ATMEGA6450A-AUR - 8-Bit AVR MCU 20MHz 64KB Flash | Microchip
料号： ATMEGA6450A-AUR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.28 | $6.28 |
| 10 | $5.95 | $59.50 |
| 100 | $5.45 | $545.00 |
| 500 | $5.05 | $2,525.00 |
| 1,000 | $4.65 | $4,650.00 |
ATMEGA6450A-AUR 概述
An 8-bit AVR microcontroller is a reduced-instruction-set (RISC) single-chip computer that executes most instructions in a single clock cycle. Within the power-management and embedded-control hierarchy, an MCU integrates a processor core, program Flash, data SRAM, nonvolatile EEPROM, timers, serial interfaces, and an ADC on one die, replacing multi-chip board-level logic. The AVR ATmega family is one of the most widely deployed 8-bit MCU architectures, also known through the Arduino ecosystem.
Key features include the advanced RISC architecture with 130 powerful instructions, most executing in a single cycle, delivering up to 16 MIPS at 16 MHz (20 MIPS at 20 MHz). The device provides an 8-channel 10-bit ADC, a JTAG interface for on-chip debugging and boundary scan, and In-System Programmable (ISP) Flash allowing firmware updates on the assembled PCB.
The ATmega6450A core achieves near-1 MIPS/MHz efficiency through a Harvard architecture with separate instruction and data buses, single-cycle ALU operations, and fast register file access across 32 general-purpose working registers.
Typical applications include industrial control panels with many I/O points, LCD-equipped instruments and metering products, building automation nodes, and legacy AVR designs requiring 64KB code density in a large-pin-count TQFP footprint.
When designing with this device, verify the operating voltage range of 2.7V to 5.5V against your clock frequency choice, as maximum safe frequency derates at lower supply voltages.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： ATMEGA6450A-AUR ——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： ATMEGA6450A-AUR （相同外形与封装尺寸） ——差异在于 SRAM, Core Architecture, Flash Memory, EEPROM, Working Registers.
快速对比工具——选择替代料号进行并排对比：
ATMEGA6450P-AUR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$4.18 / 个
查看数据手册 →ATMEGA6490A-AUR
✅ 直接替换✓ 有现货
$6.55 / 个
查看数据手册 →ATMEGA6490P-AU
✅ 直接替换📋 参考替代料（不在目录中）
ATMEGA3250A-AUR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$3.55 / 个
查看数据手册 →ATMEGA3290P-20AUR
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →ATMEGA6450A-AU
✅ 直接替换✓ 有现货
$5.95 / 个
查看数据手册 →ATMEGA6450A-AUR 最大额定值与电气特性
| Core Architecture | AVR 8-bit RISC |
| Core Size | 8-Bit |
| Max Clock Frequency | 20 MHz |
| Flash Memory | 64KB (32K x 16) In-System Programmable |
| SRAM | 4KB |
| EEPROM | 2KB |
| Number of I/O | 68 programmable I/O lines |
| Operating Voltage Range | 2.7 V to 5.5 V |
| ADC Resolution | 10-bit, 8-channel |
| Debug Interface | JTAG (on-chip debugging and ICSP) |
| Instruction Count | 130 powerful instructions, most single-cycle |
| Throughput | 16 MIPS at 16 MHz |
| 封装 | 100-TQFP (14x14 mm) |
| 安装类型 | Surface Mount |
| Program Memory Type | FLASH |
| RoHS 状态 | Compliant (R suffix = Tape & Reel, lead-free) |
ATMEGA6450A-AUR 100-tqfp (14x14 mm) 引脚配置指南
ATMEGA6450A-AUR（100-tqfp (14x14 mm) 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： ATMEGA6450A-AUR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATMEGA6450A-AUR 适用于 6 应用s: Industrial Control Panels, Metering and Instrumentation, Building Automation Nodes, Legacy AVR Design Continuation, Data Acquisition Front Ends, Consumer and Hobby Embedded Systems.
Industrial Control Panels
The ATMEGA6450A-AUR's 68 programmable I/O lines make it a strong fit for industrial control panels that must drive relays, read limit switches, and interface to HMI modules without external port expanders. Its 20MHz AVR core executes most of its 130 instructions in a single cycle, providing deterministic timing for scan loops and interlock logic, while the 8-channel 10-bit ADC handles analog sensor inputs such as potentiometers, thermistors, and 4-20mA-derived signals with external conditioning. The 64KB ISP Flash accommodates large state machines and modbus-style communication stacks, and the JTAG interface enables on-chip debugging of deployed designs. Because it operates from a 5V industrial logic domain (2.7V to 5.5V range), it interfaces directly with 5V PLC-style signaling, simplifying level-shifting design compared with 3.3V-only MCUs.
推荐
Metering and Instrumentation
Energy meters, water meters, and bench instrumentation benefit from the ATMEGA6450A-AUR's combination of a 10-bit, 8-channel ADC for analog measurement, 2KB EEPROM for nonvolatile calibration and tariff data, and abundant I/O for keypad scanning and display control. The EEPROM retains calibration coefficients across power cycles without external memory, and the 4KB SRAM supports buffered measurement histograms and communication payloads. Designs that later require a directly driven segment LCD can migrate to the pin-compatible ATMEGA6490A family without PCB respin, protecting the hardware investment. Running up to 20MHz at 5V, the device delivers roughly 20 MIPS, sufficient for pulse-counting accumulation, multi-point linearization, and serial meter-bus protocols executed in firmware with predictable cycle budgets.
