ATMEGA8515L-8JI - 8MHz AVR MCU 8KB Flash 44-PLCC | Microchip
MPN： ATMEGA8515L-8JI ✓ 啟用中ATMEGA8515L-8JI 概覽
An AVR ATmega microcontroller is a member of the 8-bit microcontroller family built on the AVR enhanced RISC architecture, in which most of its 130 powerful instructions execute in a single clock cycle. Within the system hierarchy, it sits at the level of an MCU (microcontroller unit), integrating CPU, program memory, data memory, peripherals, and I/O ports in one chip for embedded control applications.
Key features include fully static operation, up to 8 MIPS throughput at 8 MHz (the family scales to 16 MIPS at 16 MHz), and an external memory interface (EBI/EMI) that addresses up to 64 KB of external SRAM - a distinctive capability of the ATmega8515 within the AVR portfolio. The device also provides SPI and UART/USART serial interfaces, flexible interrupt handling, and in-system programmable flash for firmware updates without removing the chip from the board.
Architecturally, the ATmega8515 couples an AVR RISC core with Harvard memory organization, 32 general-purpose working registers directly connected to the ALU, and dedicated timer/PWM and serial peripherals. The 44-PLCC package exposes four 8-bit general-purpose I/O ports (PA, PB, PC, PD) plus the additional Port E function pins, with J-leads suited to through-hole-style PLCC sockets that simplify replacement during prototyping and field service.
Typical applications include industrial control and automation, legacy embedded equipment maintenance, communication interfaces using UART and SPI, and motor or relay control tasks where external memory expansion is required.
For design work, note that the "L" variant is rated for 8 MHz maximum clock; designs needing 16 MHz operation should select the ATMEGA8515-16x speed grade instead, and supply voltage range must be confirmed against the datasheet before reuse across speed grades.
This page synthesizes distributor listings, drop-in alternative cross-references, and practical design guidance not consolidated in the manufacturer datasheet.
直接替換替代品，適用於 ATMEGA8515L-8JI — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ATMEGA8515L-8JI （相同外形與佔位） — 差異在於 Package, Communication Interfaces, Core Architecture, Throughput, External Memory Interface.
ATMEGA8515L-8JU
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA8515-16JI
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA8515-16JC
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA8515-16MJ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →AT90S8515-8JI
✅ 直接替換📋 參考替代品（不在目錄中）
ATMEGA8515L-8MJ
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ATMEGA8515L-8JI 最大額定值與電氣特性
| Core | AVR 8-bit RISC |
| 最大時脈頻率 | 8 MHz |
| Program Memory Size | 8 KB (4K x 16) FLASH |
| Program Memory Type | In-System Programmable FLASH |
| SRAM Size | 512 B internal (544 B including 32 general purpose registers) |
| External SRAM Support | Up to 64 KB |
| EEPROM Size | 512 B |
| Instruction Set | 130 powerful instructions, most single-clock-cycle |
| Throughput | Up to 8 MIPS at 8 MHz (family scales to 16 MIPS at 16 MHz) |
| Communication Interfaces | SPI, UART/USART, EBI/EMI external memory interface |
| Timers/Counters | Two 8-bit, one 16-bit with PWM outputs |
| ADC | Not present (no on-chip ADC on ATmega8515) |
| I/O Ports | 4 x 8-bit general purpose ports plus Port E function pins |
| 封裝 | 44-PLCC (J-lead), 16.6 x 16.6 mm |
| 安裝類型 | Surface Mount |
ATMEGA8515L-8JI 44-plcc (j-lead), 16.6 x 16.6 mm 腳位配置指南
ATMEGA8515L-8JI（44-plcc (j-lead), 16.6 x 16.6 mm 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： ATMEGA8515L-8JI.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATMEGA8515L-8JI 適用於 6 應用s: Industrial Control and Automation, Legacy Equipment Repair and Maintenance, External Memory Expansion Systems, Serial Communication Interfaces, PWM and Timer-Based Control, Education and Prototyping.
Industrial Control and Automation
The ATMEGA8515L-8JI fits industrial control because its AVR RISC core executes most of its 130 instructions in a single clock cycle, giving deterministic timing for relay sequencing, motor start-stop logic, and sensor polling at up to 8 MIPS at 8 MHz. Four 8-bit I/O ports (PA through PD) provide up to 32 GPIO lines that drive optocouplers, relays, and indicator LEDs directly with appropriate buffering. The UART/USART supports serial links to HMIs and field devices, while SPI connects external ADCs or EEPROMs. The 44-PLCC socketed package allows field firmware and chip replacement without board rework, a practical advantage for long-life industrial equipment maintenance.
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Legacy Equipment Repair and Maintenance
Legacy embedded equipment designed around the Atmel ATmega8515 or AT90S8515 in PLCC-44 sockets is a natural fit for the ATMEGA8515L-8JI, which is pin-to-pin compatible with these predecessors on the same 16.6 x 16.6 mm footprint. Service engineers can replace a failed or EOL device directly into the existing socket and reprogram the 8 KB ISP FLASH in-system over SPI. Because the 'L' grade runs the same 8 MHz clock as most legacy designs, firmware does not require re-timing. The ATMEGA8515L-8JU lead-free variant is a like-for-like substitute where RoHS-compliant repairs are required by regulation or customer contract.
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External Memory Expansion Systems
The defining feature of the ATmega8515 within the AVR portfolio is its external memory interface (EBI/EMI), which addresses up to 64 KB of external SRAM - a capability the ATMEGA8515L-8JI provides from its own 512 B of internal SRAM. Applications such as data loggers, buffering systems, and protocol analyzers map large external SRAM arrays onto Port A (address/data) and Port C via the EBI, while the UART streams results to a host. Running at 8 MHz, the core sustains roughly 8 MIPS for memory-move and checksum workloads. This makes the device well suited where 8 KB flash suffices but working memory must be far larger.
