ATTINY44A-MU - 20MHz AVR MCU with 4KB Flash | Microchip
料号： ATTINY44A-MU ✓ 量产中ATTINY44A-MU 概述
An AVR microcontroller is a programmable semiconductor that integrates a CPU core, memory, timers, and peripheral interfaces on one device. The ATtiny44A belongs to the TinyAVR family, which sits below larger AVR devices in the hierarchy of RISC microcontroller, embedded processor, and integrated circuit. Its 32 general-purpose working registers support efficient execution of 8-bit instructions, while the 20-pin package supports compact PCB layouts in industrial, consumer, and battery-operated equipment.
Key features include 4 KB of ISP Flash, 256 B of EEPROM, 256 B of SRAM, 12 general-purpose I/O lines, and an 8-bit timer/counter with two PWM channels. The 20 MHz operating frequency provides substantially more processing headroom than lower-speed members of the same family. The ATTINY44A-MU is identified as an industrial-temperature, green, 1.8 V to 5.5 V device in the supplied distributor information.
The device uses the AVR 8-bit RISC architecture and provides a combination of GPIO, timer, PWM, serial programming, and analog-control capabilities. Its exposed thermal pad improves heat transfer from the die into the PCB, making copper-plane layout important even when the calculated device dissipation is modest. Applications can use the 12 I/O lines for switches, sensors, indicators, actuators, and digital communication signals.
Typical uses include industrial sensor nodes, compact motor controllers, battery-powered monitors, small appliances, embedded instrumentation, and low-cost control boards. The ATtiny44A is particularly suitable when a design needs more Flash and I/O than the smallest ATtiny devices but does not require the resources of a larger ATmega or ATxmega microcontroller. Its small 4 x 4 mm QFN/MLF package also supports space-constrained products.
Designers should place the exposed pad on a grounded copper area and follow the manufacturer's recommended decoupling and land-pattern requirements. Firmware must also account for the limited 256 B SRAM, while in-system programming permits programming and configuration after PCB assembly. The exact pin names, complete electrical limits, and thermal ratings should be confirmed against the manufacturer datasheet before layout release.
直接替换替代料： ATTINY44A-MU ——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： ATTINY44A-MU （相同外形与封装尺寸） ——差异在于 Flash Memory, Maximum Clock Frequency, Package.
ATTINY44-20MU
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATTINY44-16MU
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATTINY441-MU
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →ATTINY44A-MU 最大额定值与电气特性
| Microcontroller Type | 8-bit RISC-based AVR microcontroller |
| Product Family | ATtiny44A TinyAVR |
| 最大时钟频率 | 20 MHz |
| Flash Memory | 4 KB in-system programmable Flash |
| EEPROM | 256 B |
| SRAM | 256 B |
| General-Purpose I/O Lines | 12 |
| General-Purpose Working Registers | 32 |
| Timer/Counter | 8-bit timer/counter |
| PWM Channels | 2 |
| Operating Voltage Range | 1.8 V to 5.5 V |
| 封装 | 20-pin QFN/MLF, 4 x 4 mm |
| Exposed Pad | Present |
| 安装类型 | Surface mount |
| Temperature Grade | Industrial temperature |
| Green Product | Green |
| RoHS 状态 | Green product per supplied distributor information |
| Programming Interface | In-system programming |
ATTINY44A-MU 20-pin qfn/mlf, 4 x 4 mm 引脚配置指南
ATTINY44A-MU（20-pin qfn/mlf, 4 x 4 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： ATTINY44A-MU.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATTINY44A-MU 适用于 6 应用s: Industrial Sensor and Condition Monitoring, Compact Motor and Actuator Control, Battery-Powered Portable Instrument, Small Appliance Control, Embedded Communication Interface, Programmable Logic and Timing Controller.
Industrial Sensor and Condition Monitoring
The ATTINY44A-MU fits compact sensor nodes that must sample inputs, evaluate thresholds, and report machine conditions locally. Its 20 MHz AVR core provides useful timing headroom for interrupt-driven acquisition, while 4 KB of ISP Flash accommodates calibration logic and 256 B of EEPROM preserves configuration values between power cycles. Twelve I/O lines can support digital sensors, status indicators, alarm outputs, and a host interface. The 1.8 V to 5.5 V range permits operation across low-voltage industrial subsystems, and the 20-pin QFN/MLF package reduces board area. Firmware size must remain within 4 KB, so interrupt handlers and communication routines should be kept compact.
推荐
Compact Motor and Actuator Control
The ATTINY44A-MU is suitable for small motor, valve, and actuator controllers where a 20 MHz control loop, two PWM channels, and 12 I/O lines provide an efficient combination of capability and size. PWM outputs can command a compact driver, while the remaining GPIO handles limit switches, position sensors, and fault indication. Its 256 B SRAM is adequate for tightly scoped control tasks but not large motion buffers, so the application should avoid storing sampled waveforms in RAM. The 20-pin QFN/MLF footprint simplifies dense control boards, while its 1.8 V to 5.5 V supply range supports low-voltage system architectures.