推荐
Building Automation Nodes
In building automation, the ATMEGA6450A-AUR serves as a node controller integrating damper actuator control, occupancy sensing, and RS-485 fieldbus communication. The 68 I/O lines cover multiple relay outputs, triac drivers, and status LEDs simultaneously, while UART-based firmware implements protocols such as Modbus RTU. The 64KB Flash leaves headroom for protocol stacks plus OTA-style firmware updating through the In-System Programmable interface, and the JTAG port supports boundary-scan production testing of the assembled board. Because the ATmega core is single-cycle for most instructions, interrupt latency is short and predictable, which matters for encoder tracking and pulse metering in HVAC applications. The wide 2.7V to 5.5V supply range tolerates brownout conditions common in large building installations.
推荐
Legacy AVR Design Continuation
Many products designed in the Atmel era still depend on the ATmega6450A die; the AUR variant keeps those designs in production with an active, RoHS-compliant part. Because the ATMEGA6450A-AUR shares the identical 100-TQFP footprint, firmware toolchain (AVR GCC / Microchip Studio), and ICSP programming flow as its predecessors, existing HEX images and programmer fixtures carry over without modification. The 130-instruction AVR RISC core ensures instruction-level compatibility across the ATmega family, and JTAG retains in-circuit debugging on legacy boards. Procurement teams can also qualify the picoPower ATMEGA6450P-AUR as a pin-compatible second source, adding lower sleep current as a free upgrade path while maintaining drop-in PCB compatibility for supply-chain resilience.
推荐
Data Acquisition Front Ends
The ATMEGA6450A-AUR works well as the controller of medium-speed data acquisition front ends: its 8-channel 10-bit ADC samples multiple analog inputs under firmware control, while the 4KB SRAM buffers acquisition records before streaming over UART or SPI. Timer resources support precisely spaced sampling and PWM-based excitation for sensor bridges. The 20MHz maximum clock gives roughly 20 MIPS of processing headroom for filtering, averaging, and linearization in integer arithmetic, and the single-cycle multiply-friendly AVR instruction set keeps DSP-style loops efficient. Because the analog domain runs from the same supply as the core (2.7V to 5.5V), a quiet 5V rail plus careful AVCC filtering yields respectable 10-bit noise performance for industrial-grade, non-laboratory accuracy targets.
推荐
Consumer and Hobby Embedded Systems
Makers and product designers familiar with the Arduino AVR ecosystem can use the ATMEGA6450A-AUR where a standard Arduino board runs out of I/O or code space. The 64KB Flash and 68 I/O lines support large sketches with many peripherals - LED matrices, stepper drivers, rotary encoders, and menu-driven LCD interfaces - on a single chip. The part programs with the same ICSP method used by ATmega328 boards (via an ISP programmer such as MPLAB SNAP), and AVR GCC toolchains treat it identically. The 2KB EEPROM stores user settings, and the 8-channel ADC reads analog joysticks and sensors directly at 5V. For designs needing segment LCDs, the pin-compatible ATMEGA6490 family offers a no-respin upgrade path.
推荐
推荐产品汇总
工程参考数据： ATMEGA6450A-AUR ——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 | ATMEGA6450P-AUR | ATMEGA6490A-AUR | ATMEGA3290P-20AUR | ATMEGA3250A-AUR |
|---|---|---|---|---|---|
| Package | 100-TQFP (14x14 mm) | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) |
| Flash Memory | 64KB ISP Flash | 64KB | 64KB | 32KB | 32KB |
| SRAM | 4KB | 4KB | 4KB | 2KB | 2KB |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| LCD Segment Driver | No | No | Yes (integrated) | Yes (integrated) | No |
| PicoPower Technology | No (A-series) | Yes | No | Yes | No |
| General-Purpose I/O | 68 lines | 68 lines | Fewer (shared with LCD driver) | Fewer (shared with LCD driver) | 68 lines |
关键差异点
- Full 68 I/O without LCD pin sharing （对比 ATMEGA6490A-AUR)
- Double the Flash and SRAM vs 32KB siblings （对比 ATMEGA3290P-20AUR)
- No picoPower (A-series) lowest base cost （对比 ATMEGA6450P-AUR)
设计说明
Estimated: an 8-bit AVR core draws only tens of milliamps at 20MHz and 5V, so the LDO sizing is dominated by I/O loads, not the core. Budget external loads per port pin (20 mA absolute max per AVR I/O pin in the family) and provide decoupling: 100 nF ceramic at each VCC/AVCC pin pair plus 10 uF bulk. Remember AVCC must stay within VCC +/- 0.3V and must be connected even if the ADC is unused, or the ADC port pins may not function as digital I/O.
Route the JTAG (TCK, TMS, TDO, TDI) as a 4-pin header to a production test point even if debugging is done via ICSP; JTAG also provides boundary scan for assembled-board verification. Keep the XTAL1/XTAL2 crystal traces short (under 15 mm) and guard them with ground, placing load capacitors within 3 mm of the pins. Place the 100 nF VCC decouplers directly beneath the 14x14 mm TQFP center on the opposite layer with short vias to the ground plane.
Maximum safe clock frequency derates with supply voltage in AVR devices; do not run 20MHz below the voltage the datasheet speed-grade curve allows - at low VCC use a lower crystal or the internal RC oscillator. Also avoid driving RESET low for long periods during brownouts without a supervisor; enable the internal brown-out detector fuse. Verify fuse settings (clock source, JTAGEN, SPIEN) before first ICSP - disabling SPIEN with the wrong clock fuse bricks the part to the point of needing high-voltage parallel programming.
合规信息
R suffix indicates lead-free Tape & Reel packaging per Microchip convention; RoHS compliance per current Microchip production status. AEC-Q100 qualification not indicated for this consumer/industrial-grade part.