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Serial Communication Interfaces
With a hardware UART/USART and SPI interface, the ATMEGA8515L-8JI serves well as a serial protocol converter, RS-485 node, or SPI peripheral bridge in 8 MHz embedded systems. The UART supports standard asynchronous baud rates derived from the 8 MHz clock for links to PCs, modems, and industrial buses, while the SPI master/slave port connects EEPROMs, RTCs, displays, and external ADCs at multi-megabit rates. The 130-instruction single-cycle AVR core keeps interrupt latency short and deterministic, which is important for reliable framing and CRC handling. The 44-PLCC package's GPIO complement also allows bit-banged protocols such as 1-Wire or I2C when needed.
推薦
PWM and Timer-Based Control
The ATMEGA8515L-8JI integrates two 8-bit timers and one 16-bit timer with output-compare channels generating PWM outputs (OC0, OC1A, OC1B), making it suitable for LED dimming, DC motor speed control, and servo pulse generation. At an 8 MHz clock, the 16-bit timer delivers fine PWM resolution, and single-cycle instruction execution keeps control-loop interrupts responsive. Combined with the UART for setpoint updates and up to 64 KB external SRAM for waveform tables, the device implements complete closed-loop controllers. The Port E analog-comparator inputs (AIN0/AIN1) support simple threshold sensing without an external comparator in many designs.
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Education and Prototyping
The ATMEGA8515L-8JI is well suited to university labs, AVR training boards, and hobby prototyping because the PLCC-44 package seats into low-cost ZIF-style PLCC sockets, allowing students to swap chips without soldering. The classic AVR architecture - 32 registers, 130 single-cycle instructions, ISP flashing over SPI - remains a standard teaching platform, and abundant legacy tutorials and assembler examples target the ATmega8515 specifically. The external memory interface also demonstrates memory-system concepts (address latching, wait states) rarely exposed on smaller AVRs. At 8 MHz with 8 KB flash it matches the classic AVR development board configurations still in circulation.
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推薦產品摘要
工程參考資料，適用於 ATMEGA8515L-8JI — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ATMEGA8515L-8JU | ATMEGA8515-16JI | ATMEGA8515-16JC | AT90S8515-8JI |
|---|---|---|---|---|---|
| Package | 44-PLCC (16.6x16.6) | 44-PLCC (16.6x16.6) - same | 44-PLCC (16.6x16.6) - same | 44-PLCC (16.6x16.6) - same | 44-PLCC (16.6x16.6) - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) |
| Max Clock Frequency | 8 MHz | 8 MHz | 16 MHz | 16 MHz | 8 MHz |
| Flash Program Memory | 8 KB (4K x 16) | 8 KB (4K x 16) | 8 KB (4K x 16) | 8 KB (4K x 16) | 8 KB |
| SRAM | 512 B (+ up to 64 KB external) | 512 B (+ up to 64 KB external) | 512 B (+ up to 64 KB external) | 512 B (+ up to 64 KB external) | 512 B |
| EEPROM | 512 B | 512 B | 512 B | 512 B | 512 B |
| External Memory Interface | Yes, up to 64 KB | Yes, up to 64 KB | Yes, up to 64 KB | Yes, up to 64 KB | Limited (predecessor implementation) |
| Lead Finish / RoHS Variant | Standard (I suffix) | Lead-free (U suffix) | Standard (I suffix) | Standard (I suffix) | Standard (I suffix) |
| Temperature Grade | Industrial (J) | Industrial (J) | Industrial (I/J) | Commercial (C) | Industrial (J) |
主要差異化特點
- Low-voltage 8 MHz L speed grade (對比ATMEGA8515-16JI)
- Lead-free plating variant available (對比ATMEGA8515L-8JU)
- Modern ATmega core with external memory interface (對比AT90S8515-8JI)
設計說明
Speed and voltage grade must match: the 'L-8' suffix means the 8 MHz low-voltage speed grade, while ATMEGA8515-16x parts are rated for 16 MHz at higher supply voltage. Substituting a 16 MHz part where firmware timing (UART baud registers, delay loops) was calibrated for 8 MHz changes all derived timings; likewise, running an L-8 part beyond 8 MHz violates its rating. When replacing an -8JI with a -16JI on the same board, confirm the power rail meets the 16 MHz grade's minimum supply voltage per the datasheet ordering-code table.
The 44-PLCC J-lead package is designed for standard PLCC-44 land patterns on a 1.27 mm pitch, and many legacy boards use through-hole PLCC sockets. If designing new, verify the pin-1 corner marking (the PLCC notch and index dot use counter-clockwise pin numbering) against the land pattern, since PLCC orientation errors are a common assembly defect. For reflow with the 'I' (non-lead-free) lead finish, confirm the solder profile compatibility with your process - the 'U' suffix lead-free variant requires a lead-free reflow profile.
The external memory interface (EBI/EMI) drives up to 64 KB of external SRAM across Port A (multiplexed address/data) and Port C; keep external memory traces short and add an address latch (e.g., 74x573) close to the MCU per the datasheet external memory figure. At 8 MHz, ringing and stub reflections are rarely limiting, but series termination near long bus lines improves margin. Decouple VCC and AVCC separately with 100 nF ceramic capacitors placed directly at the package pins, and tie AREF to a clean reference if the analog comparator is used.
合規資訊
The 'I' suffix denotes the standard lead finish; the 'U' suffix variant (ATMEGA8515L-8JU) denotes the lead-free/RoHS-friendly finish per Atmel/Microchip ordering conventions. Exact RoHS/REACH status for the -8JI should be confirmed on the Microchip product page or the distributor compliance certificate.