推荐
Battery-Powered Portable Instrument
ATTINY44A-MU can serve as the primary controller in a small battery-powered instrument because its picoPower AVR design supports compact, low-voltage operation from 1.8 V to 5.5 V. The processor can implement button handling, display updates, alarms, and sensor conditioning without requiring a larger MCU package. Four kilobytes of Flash supports compact application firmware, while 256 B of EEPROM can retain user settings or calibration offsets. Battery life will depend on sleep-mode selection, wake-up behavior, sensor duty cycle, and regulator efficiency because exact consumption figures were not included in the supplied data.
推荐
Small Appliance Control
The ATTINY44A-MU is appropriate for small appliances that require local sequencing, user-interface handling, and motor or heater control without a high-end processor. Its 12 GPIO lines can divide among a keypad, display signals, relay drivers, and fault inputs, while two PWM channels support speed or power modulation. The 20 MHz clock supports responsive state-machine execution, and ISP programming simplifies production setup and firmware revision. Designers should budget the 4 KB Flash limit carefully when adding interface libraries, and should confirm that the 20-pin QFN/MLF land pattern is compatible with the appliance's production process.
推荐
Embedded Communication Interface
ATTINY44A-MU can act as a compact interface controller linking sensors or actuators to a higher-level system through serial, protocol-conversion, or status-reporting functions. Twelve GPIO lines leave sufficient external connectivity for a transceiver or serial device, and the 20 MHz processor can manage framing, checksums, and protocol timing within the constrained memory budget. The 4 KB Flash limit favors concise firmware, while 256 B of SRAM requires streaming rather than buffering large packets. In-system programming also supports configuration updates in assembled units, although the complete serial peripheral set and package-specific pin assignments must be checked in the manufacturer documentation.
推荐
Programmable Logic and Timing Controller
ATTINY44A-MU is well suited to deterministic sequencing, pulse timing, and programmable logic tasks where two PWM channels and a 20 MHz AVR clock provide useful computational headroom. Firmware can combine timers, interrupts, and GPIO events to coordinate lamps, triggers, test fixtures, or stepper-related signals. Four kilobytes of Flash is sufficient for compact state machines, and 256 B of SRAM supports short queues and working variables. Industrial-temperature ordering is identified for the ATTINY44A-MU, but the exact temperature limits and timing tolerances must be verified against the datasheet before deployment in safety- or mission-critical equipment.
推荐
推荐产品汇总
工程参考数据： ATTINY44A-MU ——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 | ATTINY44-20MU | ATTINY44-16MU | ATTINY441-MU |
|---|---|---|---|---|
| Package | 20-pin QFN/MLF (4 x 4 mm) | 20-pin QFN/MLF (4 x 4 mm) | 20-pin QFN/MLF (4 x 4 mm) | 20-pin QFN/MLF (4 x 4 mm) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 16 MHz | 20 MHz |
| Flash Memory | 4 KB | 4 KB | 4 KB | 2 KB |
| Program Memory Comparison | 4 KB, baseline | 4 KB, equal | 4 KB, equal | 2 KB, 50% less than target |
| Clock Comparison | 20 MHz, baseline | 20 MHz, equal | 16 MHz, 20% lower | 20 MHz, equal |
关键差异点
- Full 20 MHz clock capability （对比 ATTINY44-16MU)
- Twice the program memory of the reduced-memory alternative （对比 ATTINY441-MU)
- Identical clock and memory resources to the closest speed-matched option （对比 ATTINY44-20MU)
设计说明
Use the manufacturer's 20-pin QFN/MLF land pattern and place the exposed pad on a grounded copper region. The exposed pad is the principal thermal path and should not be left floating or connected only through a narrow trace. Follow the datasheet's recommended pad and via arrangement so solderability, ground return, and heat spreading are maintained; the supplied web excerpts establish the package and exposed pad but do not provide exact land-pattern dimensions.
Design the supply around the verified 1.8 V to 5.5 V operating range and confirm the exact operating-voltage limits for every alternate clock grade. Place the required bypass capacitors close to the supply and ground pins, while keeping high-current return paths separate from sensitive analog inputs. Because no verified power-consumption figures were supplied, use the manufacturer electrical characteristics for quiescent current and active-current calculations rather than estimating from clock speed alone.
Reserve all 20 package positions even if the application uses only a subset of functions. Verify analog-input, programming, reset, clock, power, and ground assignments against the official pin table before routing. The QFN/MLF package has closely spaced perimeter terminals, so use the manufacturer's pad dimensions and assembly guidelines; escaped traces should preserve the exposed-pad connection and avoid trapping assembly flux beneath the device.
Do not assume that any ATTiny44-family device is automatically interchangeable. ATTINY441-MU provides only 2 KB of Flash versus the ATTINY44A-MU's 4 KB, and lower-speed variants can alter timing assumptions. Check flash utilization, startup and clock-fuse requirements, interrupt behavior, ADC or peripheral differences, temperature grade, and the complete manufacturer pin table. Also confirm that the selected ordering suffix does not change the physical packing orientation required by the assembly process.
合规信息
The supplied distributor information identifies ATTINY44A-MU as a green product, but it does not explicitly state RoHS, REACH, halogen-free, conflict-minerals, or AEC-Q100 status. The industrial temperature designation does not by itself establish AEC-Q100 qualification.
