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HomeProductsIntegrated Circuits (ICs)Embedded - MicrocontrollersATMEGA8515L-8JU
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ATMEGA8515L-8JU - Atmel

Manufacturer Part Number
ATMEGA8515L-8JU
Manufacturer
Atmel
Allelco Part Number
32D-ATMEGA8515L-8JU
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
13,530 pcs available, New & Original
Parts Description
IC MCU 8BIT 8KB FLASH 44PLCC
Package
44-PLCC (16.6x16.6)
Data sheet
-
RoHs Status
 
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In stock: 13530
  • Unit Price: $5.141
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $5.141 $5.14
10+ $4.909 $49.09
30+ $4.769 $143.07
100+ $4.651 $465.10
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

ATMEGA8515L-8JU Tech Specifications
Atmel - ATMEGA8515L-8JU technical specifications, attributes, parameters and parts with similar specifications to Atmel - ATMEGA8515L-8JU

Product Attribute Attribute Value
Manufacturer Atmel
Voltage - Supply (Vcc/Vdd) 2.7V ~ 5.5V
Supplier Device Package 44-PLCC (16.6x16.6)
Speed 8MHz
Series AVR® ATmega
RAM Size 512 x 8
Program Memory Type FLASH
Program Memory Size 8KB (4K x 16)
Peripherals Brown-out Detect/Reset, POR, PWM, WDT
Package / Case 44-LCC (J-Lead)
Package Bulk
Product Attribute Attribute Value
Oscillator Type Internal
Operating Temperature -40°C ~ 85°C (TA)
Number of I/O 35
Mounting Type Surface Mount
EEPROM Size 512 x 8
Data Converters -
Core Size 8-Bit
Core Processor AVR
Connectivity EBI/EMI, SPI, UART/USART
Base Product Number ATMEGA8515

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
ECCN EAR99
HTSUS 8542.31.0001

Frequently Asked Questions(FAQ)

