ATMEGA644PA-MNR - 8-bit AVR MCU 64KB Flash 20MHz | Microchip
Référence : ATMEGA644PA-MNR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $2.42 | $2,42 |
| 10 | $2.3 | $23,00 |
| 100 | $2.1 | $210,00 |
| 500 | $1.95 | $975,00 |
| 1 000 | $1.8 | $1 800,00 |
ATMEGA644PA-MNR Présentation
An 8-bit AVR microcontroller is a single-chip processor based on the AVR enhanced RISC architecture, in which most of the 131 powerful instructions execute in a single clock cycle. This gives the ATmega family a throughput approaching 1 MIPS per MHz, allowing system designers to optimize power consumption versus processing speed. Within the embedded processing hierarchy, the ATmega644PA sits in the general-purpose flash MCU class alongside the ATmega164A/324A/1284 family members, all sharing a common core and peripheral set.
Key features of the ATMEGA644PA-MNR include read-while-write Flash for reliable in-system self-programming, Microchip's picoPower technology for ultra-low sleep-mode consumption, an internal oscillator that removes the need for an external crystal in many designs, and a rich peripheral set with JTAG for on-chip debugging and boundary scan. The PA suffix denotes the picoPower, low-voltage grade supporting operation down to 1.8 V.
Architecturally, the device combines 32 general purpose working registers directly connected to the ALU, allowing two independent registers to be accessed in one instruction, plus hardware multiplier and multiple sleep modes. In-system programmable Flash and support for ICSP via two I/O pins and reset (compatible with MPLAB SNAP and Atmel-ICE tools) simplify manufacturing and field updates.
Typical applications include industrial control and automation nodes, sensor acquisition systems, battery-powered portable instruments, and embedded HVAC or building-control boards, where 64 KB of program memory and low active power per MHz are decisive.
For design, note that the VQFN exposed pad should be soldered to a ground plane for thermal and signal integrity, and Mouser lists a 105C temperature grade variant so confirm the exact suffix grade against the datasheet.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.
Alternatives de remplacement direct pour ATMEGA644PA-MNR — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ATMEGA644PA-MNR (même facteur de forme et même empreinte) — différant par EEPROM, SRAM, Flash Memory, RoHS Status, Package.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA644P-20MQ
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$2.48 / unité
Voir la fiche technique →ATMEGA644PA-MU
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$3.78 / unité
Voir la fiche technique →ATMEGA1284P-MU
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$4.1 / unité
Voir la fiche technique →ATMEGA1284PA-MU
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ATMEGA324PA-MU
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$2.05 / unité
Voir la fiche technique →ATMEGA644PA-MNR Valeurs maximales et caractéristiques électriques
| Core | AVR 8-bit RISC |
| Program Memory Size | 64 KB (32K x 16) Flash |
| Program Memory Type | ISP FLASH, read-while-write |
| EEPROM Size | 2 KB |
| SRAM Size | 4 KB (4K x 8) |
| CPU Speed | 20 MHz |
| Number of I/O | 32 |
| General Purpose Working Registers | 32 |
| Instructions | 131, mostly single-clock cycle |
| Oscillator Type | Internal |
| Boîtier / Format | 44-VQFN (7x7 mm) Exposed Pad |
| Type de montage | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Programming / Debug | ICSP, JTAG |
| Technology Feature | picoPower low-power technology |
Guide de configuration des broches du ATMEGA644PA-MNR 44-vqfn (7x7 mm) exposed pad
Configuration des broches du ATMEGA644PA-MNR (boîtier 44-vqfn (7x7 mm) exposed pad). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour ATMEGA644PA-MNR.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ATMEGA644PA-MNR convient pour 6 applications: Industrial Control and Automation, Battery-Powered Sensor Nodes, HVAC and Building Control Boards, Portable Test and Measurement Instruments, Consumer Appliance Control, Robotics and Hobby / Educational Platforms.
Industrial Control and Automation
The ATMEGA644PA-MNR fits factory automation nodes where deterministic 8-bit control, 64 KB of self-programmable Flash for protocol stacks, and 32 GPIO for relay and sensor interfacing are required. Its single-cycle instruction execution at 20 MHz provides approximately 20 MIPS of headroom for Modbus or CAN-adjacent firmware, while the 4 KB SRAM buffers telemetry frames. The JTAG interface enables boundary-scan production test and on-chip debugging on the assembly line. Because the AVR executes from Flash with read-while-write support, field firmware updates over the production network are feasible without a bootloader chip. Place the exposed pad on a solid ground plane and use the internal oscillator with an external crystal only where timing accuracy below +/-2% is needed.
Recommandé
Battery-Powered Sensor Nodes
The picoPower ATmega644PA is engineered for battery-operated data loggers and wireless sensor endpoints. Its multiple sleep modes, including power-down and power-save, allow the MCU to idle at microamp-scale current between wake events, while the PA low-voltage grade supports operation from single-cell or two-cell battery stacks. The internal oscillator eliminates the always-on crystal current for non-timing-critical tasks, and the 2 KB EEPROM stores calibration constants across power cycles. Designers should drive unused GPIO as outputs low, disable the digital input buffers on analog pins, and schedule ADC sampling bursts from the power-save timer to minimize average draw. At 1 MIPS per MHz efficiency, short active bursts complete quickly, further extending battery life in multi-year deployments.
