ATMEGA649V-8AI - 8MHz AVR MCU 64KB Flash LCD | Microchip
MPN: ATMEGA649V-8AI ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.85 | $7.85 |
| 10 | $7.1 | $71.00 |
| 100 | $6.45 | $645.00 |
| 500 | $5.9 | $2,950.00 |
| 1,000 | $5.4 | $5,400.00 |
ATMEGA649V-8AI Overview
An 8-bit AVR microcontroller is a Harvard-architecture processor that executes most of its 130 powerful instructions in a single clock cycle, sitting within the broader microcontroller hierarchy of MCU -> embedded processor -> integrated circuit. Microcontrollers like the ATMEGA649V combine CPU, memory, and peripherals on one die, making them the backbone of cost-sensitive embedded systems that must sense, compute, drive displays, and communicate without external components.
Key differentiating features include the on-chip LCD driver with up to 4x40 segment driving capability, read-while-write self-programming Flash for field firmware updates, 54 general-purpose I/O lines, and a rich analog and timer peripheral set including an 8-channel 10-bit ADC, two 8-bit and two 16-bit timers, and a JTAG interface for on-chip debugging and boundary scan. The low-voltage V-grade operation down to 1.8V supports battery-powered designs.
The AVR advanced RISC architecture provides 32 general-purpose working registers directly connected to the ALU, delivering up to 8 MIPS throughput at the maximum 8 MHz clock. In-System Programmable (ISP) Flash via the SPI interface, together with ICSP support using tools such as the MPLAB SNAP, enables in-circuit reprogramming without removing the device from the board.
Typical applications include battery-powered instrumentation with LCD displays, utility metering, handheld industrial terminals, HVAC control panels, and low-power sensor nodes - all cases where the integrated segment LCD driver and 1.8V operation eliminate external display circuitry and extend battery life.
When designing with this part, note that maximum clock frequency scales with supply voltage: the 8 MHz rating applies across the full 1.8V to 5.5V range for this V-grade device, but system designers should verify ADC reference and timing budgets at the low end of the supply range.
This page synthesizes distributor inventory data, pin-compatible drop-in alternatives, and practical design notes beyond what the manufacturer datasheet alone provides.
Drop-in alternatives for ATMEGA649V-8AI — 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 ATMEGA649V-8AI (same form factor and footprint) — differing in ADC, LCD Controller, Package, General Purpose I/O, JTAG Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA649A-AUR
✅ Drop-In✓ In Stock
$5.72 / Unit
View Datasheet →ATMEGA649V-8AUR
✅ Drop-In✓ In Stock
$4.88 / Unit
View Datasheet →ATMEGA649V-8AU
✅ Drop-In✓ In Stock
$7.28 / Unit
View Datasheet →ATMEGA645-16AI
✅ Drop-In✓ In Stock
$6.45 / Unit
View Datasheet →ATMEGA329V-8AI
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.45 / Unit
View Datasheet →ATMEGA649V-8AI Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR 8-bit RISC |
| Max CPU Clock | 8 MHz |
| Flash Program Memory | 64 KB (32K x 16) |
| EEPROM | 2 KB |
| SRAM | 4 KB |
| Operating Voltage Range | 1.8 V to 5.5 V |
| General Purpose I/O | 54 I/O lines |
| LCD Controller | Integrated segment LCD driver |
| ADC | 10-bit |
| Timers/Counters | Two 8-bit, two 16-bit |
| Package | 64-TQFP (14x14 mm) |
| Mounting Type | Surface Mount |
| Temperature Grade | Industrial (-40C to +85C) |
| Programming Interface | ISP / ICSP via SPI, JTAG for debug |
| Instructions | 130 instructions, most single-cycle |
| Working Registers | 32 general purpose |
ATMEGA649V-8AI 64-tqfp (14x14 mm) Pin Configuration Guide
Pin configuration for ATMEGA649V-8AI (64-tqfp (14x14 mm) 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 ATMEGA649V-8AI.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA649V-8AI is suitable for 6 applications: Utility Metering, Handheld Industrial Terminals, HVAC Control Panels, Low-Power Sensor Nodes, Medical Monitoring Devices, Appliance User Interface Boards.