How does the ATMEGA8515L-8JU handle brown-out detection at different supply voltages, and what design precautions should be taken when operating near its minimum Vcc threshold?
The ATMEGA8515L-8JU includes an internal brown-out detection (BOD) circuit that monitors the supply voltage to prevent erratic behavior during undervoltage conditions. This feature is particularly critical when operating near the 2.7V minimum supply voltage, as microcontroller instability or unintended resets can occur below the BOD trip point. Engineers designing systems with variable power sources—such as battery-powered applications—should ensure adequate voltage regulation and include filtering capacitors close to the Vcc pin to suppress transients. Additionally, firmware must account for potential brown-out reset events by implementing state preservation or safe startup routines, especially in embedded control tasks where data integrity is essential.
What are the key differences between using the internal oscillator versus an external crystal on the ATMEGA8515L-8JU, particularly in terms of accuracy and power consumption?
The ATMEGA8515L-8JU supports both an internal calibrated RC oscillator running at 8MHz and external crystal/ceramic resonator options. The internal oscillator offers convenience and lower component count but has a typical frequency tolerance of ±10% across temperature and voltage variations, making it suitable for non-time-critical applications. In contrast, an external crystal provides superior stability (±20 ppm or better), which is essential for communication protocols like UART or SPI requiring precise baud rate generation. However, using an external oscillator increases PCB complexity and power consumption slightly due to additional loading and drive circuitry. For most low-cost, low-power designs where timing precision is moderate, the internal oscillator suffices, but mission-critical systems benefit from the enhanced accuracy of an external source.
Can the ATMEGA8515L-8JU be used in automotive environments, and what modifications might be necessary to meet stricter temperature requirements beyond its standard -40°C to 85°C range?
While the ATMEGA8515L-8JU operates reliably within -40°C to 85°C and meets industrial-grade specifications, it is not qualified for full automotive AEC-Q100 compliance out of the box. Automotive applications often require extended temperature ranges up to 125°C or higher, along with rigorous reliability testing such as thermal cycling, humidity resistance, and electromagnetic compatibility validation. To adapt this MCU for automotive use, engineers would need to select a similar device from Microchip’s automotive portfolio (e.g., ATmega series with AEC-Q100 certification) or implement additional environmental protection measures including conformal coating, robust PCB layout, and derating of electrical parameters. Simply substituting the ATMEGA8515L-8JU without qualification poses significant risk in safety-critical vehicle systems.
How does the 44-PLCC package of the ATMEGA8515L-8JU affect high-frequency signal routing, and what layout considerations are recommended to minimize EMI and crosstalk?
The 44-PLCC (16.6x16.6 mm) package features gull-wing leads that extend outward from the body, offering good mechanical stability but presenting challenges for high-speed signal integrity compared to QFP packages with shorter leads. On PCBs, the longer lead lengths increase parasitic inductance and capacitance, potentially degrading performance on fast I/O lines such as SPI or clock outputs. To mitigate these effects, designers should keep high-speed traces short, avoid parallel routing adjacent to sensitive analog lines, and place decoupling capacitors as close as possible to the Vcc and AVcc pins. Ground planes under the IC and careful layer stackup in multilayer boards further reduce electromagnetic interference. Given the ATMEGA8515L-8JU’s 8MHz maximum operating speed, many standard EMC practices apply, but vigilance is still required during layout to ensure reliable operation in electrically noisy environments.
What is the maximum number of simultaneous PWM channels available on the ATMEGA8515L-8JU, and how do duty cycle resolution limits impact motor control or LED dimming applications?
The ATMEGA8515L-8JU provides six PWM channels via its Timer/Counter modules: two 8-bit timers (Timer0 and Timer2) and one 16-bit timer (Timer1). Each channel offers variable resolution depending on prescaler settings. The 8-bit timers support 8-bit resolution (0–255), while the 16-bit timer enables finer control up to 16 bits (0–65535). For applications like DC motor speed regulation or RGB LED brightness control, this allows smooth modulation with minimal flicker. However, achieving sub-1% duty cycle granularity requires careful configuration of the 16-bit timer and may necessitate software interpolation if higher precision is needed. Realistically, most consumer-level lighting or actuator control tasks perform adequately within the hardware limits, but high-resolution servo positioning might require external DACs or dedicated PWM controllers alongside the ATMEGA8515L-8JU.
When interfacing the ATMEGA8515L-8JU with external memory via EBI/EMI, what address/data bus width configurations are supported, and how does this constrain system scalability?
The ATMEGA8515L-8JU supports asynchronous external bus interface (EBI) operations allowing connection to SRAM, ROM, or other peripherals. It can operate in 8-bit or 16-bit data bus modes, determined by the EA/VPP pin configuration. In 8-bit mode, only the lower byte of 16-bit addresses is used, effectively halving the accessible memory space compared to 16-bit addressing. This limitation affects systems requiring large contiguous memory blocks, such as data logging or image buffering. Designers must therefore either accept reduced addressable space or implement bank-switching logic in firmware. Additionally, timing constraints imposed by the 8MHz clock limit access cycles; for instance, wait states may be required when driving slower memory devices. These factors make the ATMEGA8515L-8JU suitable for modest external memory needs but impractical for high-bandwidth or large-capacity storage expansion without auxiliary controllers.
How does the EEPROM size of 512 x 8 bytes on the ATMEGA8515L-8JU influence long-term data retention strategies in battery-backed systems?
With only 512 bytes of on-chip EEPROM, the ATMEGA8515L-8JU imposes strict constraints on non-volatile data storage capacity. Each byte can endure approximately 100,000 write cycles under normal conditions, so frequent updates to calibration values, user preferences, or counters could degrade reliability over time. In battery-backed systems, designers often rely on the EEPROM for storing critical parameters like sensor offsets or configuration flags. To mitigate wear, firmware should implement wear-leveling algorithms or batch writes to reduce cycle counts. Alternatively, external FRAM or battery-backed RAM modules can supplement EEPROM for larger datasets. Given the limited size, it's advisable to compress or aggregate data before storage and validate checksums post-write to detect corruption—especially important in unattended deployments where error recovery is difficult.
