ATMEGA8515L-8MU - 8KB Flash AVR MCU 44-VQFN | Microchip
料号： ATMEGA8515L-8MU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.55 | $3.55 |
| 10 | $3.31 | $33.10 |
| 100 | $2.98 | $298.00 |
| 500 | $2.76 | $1,380.00 |
| 1,000 | $2.54 | $2,540.00 |
ATMEGA8515L-8MU 概述
A microcontroller unit (MCU) integrates a processor core, program memory, data memory, and peripherals onto a single chip, forming the lowest layer of the embedded-system hierarchy: transistor -> logic IC -> microcontroller -> embedded system. The AVR architecture uses a Harvard design with 130 powerful instructions, most executing in a single clock cycle, which yields high code efficiency for C and assembly programs.
Key features of the ATMEGA8515L-8MU include in-system programmable (ISP) Flash via SPI, one 16-bit timer and two 8-bit timers with PWM outputs, a USART serial port, SPI interface, external memory bus (AD0-AD7 / A0-A7 ports), an on-chip analog comparator, four external interrupt sources, and low-power idle and power-down sleep modes. The 'L' suffix denotes the low-voltage 2.7V-5.5V grade, and the -8 speed grade caps the clock at 8 MHz.
Technically, the AVR core executes most instructions in one cycle through its pipelined RISC datapath, so an 8 MHz ATMEGA8515L-8MU approaches the effective throughput of far faster CISC MCUs on 8-bit workloads. The 512B EEPROM retains calibration data through power cycles, while the 64KB external SRAM expansion suits data-logging designs.
Typical applications include industrial control panels, motor-driven appliances, keypad/display terminals, and legacy AVR drop-in designs where the VQFN footprint must be preserved.
Design consideration: choose the MLF/VQFN thermal pad for heat sinking and ground return, and always verify ISP programming voltage and fuse settings (CKOPT, BODLEVEL) before flashing at 5V.
This page synthesizes distributor pricing, pinout guidance, drop-in alternatives, and design notes not found in the manufacturer datasheet alone.
直接替换替代料： ATMEGA8515L-8MU ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATMEGA8515L-8MU （相同外形与封装尺寸） ——差异在于 Package, Core Architecture, SRAM, Flash Memory, Instruction Set.
快速对比工具——选择替代料号进行并排对比：
ATMEGA8515L-8MC
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.72 / 个
查看数据手册 →ATMEGA8515-16MU
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.12 / 个
查看数据手册 →ATMEGA8515-16MC
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$3.15 / 个
查看数据手册 →ATMEGA8515L-8MI
✅ 直接替换📋 参考替代料（不在目录中）
ATMEGA8515L-8MU 最大额定值与电气特性
| Core Architecture | 8-bit AVR RISC |
| Flash Memory | 8 KB (4K x 16) In-System Programmable |
| EEPROM | 512 B |
| Internal SRAM | 512 B |
| External Memory Support | Up to 64 KB external SRAM |
| Maximum Clock Speed | 8 MHz (-8 speed grade) |
| Supply Voltage Range | 2.7 V to 5.5 V (low-voltage 'L' grade) |
| Throughput | Up to 16 MIPS at 16 MHz (family max); ~8 MIPS at 8 MHz for this grade |
| Instruction Set | 130 powerful instructions, mostly single-cycle |
| 封装 | 44-VQFN (7x7 mm), 0.8 mm pitch, exposed pad |
| 安装类型 | Surface Mount |
| Peripherals | USART, SPI, analog comparator, 8-bit and 16-bit timers with PWM |
| External Interrupts | 4 sources |
| Sleep Modes | Idle, Power-down (low power) |
| 工作温度 | Industrial temperature range (ind temp) |
| Package Dimensions | 7 x 7 mm, 1 mm height, 0.8 mm pitch |
| RoHS 状态 | Green / RoHS-compliant listing |
ATMEGA8515L-8MU 7 x 7 mm, 1 mm height, 0.8 mm pitch 引脚配置指南
ATMEGA8515L-8MU（7 x 7 mm, 1 mm height, 0.8 mm pitch 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： ATMEGA8515L-8MU.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATMEGA8515L-8MU 适用于 6 应用s: Industrial Control Panels, Keypad and Display Terminals, Legacy AVR Board Replacements, Motor-Driven Appliances, Data Logging with External SRAM, Security and Access Control.
