ATMEGA644PA-MU - 8-bit AVR MCU 64KB 20MHz VQFN-44 | Microchip
부품 번호: ATMEGA644PA-MU ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $5.9 | $5.90 |
| 10 | $5.31 | $53.10 |
| 100 | $4.6 | $460.00 |
| 500 | $4.13 | $2,065.00 |
| 1,000 | $3.78 | $3,780.00 |
ATMEGA644PA-MU 개요
An 8-bit AVR microcontroller is a single-chip processor built around an advanced RISC core in which most instructions execute in a single clock cycle, yielding approximately 1 MIPS per MHz. Within the power management and embedded control hierarchy, the ATmega family sits as a general-purpose flash microcontroller that integrates program memory, data memory, timers, serial interfaces, and an ADC on one die, replacing multi-chip MCU solutions in cost- and power-sensitive systems.
Key features of the ATMEGA644PA-MU include Microchip's picoPower technology for industry-leading low-power consumption, read-while-write Flash for self-programming, two programmable serial USARTs, a byte-oriented Two-Wire serial interface (I2C-compatible), an SPI serial interface, and three flexible timer/counters with compare modes and PWM. An 8-channel 10-bit ADC and a real-time counter (RTC) with a separate oscillator round out the peripheral set.
The advanced RISC architecture provides 131 powerful instructions, fully static operation, 32 x 8 general purpose working registers, and an on-chip 2-cycle hardware multiplier. In-system programmable (ISP) Flash with high endurance non-volatile memory segments supports field firmware updates, while the enhanced power-save modes make the part well suited to battery-powered designs.
Typical applications include industrial control and automation, sensor and data-logging nodes, consumer appliances, and battery-operated metering or monitoring products where 64 KB of program memory, rich peripherals, and low active/sleep current are required.
A key design consideration: the picoPower ATMEGA644PA achieves its lowest sleep currents only when unused peripherals and clock sources are disabled, and the 44-VQFN exposed pad should be soldered to a ground plane for thermal and signal-integrity performance.
This page synthesizes distributor availability, drop-in alternatives within the ATmega164A/324A/644A/1284 family, and practical design notes not found in the manufacturer datasheet. Pricing shown is estimated; verify current distributor pricing as of 2026-09-18 before ordering.
드롭인 대체품: ATMEGA644PA-MU — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: ATMEGA644PA-MU (동일 폼 팩터 및 풋프린트) — 차이점: Package, EEPROM, SRAM, Flash Memory, RoHS Status.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
ATMEGA644P-20MQ
✅ 드롭인✓ 재고 있음
$2.48 / 개
데이터시트 보기 →ATMEGA644-20MU
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ATMEGA1284P-MU
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$4.1 / 개
데이터시트 보기 →ATMEGA1284-MUR
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$1.72 / 개
데이터시트 보기 →ATMEGA324A-MU
✅ 드롭인✓ 재고 있음
$3.9 / 개
데이터시트 보기 →ATMEGA324PA-MU
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$2.05 / 개
데이터시트 보기 →ATMEGA644PA-MU 최대 정격 & 전기적 특성
| Core Architecture | 8-bit AVR RISC |
| Core Frequency | 20 MHz |
| Flash Memory | 64 KB (32K x 16) ISP Flash, read-while-write |
| EEPROM | 2 KB |
| SRAM | 4 KB |
| GPIO Count | 32 |
| MIPS Throughput | Up to 20 MIPS at 20 MHz |
| Instructions | 131 instructions, most single-cycle |
| Timer/Counters | Three flexible timer/counters with compare modes and PWM |
| USART | Two programmable serial USARTs |
| Serial Interfaces | Two-Wire Interface (I2C-compatible), SPI |
| ADC | 8-channel 10-bit ADC |
| RTC | Real Time Counter with separate oscillator |
| Low Power Technology | picoPower |
| Supply Voltage Range | 2.5 V / 3.3 V / 5 V class (per distributor listing: 2.5V/3.3V/5V) |
| 패키지 | 44-VQFN (7x7 mm), exposed pad |
| 실장 유형 | Surface Mount |
| RoHS 상태 | RoHS compliant (per Microchip product listing) |
| Data Sheet Document Number | DS40002070A (per Microchip ATMEGA644PA-MU data sheet) |
ATMEGA644PA-MU 44-vqfn (7x7 mm), exposed pad 핀 구성 가이드
ATMEGA644PA-MU(44-vqfn (7x7 mm), exposed pad 패키지)의 핀 구성입니다. 이 디지털 IC에는 GPIO, 통신 인터페이스(UART, SPI, I2C), 전원 핀이 포함되어 있습니다. 대체 핀 기능과 구성 옵션은 제조사 데이터시트를 참조하십시오. 임베디드 시스템 설계와 PCB 레이아웃에 필수적입니다.
