ATMEGA644PV-10MQ - 8-Bit AVR MCU 64KB Flash 10MHz | Microchip
MPN: ATMEGA644PV-10MQ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
ATMEGA644PV-10MQ Overview
An 8-bit microcontroller is an integrated circuit that combines a processor core, memory, and peripherals on a single chip to perform dedicated control tasks. The ATmega644PV-10MQ belongs to the AVR enhanced RISC family within the broader hierarchy of microcontrollers under embedded processors. AVR cores execute most instructions in a single clock cycle, achieving throughput close to 1 MIPS per MHz, which lets designers trade clock speed for lower power consumption.
Key features include in-system self-programmable Flash via SPI, On-chip Boot code support, picoPower technology for battery-friendly sleep currents, and two full-duplex USARTs (the P suffix denotes the dual-UART variant of the ATmega644 family). The wide 1.8V to 5.5V operating range supports both single-cell battery systems and 5V industrial rails without a regulator change.
Architecturally, the device is manufactured in Atmel/Microchip high-density nonvolatile memory technology. The on-chip ISP Flash allows reprogramming in-system through the SPI serial interface, by a conventional programmer, or by boot code running on the AVR core, simplifying field upgrades.
Typical applications include battery-powered sensor nodes, industrial control panels and HMI boards, and energy or utility metering where the wide supply range and picoPower sleep modes extend battery life.
Design consideration: at 5.5V the maximum rated speed of 10MHz limits overclocking headroom, so verify timing margins if you migrate code from 20MHz ATmega644P variants.
This page synthesizes distributor availability, drop-in alternatives, and design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATMEGA644PV-10MQ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATMEGA644PV-10MQ (same form factor and footprint) — differing in Core Architecture, EEPROM, SRAM, Package, Flash Memory.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
No drop-in alternatives available for this product.
Request AlternativesATMEGA644PV-10MQ Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR 8-bit enhanced RISC |
| Flash Memory | 64KB (32K x 16) |
| SRAM | 4KB (4K x 8) |
| EEPROM | 2KB |
| Maximum CPU Speed | 10 MHz |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Package | 44-VQFN (7x7 mm) exposed pad |
| Mounting Type | Surface Mount |
| Series | AVR ATmega (ATmega644P, picoPower) |
| USART Count | 2 |
| Temperature Grade | Extended temperature |
| Green / RoHS Status | Green (RoHS compliant) |
ATMEGA644PV-10MQ 44-vqfn (7x7 mm) exposed pad Pin Configuration Guide
Pin configuration for ATMEGA644PV-10MQ (44-vqfn (7x7 mm) exposed pad package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATMEGA644PV-10MQ.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA644PV-10MQ is suitable for 6 applications: Industrial Sensor and Control Nodes, Battery-Powered Metering and Logging, Embedded HMI and Control Panels, Building Automation and HVAC Controllers, Educational and Embedded Development Platforms, Consumer Appliance Control Boards.
Industrial Sensor and Control Nodes
The ATMEGA644PV-10MQ fits industrial control nodes because its 1.8V to 5.5V supply range tolerates noisy 5V rails and its extended temperature grading covers harsh factory environments. Two full-duplex USARTs allow a dual-channel design: one UART runs RS-485 Modbus RTU to the SCADA network while the second services a local display or debug console. The 64KB Flash holds protocol stacks, calibration tables, and a boot loader for field firmware updates through the on-chip ISP interface, and the 4KB SRAM buffers sensor samples. The 10MHz rating provides roughly 10 MIPS of throughput per the AVR 1 MIPS/MHz architecture, sufficient for PID loops and Modbus CRC handling. Place the 44-VQFN exposed pad on a solid ground pour for EMC compliance in electrically noisy cabinets.
Recommended
Battery-Powered Metering and Logging
Utility meters, dataloggers, and hand-held instruments benefit from the ATMEGA644PV-10MQ's picoPower technology and wide voltage range. Running directly from two alkaline cells (approximately 1.8V to 3.0V), the MCU operates below 10MHz without needing a regulator, and picoPower sleep modes extend shelf life between wake-up events. The 2KB EEPROM stores accumulated consumption values and calibration constants that must survive power loss without external nonvolatile memory. The 64KB Flash accommodates multi-tariff logic and communication firmware, while the dual USARTs separate an optical or RF metering bus from a service UART. Because AVR current scales with clock, staying at 10MHz rather than a 20MHz variant measurably reduces average consumption in duty-cycled systems.
Recommended
Embedded HMI and Control Panels
Machine front panels, keypad controllers, and small HMI boards are a natural fit for the ATMEGA644PV-10MQ. Its 32 general-purpose I/O lines drive multiplexed keypads, LEDs, and small character LCDs directly, while the 64KB Flash holds fonts, menu trees, and localization strings that would overflow smaller ATmega parts. The dual USARTs allow one channel to carry a firmware-update or telemetry link while the other talks to an RS-232 or RS-485 backplane. The 44-VQFN (7x7 mm) exposed-pad package gives a compact footprint for dense panel PCBs, and the extended temperature grade suits enclosures that heat up under sunlight or near machinery. On-chip ISP lets production program boards in-circuit after final assembly.
