation upgrades

Several Key Reasons to Choose This Product

Advanced RISC architecture for efficient processing

Improves system reliability with integrated safety features

Flexible and power-efficient design suitable for battery-operated systems

Wide operating voltage and temperature range to suit various environments

Extensive memory and connectivity features add value for complex applications

Frequently Asked Questions(FAQ)

What are the key performance trade-offs when selecting the ATMEGA1284P-AU for a low-power embedded application, and how does its voltage range influence system design?
The ATMEGA1284P-AU operates across a wide supply voltage range of 1.8V to 5.5V, enabling flexible power budgeting in battery-powered systems. However, reducing Vcc below 3.0V typically decreases the maximum clock speed from 20MHz to 10MHz due to timing constraints in internal oscillator calibration and I/O drive strength. While this supports ultra-low-power modes like Power-down with 0.1 µA consumption, designers must balance processing throughput against energy efficiency. For instance, using the internal RC oscillator at 32kHz during sleep allows minimal current draw but limits wake-up response time. The presence of brown-out detection and programmable voltage thresholds adds robustness but requires careful configuration to avoid unintended resets during voltage sags.
How does the memory architecture of the ATMEGA1284P-AU compare to earlier AVR models like the ATmega2560, particularly in terms of code density and data access patterns?
With 128KB of in-system programmable FLASH, 16KB of SRAM, and 4KB of EEPROM, the ATMEGA1284P-AU offers a more compact footprint than the ATmega2560 (256KB Flash, 8KB RAM) but less headroom for complex applications. Its Harvard architecture separates instruction and data buses, supporting single-cycle execution of most instructions—critical for real-time control tasks. Unlike the ATmega2560, it lacks on-chip XRAM, limiting external memory expansion. This makes it better suited for deterministic, interrupt-driven designs where code size is constrained. For example, a motor control algorithm requiring <10KB of code fits efficiently, while dynamic data structures exceeding 16KB may require off-chip buffering or compression.
In what scenarios would the ATMEGA1284P-AU be preferable over the ATMEGA328P-AU despite its higher pin count and cost?
The ATMEGA1284P-AU is ideal when more program memory, peripherals, or GPIO are needed without transitioning to ARM-based MCUs. For instance, in industrial sensor networks requiring multiple analog inputs, UARTs, and hardware PWM, its eight-channel 10-bit ADC, dual USART modules, and 32 I/O pins provide native support absent in the ATmega328P. It also includes advanced features like auto-calibration for the internal oscillator, which reduces BOM cost in precision timing applications. While the ATmega328P suffices for basic Arduino-style projects, the ATMEGA1284P-AU handles multi-protocol communication stacks and state machines that would otherwise require external logic.
What considerations apply when implementing reliable firmware updates using the ATMEGA1284P-AU’s bootloader functionality?
The ATMEGA1284P-AU supports standard AVR ISP bootloaders that leverage the SPI interface for in-application programming. Designers must allocate a dedicated boot section within the 128KB FLASH—typically 8KB or larger—to store the bootloader, leaving sufficient space for the main application. During update operations, the bootloader disables interrupts and verifies write integrity via checksum validation before committing changes. Failure to implement proper stack pointer initialization or flash erase/write sequencing can brick the device. Additionally, operating above 5.5V during programming may violate absolute maximum ratings, so regulated power supplies with overvoltage protection are recommended.
How does the internal oscillator accuracy of the ATMEGA1284P-AU impact timing-critical applications such as UART baud rate generation?
The factory-calibrated internal oscillator provides ±1% accuracy over temperature and voltage, sufficient for standard UART baud rates up to 115200 bps at 8MHz. However, precise timing—such as 1ms intervals or synchronous serial protocols—requires periodic re-calibration using external crystal references or software compensation. At 20MHz operation, even minor frequency drift causes cumulative errors; for example, a 1% deviation results in a 10μs error every millisecond. In such cases, switching to a 16MHz crystal oscillator improves stability or implementing watchdog-based correction loops becomes necessary.
Can the ATMEGA1284P-AU directly drive capacitive loads typical in LCD displays, and what circuit modifications might be required?
No, the ATMEGA1284P-AU’s GPIO pins lack sufficient drive current (>20mA per pin) for direct driving multiplexed LCD segments. Attempting this risks exceeding maximum ratings and corrupting internal latches. Instead, external drivers such as MAX7219 or dedicated LCD controllers interfaced via SPI are used. Alternatively, open-drain configuration with pull-ups and discrete transistors can enable moderate capacitive loads, though this increases component count and power consumption. For small character displays (<16 digits), a simpler solution involves shift registers like 74HC595 to buffer outputs and reduce MCU load.
What are the thermal implications of sustained 20MHz operation on the ATMEGA1284P-AU in sealed enclosures?
Running continuously at 20MHz with all peripherals active draws approximately 15–20 mA at 3.3V, generating ~50–70 mW of heat. In poorly ventilated enclosures, junction temperatures can exceed 85°C, triggering thermal shutdown if ambient exceeds 60°C. While the device tolerates up to 85°C, prolonged exposure accelerates electromigration and reduces reliability. To mitigate, reduce clock frequency, disable unused modules, or add thermal vias under the TQFP package. Passive cooling with copper planes or active fans may be necessary in high-duty-cycle applications like data loggers or wireless gateways.
How should the ATMEGA1284P-AU’s watchdog timer be configured to prevent false resets during transient noise conditions?
The independent watchdog timer (WDT) must be enabled with a conservative timeout period—typically 2–4 seconds—and fed regularly by software to avoid unintended resets. During noisy environments, adding a small ceramic capacitor (100nF) between RESET pin and GND filters glitches, while decoupling Vcc aggressively suppresses supply transients. Avoid enabling WDT during critical sections without disabling it temporarily. Note that WDT reset does not clear RAM, unlike power-on reset, so state preservation logic must be implemented if recovery is required post-reset.