다음에 대한 상세 핀아웃 데이터 없음: ATMEGA644PA-MU.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
ATMEGA644PA-MU 적합 용도: 6 애플리케이션s: Industrial Control and Automation, Battery-Powered Sensor and Data-Logging Nodes, Embedded Serial Communication Devices, Consumer Appliance Control Boards, Analog Sensing and Measurement Instruments, Motor Control and PWM Actuation Systems.
Industrial Control and Automation
The ATMEGA644PA-MU fits industrial control nodes because its 64 KB ISP Flash accommodates protocol stacks, state machines, and field-updatable firmware, while 4 KB SRAM supports buffering and multi-task control loops. Three timer/counters with compare modes and PWM drive actuators and motor control outputs directly, and the two USARTs connect to PLC backbones, HMI panels, or RS-485 transceivers. The 8-channel 10-bit ADC reads potentiometers, current shunts, and process sensors without external conversion silicon. Running at 20 MIPS, most control instructions execute in a single clock cycle for deterministic timing, and the fully static core tolerates wide clock ranges common on factory floors. Using the 44-VQFN footprint also allows migration to the 128 KB ATmega1284P-MU without PCB rework if application code grows.
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Battery-Powered Sensor and Data-Logging Nodes
For battery-operated monitoring products, the ATMEGA644PA-MU's picoPower technology minimizes average current: the real-time counter with its separate oscillator can wake the MCU from power-save mode on a timed schedule, sample the 8-channel 10-bit ADC, timestamp to EEPROM, and return to a low-power sleep state. The 64 KB Flash stores logging firmware, tables, and compression routines, and the 4 KB SRAM buffers records between radio or UART transmissions. Two USARTs allow simultaneous connection to a sensor bus and a wireless or cellular module. Because the PA suffix denotes the lowest-power ATmega644 revision, designs consuming microamps in sleep benefit directly; verify the exact sleep-current figures in the Microchip electrical characteristics for your supply voltage before finalizing the power budget.
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Embedded Serial Communication Devices
The ATMEGA644PA-MU is a strong fit for protocol converters, gateways, and communication adapters because it integrates two hardware USARTs plus a byte-oriented Two-Wire interface and SPI in one 44-pin device. A typical design bridges Modbus RTU on one USART to a proprietary two-wire bus on the other, while SPI drives an external EEPROM or display controller. The 64 KB ISP Flash with read-while-write lets the MCU reflash itself during field firmware updates without halting communication. Three timers generate baud-clock-independent PWM and timing references, and 32 GPIO lines handle flow control, addressing, and status signaling. The advanced RISC core delivers roughly 1 MIPS per MHz, so 20 MHz operation sustains wire-rate UART throughput at 115.2 kbaud with processing headroom.
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Consumer Appliance Control Boards
In appliance control boards - washers, HVAC controllers, cooktops, and small kitchen equipment - the ATMEGA644PA-MU provides the right memory-to-pin-count balance: 64 KB Flash holds UI logic, fault tables, and multilingual strings, while 32 GPIO lines drive buttons, LEDs, relays, and stepper or BLDC motor PWM channels via the three timer/counters. The 10-bit ADC reads temperature sensors (NTC), pressure inputs, and user potentiometers across 8 channels. PicoPower modes keep standby current low for always-plugged products meeting standby-power expectations. The 44-VQFN (7x7 mm) exposed-pad package suits compact two-layer or four-layer control PCBs, and family pin compatibility with ATmega324A/1284P lets one PCB layout serve multiple product tiers with different memory grades.
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Analog Sensing and Measurement Instruments
Handheld meters, environmental monitors, and portable test instruments benefit from the ATMEGA644PA-MU's combination of an 8-channel 10-bit ADC, 4 KB SRAM for waveform or sample buffering, and 64 KB Flash for calibration tables, linearization curves, and UI firmware. The real-time counter with separate oscillator maintains accurate time-stamping even when the main clock is stopped for power saving, and the on-chip 2-cycle hardware multiplier accelerates digital filtering and scaling math on the 8-bit core. Two USARTs output results to a PC, printer, or radio, while PWM channels drive piezo alerts and backlight control. Using the VQFN package keeps probe-sized instrument PCBs compact; the 44-pin footprint also supports the 128 KB ATmega1284P-MU for models requiring data-logging headroom.