Recommended
Building Automation and HVAC Controllers
Dampers, valves, and room controllers in building automation run continuously for years, making the ATMEGA644PV-10MQ's low sleep current and robust 5V operation valuable. A typical partition assigns one USART to a BACnet-compatible or proprietary RS-485 trunk and the second to a service port. The 4KB SRAM buffers multiple sensor channels (temperature, humidity, CO2) sampled by the on-chip ADC, and the 64KB Flash holds control schedules and a boot loader for remote firmware updates. The extended temperature rating covers plenum and rooftop equipment environments. Design the 44-VQFN land pattern with the exposed pad soldered to ground to improve thermal relief in sealed controllers, and keep the ISP header populated for commissioning.
Recommended
Educational and Embedded Development Platforms
The ATmega644 family is popular in university courses and open-hardware platforms because the AVR instruction set is well documented and the device offers generous 64KB Flash for complex example projects without managing external memory. The ATMEGA644PV-10MQ's 10MHz clock keeps designs simple - many boards use a low-cost crystal or even the internal RC oscillator - while the 44-VQFN package teaches modern QFN assembly skills on production-style boards. On-chip ISP and boot-loader support mean students can program boards through a single SPI header using free toolchains such as AVR-GCC and avrdude. The dual USARTs let one channel serve as a debug console while the other demonstrates serial protocol laboratories.
Recommended
Consumer Appliance Control Boards
White-goods and small-appliance controllers need low unit cost, proven reliability, and field-upgradable firmware, all of which the ATMEGA644PV-10MQ delivers. The Green, lead-free 44-VQFN package meets consumer environmental requirements, and the wide 1.8V to 5.5V operating range simplifies power-supply design across mains-derived supplies. The 64KB Flash supports menu-driven UIs, fault logging, and multiple language packs; the 2KB EEPROM preserves user settings and usage counters across power cycles. Dual USARTs handle a user-interface expansion link and a separate service or Wi-Fi module interface. The 10MHz rating limits EMI compared with faster variants, easing EMC pre-compliance in cost-sensitive consumer enclosures.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA644PV-10MQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA644P-20MQ | ATMEGA644PA-MU | ATMEGA1284P-MU |
|---|---|---|---|---|
| Package | 44-VQFN (7x7) exposed pad | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology |
| Max CPU Speed | 10 MHz | 20 MHz | 20 MHz | 20 MHz |
| Flash Memory | 64KB | 64KB | 64KB | 128KB |
| SRAM | 4KB | 4KB | 4KB | 16KB |
| EEPROM | 2KB | 2KB | 2KB | 4KB |
| USART Count | 2 | 2 | 2 | 2 |
| Pin Compatibility | Base 44-VQFN ATmega644 pinout | Pin-to-pin compatible | Pin-to-pin compatible | Pin-to-pin compatible |
Key Differentiators
- Lowest-cost speed grade in the pin-compatible family (vs ATMEGA644P-20MQ)
- Wide low-voltage operation across full speed rating (vs ATMEGA644P-20MQ)
- In-place memory upgrade path (vs ATMEGA1284P-MU)
Design Notes
The 44-VQFN (7x7) package requires an exposed-pad land pattern with a solderable ground area under the die. Per Microchip QFN layout guidance, tile the exposed-pad region with vias (typically 4-9) to a ground plane for reliable solder wicking and grounding. QFN pads are bottom-side only: reflow, hot air, or vapor-phase soldering is required; hand-soldering with an iron alone is not feasible. Inspect with X-ray or angle-view AOI because perimeter fillets are the only visible solder.
Decouple VCC and AVCC separately with 100 nF ceramics placed within 5 mm of the respective pins, plus one bulk 4.7-10 uF per rail. The picoPower V-graded part reaches its lowest sleep current only when unused peripherals are disabled and pull-ups are managed in software; review the 'Sleep Modes' chapter of the ATmega644P datasheet when targeting battery operation. If AVCC powers the ADC, add an LC or RC filter from the digital rail to reduce ADC noise.
Do not assume the 20MHz firmware timing of ATMEGA644P-20MQ designs carries over unchanged: the ATMEGA644PV-10MQ is limited to 10MHz, so recalculate UART baud divisors, SPI clock prescalers, and delay libraries. Verify fuse settings (CKSEL, SUT, BOOTRST) during programming - incorrect CKSEL fuses on QFN parts with no external crystal will brick the board in-circuit. Reserve the SPI ISP header on the PCB even for production boards to allow rework and field updates.
Compliance Information
Listed as 'Green' in distributor data (FindIC), which denotes Microchip's lead-free/RoHS-compliant construction. REACH, halogen-free, and conflict-minerals declarations not stated in the provided data and should be confirmed on the Microchip product page.