What role does the Watchdog Timer (WDT) play in preventing system lockups in the ATMEGA8515L-8JU, and how should its timeout period be selected based on application responsiveness requirements?
The ATMEGA8515L-8JU integrates a configurable Watchdog Timer (WDT) that resets the MCU if software fails to periodically clear it within a defined window. This prevents catastrophic hangs caused by infinite loops or dead code paths. The WDT supports timeout periods ranging from 16ms to 8 seconds in fixed increments, selectable via fuse bits. Choosing an appropriate timeout involves balancing fault detection speed against false-positive risks. For real-time control loops requiring sub-second response, shorter intervals (e.g., 100–500ms) enhance system recoverability but demand more frequent service calls in interrupt-heavy firmware. Conversely, slow-response applications (e.g., periodic sensor polling) may tolerate longer timeouts. Best practice includes enabling the WDT early in initialization, avoiding blocking operations during servicing, and ensuring all major tasks acknowledge watchdog health to maintain robustness in unattended environments.
How does the voltage range of 2.7V to 5.5V on the ATMEGA8515L-8JU enable compatibility with mixed-voltage systems, and what precautions are needed when connecting I/O pins to 5V logic levels?
Operating from 2.7V to 5.5V gives the ATMEGA8515L-8JU flexibility in interfacing with both low-voltage microcontrollers and traditional 5V peripherals. Its I/O pins are 5V-tolerant, meaning they can safely accept input signals up to Vcc + 0.5V without damage—even when powered down. This simplifies coexistence with legacy sensors, displays, or communication chips. However, bidirectional communication requires level-shifting when the target device runs at a different supply voltage. For unidirectional inputs into the ATMEGA8515L-8JU from 5V sources, direct connection is acceptable as long as Vcc exceeds 2.7V. Outputs driven toward 5V loads may exhibit reduced noise margins at the lower end of the supply range; thus, pull-up resistors or Schottky diodes can improve rise times and signal integrity. Always verify timing margins through simulation or prototyping, especially in high-impedance configurations.
In what scenarios would replacing the ATMEGA8515L-8JU with a newer AVR model like the ATmega328P provide tangible benefits, and which specific features justify such an upgrade?
Although both MCUs belong to Microchip’s AVR family, the ATmega328P offers several advantages over the ATMEGA8515L-8JU, including double the program memory (32KB vs. 8KB), larger RAM (2KB vs. 512B), and improved peripherals such as a built-in 16-bit timer with input capture and dual compare units. The ATmega328P also features a more advanced ADC with higher resolution (10-bit vs. 10-bit but better linearity) and optional differential input modes. These enhancements make it preferable for applications requiring expanded code space, dynamic data processing, or richer sensor interfaces. Additionally, the ATmega328P enjoys broader community support and toolchain optimization. However, if the existing design fits within the ATMEGA8515L-8JU’s constraints and leverages its unique pinout or legacy compatibility, migration may not be cost-effective unless future scalability is anticipated.
How should decoupling capacitors be sized and placed for optimal stability when using the ATMEGA8515L-8JU in compact handheld devices?
Effective decoupling for the ATMEGA8515L-8JU requires a combination of bulk and high-frequency capacitors strategically located near the Vcc and AVcc pins. Typically, a 10µF tantalum or ceramic capacitor handles low-frequency stabilization and bulk energy storage, while a 0.1µF monolithic ceramic capacitor filters high-frequency noise from digital switching. Both should be mounted as close as physically possible to the MCU’s power pins, ideally within 5mm, to minimize loop inductance. In handheld designs with limited board area, placing these components on the same side as the IC and avoiding vias in the return path improves effectiveness. Additionally, separate bypass networks for analog and digital supplies help isolate noise coupling, particularly important given the shared power rail in single-supply configurations. Simulation or empirical testing under worst-case load transients is recommended to validate performance.
What considerations arise when bootloading code onto the ATMEGA8515L-8JU using ISP programming, and how does the bootloader segment affect flash memory utilization?
The ATMEGA8515L-8JU supports in-system programming (ISP) via the SPI interface, enabling firmware updates without removing the chip. When deploying a bootloader, a portion of the 8KB flash (typically 512–1024 bytes) is reserved for boot code, leaving less space for user application code. This reduces available program memory proportionally, which may force code refactoring or compression if complex algorithms are involved. Bootloaders usually implement simple serial protocols like STK500 or custom UART-based schemes, requiring careful attention to stack usage and interrupt latency during programming sequences. Also, the bootloader execution starts at address 0x1C00 (for 512-byte boot section), so vector tables must be relocated accordingly. Proper fuse bit configuration ensures the RSTDISBL and DWEN fuses remain unaltered to preserve ISP capability throughout the product lifecycle.

Parts with Similar Specifications

The three parts on the right have similar specifications to Atmel ATMEGA8515L-8JU

Product Attribute ATMEGA8515L-8JUR ATMEGA8515L-8JU ATMEGA8515L-8AUR ATMEGA8515L-8MJ
Part Number ATMEGA8515L-8JUR ATMEGA8515L-8JU ATMEGA8515L-8AUR ATMEGA8515L-8MJ
Manufacturer Microchip Technology Microchip Technology Atmel Microchip Technology
Core Processor - - - -
Program Memory Type - - - -
Connectivity - - - -
Number of I/O - - - -
Oscillator Type - - - -
Series - - - -
Speed - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
EEPROM Size - - - -
RAM Size - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Core Size - - - -
Program Memory Size - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Voltage - Supply (Vcc/Vdd) - - - -
Data Converters - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Peripherals - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42

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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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ATMEGA8515L-8JU Image

ATMEGA8515L-8JU

Atmel
32D-ATMEGA8515L-8JU

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