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Motor Control and PWM Actuation Systems
The ATMEGA644PA-MU suits DC and stepper motor controllers because three flexible timer/counters with compare modes generate independent PWM channels with dead-time-adjustable compare outputs, while the 2-cycle hardware multiplier speeds PID loop math on the 8-bit core. The 10-bit ADC samples current shunts and position potentiometers across 8 channels for closed-loop control, and 32 GPIO lines handle limit switches, direction pins, and fault inputs. At 20 MIPS the core sustains multi-kHz control-loop rates with interrupt headroom. The 64 KB Flash stores commutation tables and multiple motion profiles, and the Two-Wire interface connects to an EEPROM or host controller. Designers should verify ADC sampling jitter and PWM resolution requirements against the datasheet timer section for the target motor topology.
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추천 제품 요약
엔지니어링 참조 데이터: ATMEGA644PA-MU — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ATMEGA644P-20MQ | ATMEGA644-20MU | ATMEGA324A-MU | ATMEGA1284P-MU |
|---|---|---|---|---|---|
| Package | 44-VQFN (7x7 mm) | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 64 KB | 32 KB | 128 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 2 KB | 16 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 1 KB | 4 KB |
| Max CPU Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| GPIO Count | 32 | 32 | 32 | 32 | 32 |
| Low Power Technology | picoPower (PA) | picoPower (P) | None (original die) | None (A die) | picoPower (P) |
주요 차별점
- picoPower die with lowest sleep currents in the 64 KB ATmega class (vs ATMEGA644-20MU)
- Twice the Flash and SRAM of the 324A in the identical 44-VQFN footprint (vs ATMEGA324A-MU)
- Cost-optimized mid-range position versus the 1284P (vs ATMEGA1284P-MU)
설계 노트
The 44-VQFN (7x7 mm) MU package has an exposed pad that must be soldered to a ground pour. Use an array of thermal vias under the pad to tie it to internal ground planes - this serves as the primary ground return and improves heat dissipation. For hand assembly or rework, the 0.5 mm pitch QFN lands require a stencil with approximately 70-80% aperture reduction on the pads and sufficient paste on the center pad. Follow IPC-7351 land-pattern calculations or Microchip's QFN layout guidelines in the packaging section of the data sheet.
Decouple VCC and AVCC separately: place a 100 nF ceramic capacitor within 5 mm of each VCC/AVCC pin pair, plus a bulk 4.7-10 uF capacitor near the device. AVCC should be connected to VCC through a low-pass LC filter (for example a 10 uH inductor and 100 nF capacitor) when ADC accuracy matters, keeping the digital return currents out of the analog reference. Connect AREF to a decoupled reference (internal reference with 100 nF on AREF, or an external precision reference). Estimated: at 5 V and full 20 MHz active current, an LDO-fed supply should be sized with margin for inrush during ISP programming.
Sleep-mode current on the ATmega644PA is only achieved when unused peripherals and clock sources are explicitly disabled before entering sleep - leave an ADC or the watchdog running and the picoPower advantage disappears. Also note that RESET can be reconfigured as a weak I/O pin via the fuse bits; accidentally disabling the external reset fuse makes in-system programming impossible without high-voltage parallel programming. When migrating from the ATmega324A or the non-PA ATmega644, re-verify the sleep-mode and Brown-out detector current figures against the PA electrical characteristics rather than reusing older design calculations.
Keep the XTAL1/XTAL2 crystal traces as short as possible (under 10 mm) and surround them with a ground guard ring; load capacitors should match the crystal specification, typically 12-22 pF depending on the crystal's CL. Route the SPI and USART signals away from the crystal and ADC input traces. For the Two-Wire interface, use external pull-ups sized per bus capacitance (approximately 4.7 kiloohm at 5 V for short buses) since the TWI pins do not provide strong internal pull-ups. These practices prevent clock jitter on the ADC and UART framing errors at 20 MHz operation.
규정 준수 정보
RoHS compliance and lead-free assembly are consistent with Microchip's standard product offering per the DigiKey/Microchip listings retrieved; REACH, halogen-free, and conflict-minerals statuses were not stated in the retrieved data and should be confirmed via Microchip's environmental page.