Recommandé
HVAC and Building Control Boards
Building automation controllers benefit from the ATMEGA644PA-MNR's balance of program memory and I/O. Sixty-four KB of Flash accommodates PID control loops, communication stacks, and OTA-style field update code, while 32 GPIO directly drive damper actuators, triacs, and status LEDs through simple driver stages. The 10-bit ADC peripheral reads temperature sensors such as NTC networks, and hardware timers generate PWM for fan speed control. The 105C temperature grade offered in the family supports hot attic or rooftop enclosures when the correct suffix grade is ordered. Use the JTAG port during development to step through control code, and reserve the EEPROM for setpoint persistence across power outages. Costs stay low because no external memory expansion is required.
Recommandé
Portable Test and Measurement Instruments
Handheld meters and bench accessories use the ATMEGA644PA-MNR for its 10-bit ADC, generous Flash for calibration and UI firmware, and low active power. The 4 KB SRAM holds rolling measurement buffers and a small menu-driven graphics state machine, while 64 KB Flash stores multi-language strings and calibration tables in place. The device's 20 MHz capability gives responsive button handling and display refresh, and the picoPower sleep modes let the instrument auto-power-down between measurements, extending battery intervals in field service tools. Designers should dedicate a timer to ADC sampling for jitter-free triggering and use the EEPROM for last-calibration date tracking. The 7x7 mm VQFN keeps the board compact enough for ergonomic handheld enclosures.
Recommandé
Consumer Appliance Control
Appliance mainboards - coffee machines, small ovens, and fans - use the ATMEGA644PA-MNR to run UI, safety interlock, and actuator control in one low-cost 8-bit MCU. The internal oscillator reduces bill-of-material cost, and 131 single-cycle instructions simplify cycle-accurate triac phase control for heater power regulation. Sixty-four KB of Flash leaves room for feature-rich menus and fault-logging code, while the EEPROM persists user preferences. Hardware TWI and UART peripherals interface display drivers and external EEPROM without bit-banging overhead. The robust AVR I/O structure with internal pull-ups simplifies key-matrix scanning. For mains-adjacent designs, isolate the MCU supply properly and keep high-voltage creepage distances away from the 7x7 mm VQFN sensing inputs.
Recommandé
Robotics and Hobby / Educational Platforms
The ATmega644PA is a popular core for robot controllers and educational boards because Arduino-compatible toolchains, bootloaders, and community libraries target the AVR family. The ATMEGA644PA-MNR's 32 GPIO drive dual H-bridge direction signals, encoder inputs, and servo PWM simultaneously, while 64 KB Flash hosts navigation code plus a bootloader for USB or UART field updates. Four KB of SRAM accommodates kinematics math and sensor fusion buffers that overflow smaller ATmega328-class devices. The 20 MIPS throughput handles closed-loop motor control at 1 kHz update rates with margin. Educational users benefit from ICSP programming with MPLAB SNAP and the extensive AVR documentation set, making this a strong step-up part from ATmega328-based starter boards.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA644PA-MNR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATMEGA644P-20MQ | ATMEGA644PA-MU | ATMEGA1284P-MU | ATMEGA324PA-MU |
|---|---|---|---|---|---|
| Package | 44-VQFN (7x7) Exposed Pad | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 64 KB | 128 KB | 32 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 16 KB | 2 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 4 KB | 1 KB |
| Max CPU Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| GPIO Count | 32 | 32 | 32 | 32 | 32 |
| picoPower Low-Power Grade | Yes | No | Yes | No | Yes |
Principaux différenciateurs
- picoPower low-power technology (vs ATMEGA644P-20MQ)
- Cost-optimized memory point vs 128 KB (vs ATMEGA1284P-MU)
- Double the code space of the 324 (vs ATMEGA324PA-MU)
Notes de conception
Solder the VQFN exposed pad to a grounded copper pour with an array of thermal vias. The exposed pad is the primary ground return for the die; relying only on the perimeter ground pads increases ground bounce and degrades ADC accuracy. Use a 4x4 via array (0.3 mm drill) under the pad and inspect with X-ray or a stencil-applied paste percentage check (60-80% coverage) during production qualification to avoid voiding on this 7x7 mm package.
Decouple VCC and AVCC independently with 100 nF ceramic capacitors placed within 3 mm of each pin pair, plus a bulk 4.7-10 uF per rail. Connect AVCC to VCC through a low-pass LC filter when ADC accuracy matters, and never let AVCC float even if the ADC is unused, per the Microchip datasheet connection guidelines. When the internal oscillator is used, keep the XTAL1 pin from picking up digital switching noise by routing it away from PWM and UART lines.
Ordering-code confusion is the most common sourcing pitfall in this family: suffixes encode package (M = VQFN/MLF 44), voltage/temperature grade, and packaging (R = tape and reel). Verify that any substitute (for example, swapping NR and MU suffixes, or the non-picoPower 644P for the 644PA) matches your required voltage range and sleep-mode current budget before releasing the BOM. Also confirm the JTAG enable fuse state, since JTAG pins double as Port C I/O.
Informations de conformité
RoHS-compliant, lead-free surface-mount production part per authorized distributor listings (DigiKey, Mouser, LCSC). REACH, halogen-free, and conflict-minerals status should be confirmed via Microchip material declarations for the specific date code.