What limitations exist when interfacing the ATMEGA1284P-AU with I²C devices running at 400kHz or higher?
Although the ATMEGA1284P-AU supports Fast Mode I²C up to 400kHz, achieving stable communication depends on pull-up resistor values and bus capacitance. Exceeding 400pF total capacitance without strengthening pull-ups (>4.7kΩ) causes rise-time violations. Additionally, internal Schmitt triggers have limited hysteresis, making signal integrity sensitive to PCB layout parasitics. For 1MHz operation, external I²C buffers or switching to SPI is advisable. Always verify timing margins using oscilloscope measurements rather than relying solely on datasheet specifications.
Is it feasible to use the ATMEGA1284P-AU as an emulator for debugging other AVR microcontrollers, and what hardware/software setup is required?
Yes, the ATMEGA1284P-AU can function as an AVRISP mkII clone using open-source tools like AVRDUDE and custom firmware. It requires reprogramming with a precompiled bootloader image via JTAGICE3 or parallel programmer. The SPI interface must be exposed externally, and clock polarity/phase aligned with target devices. Limitations include lack of hardware breakpoints, necessitating software stepping through code. This approach is useful for prototyping debug environments but not suitable for production-level emulation due to performance overhead and limited feature set compared to dedicated emulators.
How does the EEPROM endurance of the ATMEGA1284P-AU compare to flash memory in write-intensive logging applications?
The ATMEGA1284P-AU’s EEPROM has a rated endurance of 100,000 write cycles per byte, significantly lower than FLASH’s 10,000 cycles. In data-logging scenarios writing once per second, EEPROM lasts decades, but aggressive logging (e.g., 10 writes/sec) degrades it within years. To extend life, implement wear leveling by distributing writes across multiple EEPROM addresses or buffer data in RAM before bulk-erasing. FLASH, while slower to erase (4ms vs 3.6ms for EEPROM), remains viable for infrequent firmware updates only. Thus, EEPROM is preferred for configuration storage, not high-frequency logging.
What precautions are essential when soldering the ATMEGA1284P-AU in a mass-production environment to ensure long-term reliability?
As an MSL3 device requiring handling after 168 hours of storage, the ATMEGA1284P-AU demands strict moisture control. Bake parts before reflow if shelf life exceeds 168 hours, following IPC-J-STD-033 guidelines. Use nitrogen reflow profiles to minimize voiding, and inspect solder joints via X-ray for TQFP fine-pitch alignment. Thermal cycling tests reveal potential delamination at corners if pad metallurgy mismatches. Finally, conformal coating should avoid contact with exposed bond wires—apply selectively using automated dispensing to preserve electrical performance.
How can the ATMEGA1284P-AU’s ADC be calibrated for improved linearity in precision measurement circuits?
The ATMEGA1284P-AU’s ADC exhibits non-linearity up to ±2 LSB under ideal conditions. Calibration involves measuring known reference voltages (e.g., 1.1V internal bandgap) and adjusting offset/gain coefficients in firmware. Implement two-point calibration: read at Vref/2 and full scale, then apply linear interpolation. Store correction factors in EEPROM and reload on startup. External precision resistors and guarding techniques further enhance accuracy. Without calibration, INL can degrade to ±5 LSB, making it unsuitable for medical or scientific instrumentation requiring >12-bit effective resolution.
What role does the power-on reset (POR) circuit play in the ATMEGA1284P-AU’s startup sequence, and when might external POR circuitry be necessary?
The integrated POR ensures stable initialization by holding the chip in reset until Vcc reaches ~1.5V. Below this threshold, core logic remains inactive, preventing undefined states. However, fast-rising power rails or inductive kickback in industrial settings may cause brief dips below POR threshold, leading to erratic behavior. Adding an external supervisor IC like MCP1700 with reset delay extends glitch immunity. Also, capacitive loads drawing >100mA during startup may prolong POR duration, delaying application availability—consider soft-start circuits in such cases.
How does the ATMEGA1284P-AU handle simultaneous peripheral usage, such as SPI communication while servicing ADC conversions?
The ATMEGA1284P-AU supports concurrent peripheral operation through independent interrupt vectors and DMA-like transfer mechanisms. SPI transmissions can occur during ADC sampling without CPU intervention, thanks to separate status flags and FIFO buffers in hardware. However, shared resources like the system clock or I/O pins require careful arbitration. For example, enabling SPI interrupts while ADC completes conversions may cause race conditions if buffers overlap. Properly designed ISRs with atomic operations ensure data coherence, though worst-case latency increases by ~50μs due to context switching overhead.
What are the legal and compliance considerations when sourcing the ATMEGA1284P-AU for commercial products in North America and Europe?
The ATMEGA1284P-AU complies with RoHS3 and REACH regulations, eliminating lead, mercury, and restricted substances. Its ECCN classification (EAR99) indicates no export restrictions under U.S. regulations, simplifying global distribution. HTSUS code 8542.31.0001 applies for customs clearance in the U.S., while CE marking requires conformity to EMC and LVD directives if integrated into end-equipment. End-users must conduct final certification testing, as Microchip’s compliance covers only the component level, not complete assemblies.
When upgrading legacy systems based on older AVR models, what migration challenges arise when adopting the ATMEGA1284P-AU?
Porting code from devices like ATmega168 or ATmega32 often reveals differences in register layouts and peripheral behaviors. For instance, timer/counter modes vary slightly, and USART frame formats differ in parity handling. Interrupt vector tables must be re-mapped, and linker scripts adjusted for 128KB FLASH addressing. Additionally, bootloader compatibility issues may require updating fuse bits or using universal programmers. Thorough regression testing is essential, especially for safety-critical systems where timing guarantees depend on exact cycle counts—subtle clock source changes can invalidate existing logic.