Industrial Control Panels
The ATMEGA8515L-8MU fits industrial control and relay-sequencing panels because its 2.7V-5.5V supply grade tolerates noisy 5V rails, its four external interrupt sources respond quickly to limit switches and sensors, and its industrial temperature rating suits control cabinets. The 8KB ISP Flash holds ladder-style logic in compact C or assembly code, and the external memory interface supporting up to 64KB SRAM accommodates event logging. Implement the design with the timers' PWM outputs for actuator drive and the USART for Modus-style serial links; the 8 MHz grade is adequate because panel-scan loops typically run in the kilohertz range, keeping power dissipation and EMI low inside the enclosure.
推荐
Keypad and Display Terminals
Human-machine interface terminals - keypad scanners, LCD character-display heads, and operator panels - benefit from the ATMEGA8515L-8MU's four 8-bit I/O ports, which directly drive a 4x4 matrix keypad and a parallel LCD bus simultaneously. Its 512B EEPROM stores user settings and calibration values through power cycles, while the on-chip USART links the terminal to a host PLC or PC at standard baud rates. The 44-VQFN (7x7) package saves board area versus the PDIP variant for compact bezel-mounted PCBs. Because these terminals rarely need more than a few MIPS, the 8 MHz speed grade keeps code timing deterministic without any external oscillator, and the internal power-down mode trims standby current between touch events.
推荐
Legacy AVR Board Replacements
Many installed AT90S8515 and early AVR designs still run in the field; the ATMEGA8515L-8MU is the modern Microchip drop-in for these sockets in MLF/VQFN footprints, retaining the same 8KB Flash map, pinout, and peripheral set while adding ISP programming. Replacing an obsolete AT90S8515-based board with this part preserves firmware compatibility at the C source level, since Microchip maintained AVR instruction-set continuity. In repairs and end-of-life service builds, stock the -8MU alongside its TQFP sibling ATMEGA8515L-8MI so both package generations can be serviced; verify fuse (CKOPT, BODLEVEL) settings during reflash, as legacy fuse defaults differ from current production defaults in some programmer toolchains.
推荐
Motor-Driven Appliances
Household and commercial appliances with brushed-DC or universal motors use the ATMEGA8515L-8MU's timers with PWM outputs to generate phase-correct motor-drive waveforms, while the analog comparator supports zero-crossing or current-limit detection without an external ADC. The 8 MHz clock and single-cycle instruction execution give deterministic control-loop timing, and the 2.7V-5.5V supply rides through mains-supply brownouts when paired with a simple linear regulator. The exposed-pad VQFN package provides a robust ground connection that reduces radiated emissions from the PWM edges, easing EMC testing. Keep firmware watchdog supervision enabled and use the power-down mode between user interactions to trim standby power toward regulatory efficiency targets.
推荐
Data Logging with External SRAM
When 512B of internal SRAM is insufficient, the ATMEGA8515L-8MU's external memory interface - address ports up to 64KB - lets designs attach standard SRAM chips for buffered sensor logging, something few small AVR MCUs offer. The USART streams batches to a host or modem, while the 512B EEPROM stores configuration and rolling counters that must survive power loss. Timer-based sampling in C is straightforward thanks to single-cycle execution at 8 MHz, and the power-down mode protects battery-backed installations between sampling windows. Typical companion parts are a 32KB or 64KB static RAM, an RS-232 level translator on the USART, and a supervisor IC on the 5V rail to trigger safe data commits during brownout.