Parts with Similar Specifications

The three parts on the right have similar specifications to Microchip Technology ATMEGA1284P-AU

Product Attribute ATMEGA1284P-AUR ATMEGA1284P-MU ATMEGA1284P-MUR ATMEGA1284P-PU
Part Number ATMEGA1284P-AUR ATMEGA1284P-MU ATMEGA1284P-MUR ATMEGA1284P-PU
Manufacturer Microchip Technology Atmel Microchip Technology Microchip Technology
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Connectivity - - - -
Core Size - - - -
RAM Size - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Peripherals - - - -
Data Converters - - - -
Speed - - - -
Core Processor - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Program Memory Size - - - -
Series - - - -
Number of I/O - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
EEPROM Size - - - -
Oscillator Type - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Program Memory Type - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Voltage - Supply (Vcc/Vdd) - - - -

ATMEGA1284P-AU Datasheet PDF

Download ATMEGA1284P-AU pdf datasheets and Microchip Technology documentation for ATMEGA1284P-AU - Microchip Technology.

Datasheets
ATmega164A/PA/324A/PA/644A/PA/1284/P.pdf
PCN Design/Specification
ATMEGA Datasheet 11/Dec/2018.pdf ATmega164A/PA/324A/PA/644A/PA/1284/P 20/Jan/2020.pdf
PCN Packaging
Boxes 07/Dec/2016.pdf MBB/Label Chgs 16/Nov/2018.pdf
PCN Assembly/Origin
Fab Site 28/Jan/2021.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

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Brazil 7
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New Zealand 5
Asia India 4
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DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
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Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
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Electrostatic Discharge Protection and Handling

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ATMEGA1284P-AU Image

ATMEGA1284P-AU

Microchip Technology
32D-ATMEGA1284P-AU

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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