推荐
Security and Access Control
Door controllers, code-lock keypads, and small alarm panels exploit the ATMEGA8515L-8MU's four external interrupts for instant tamper and door-sensor response, the EEPROM for PIN and event storage, and the SPI or USART for encrypted backhaul to a central panel. The 8 MHz AVR core executes lightweight checksum and cipher routines with deterministic timing, and the 2.7V-5.5V supply range supports battery-backed operation after mains failure. The compact 7x7 mm VQFN package fits cramped reader housings, and its exposed thermal pad doubles as a solid chassis ground for ESD robustness at the door interface. Design the front end with TVS protection on interrupt lines and supervise the rail with a reset IC for tamper-safe restarts.
推荐
推荐产品汇总
工程参考数据： ATMEGA8515L-8MU ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ATMEGA8515L-8MC | ATMEGA8515-16MU | ATMEGA8515-16MC | ATMEGA8515L-8MI |
|---|---|---|---|---|---|
| Package | 44-VQFN (7x7 mm), 0.8 mm pitch | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same | 44-TQFP (7x7 mm) - different body style |
| Brand | Microchip Technology (Atmel legacy) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 8 KB (4K x 16) ISP | 8 KB | 8 KB | 8 KB | 8 KB |
| Maximum Clock Speed | 8 MHz | 8 MHz | 16 MHz | 16 MHz | 8 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V (16C speed/voltage curve per datasheet) | 2.7 V to 5.5 V |
| EEPROM | 512 B | 512 B | 512 B | 512 B | 512 B |
| Internal SRAM | 512 B (+ up to 64 KB external) | 512 B (+ 64 KB external) | 512 B (+ 64 KB external) | 512 B (+ 64 KB external) | 512 B (+ 64 KB external) |
| Drop-in Compatibility on VQFN-44 Footprint | Reference part | Yes - pin-to-pin | Yes - pin-to-pin | Yes - pin-to-pin | No - TQFP land pattern differs |
关键差异点
- True MLF/VQFN-44 footprint with same-silicon second source （对比 ATMEGA8515L-8MC)
- Low-voltage operation where 16 MHz grades cannot go （对比 ATMEGA8515-16MU)
- External memory expansion rare in its class （对比 ATMEGA8515L-8MI)
设计说明
The 44-VQFN (7x7 mm, 0.8 mm pitch) package has an exposed center pad that must be soldered to a ground pour for both mechanical reliability and low-inductance ground return. Use 4x4 via arrays (0.3 mm vias) in the pad connecting to the internal ground plane, per Microchip MLF layout guidance. Pin 1 is indicated by the dot marker at the top-left of the land pattern; verify the MLF-to-TQFP pin-ordering difference before reusing any layout from a TQFP-44 ATmega8515 board, because the two packages do not share identical pin positions.
The 'L' grade guarantees 2.7V-5.5V operation only at the -8 speed grade; do not assume the datasheet 16 MIPS figure applies. Decouple VCC with 0.1 uF ceramic at each supply pin plus 4.7-10 uF bulk near the regulator. If running from 3.3V, confirm the maximum clock on the datasheet frequency-vs-voltage curve before fixing the crystal - the 'L' grade relaxes voltage but the safe clock at reduced VCC must still be respected. Brownout detector fuse (BODLEVEL) should be enabled for 5V designs to prevent Flash corruption during brownouts.
Two frequent errors when migrating within the ATmega8515 family: (1) mixing up speed grades - the -8MU tops out at 8 MHz, so a 16 MHz crystal will cause misbehavior out of specification; use ATMEGA8515-16MU instead for 16 MHz designs. (2) Fuse settings - ISP programming requires SPIEN unprogrammed-to-enabled defaults and CKOPT selection for the crystal range; wrong CKOPT can prevent oscillator startup at 8 MHz on 5V boards. Always read fuses before modification and keep a known-good fuse record per board revision.
合规信息
Listed as GREEN (RoHS-compliant) in distributor specification databases (FindIC). REACH, halogen-free and conflict-minerals declarations should be requested from Microchip directly.