Utility Metering
The ATMEGA649V-8AI fits electricity, water, and gas meter front-ends because its integrated segment LCD driver directly drives the meter display while the 10-bit ADC digitizes sensor inputs - all from a single 1.8V to 5.5V supply that tolerates battery sag without browning out. The 64 KB self-programming Flash supports read-while-write firmware updates in the field, so tariff tables or calibration data can be revised without recall. With 54 general-purpose I/O lines, keypad scanning, valve or relay control, and communication transceiver handshaking all attach without port expanders. Placed at the center of the meter PCB with the LCD common and segment lines routed on a dedicated layer, the device consolidates metering, display, and control functions that would otherwise require a separate LCD controller IC.
Recommended
Handheld Industrial Terminals
Battery-powered handheld terminals benefit from the ATMEGA649V-8AI's combination of low-voltage operation and on-chip LCD driving: the V-grade 1.8V minimum supply extends cell life, while the segment LCD controller eliminates an external display driver, reducing both cost and quiescent drain. The AVR architecture delivers most of its 130 instructions in a single clock cycle, so up to 8 MIPS at 8 MHz is sufficient for menu handling, barcode data formatting, and protocol conversion. The 4 KB SRAM holds frame buffers and communication buffers, and JTAG enables on-chip debugging during development. Because the device operates reliably at -40C to +85C, terminals stored in vehicles or used on factory floors maintain display and logic function across the full industrial temperature envelope without derating.
Recommended
HVAC Control Panels
Building climate-control panels require a display, keypad input, and actuator control - precisely the mix the ATMEGA649V-8AI addresses with its LCD driver, 54 I/O lines, and four timers. The two 16-bit timers generate PWM outputs for damper motors and fan speed control with hardware timing that is independent of software load, while the 10-bit ADC reads temperature sensors such as NTC thermistors across the panel. Operation from 1.8V to 5.5V means one firmware image serves both battery-backup configurations and mains-derived 5V rails. The 64 KB Flash accommodates modulation algorithms, schedule tables, and communication stacks simultaneously, and the industrial -40C to +85C rating covers rooftop and mechanical-room installations where ambient extremes exceed consumer-grade limits.
Recommended
Low-Power Sensor Nodes
Distributed sensor nodes exploit the ATMEGA649V-8AI's AVR power-down and power-save modes between measurement cycles: the MCU sleeps at microamp-level current and wakes on timer or external interrupt to sample the 10-bit ADC, process the reading, and update the segment LCD. The 1.8V floor allows operation directly from two NiMH cells or a single lithium cell through a simple LDO. The 2 KB EEPROM stores calibration coefficients that survive battery replacement, and the SPI interface streams data to a radio module or SD card. In a typical node, the device spends over 99% of its duty cycle asleep, so the 8 MHz active performance is used in short bursts, balancing responsiveness with multi-year battery life targets in environmental and agricultural monitoring deployments.
Recommended
Medical Monitoring Devices
Portable medical monitors such as glucose meters and vital-sign recorders use the ATMEGA649V-8AI's LCD driver for the primary patient interface and its 10-bit ADC for sensor acquisition, consolidating the measurement chain on one industrial-grade die. The 1.8V to 5.5V supply range allows operation from a single-cell lithium battery with minimal regulation loss, important for wearable form factors. The 64 KB Flash holds signal-filtering routines, patient data logs in the 4 KB SRAM, and a boot loader supporting firmware integrity updates via the read-while-write self-programming feature. JTAG boundary scan supports production test of the dense TQFP-64 assembly, and the deterministic single-cycle RISC core simplifies timing analysis for measurement sampling loops required by regulatory design documentation.
Recommended
Appliance User Interface Boards
White-goods and appliance control panels pair a segment LCD with keypad scanning and actuator driving - workload handled natively by the ATMEGA649V-8AI's LCD controller, 54 I/O lines, and hardware timers. The 8 MHz maximum clock is fully adequate for UI responsiveness, recipes, and error-code displays, while the industrial temperature rating tolerates kitchen and laundry-room heat near -40C to +85C extremes. The 2 KB EEPROM retains user preferences and cycle counters across power cycles, and in-system programming through the SPI-based ICSP interface lets manufacturers flash final firmware on the assembled production line without removing the TQFP-64 device. The self-programming Flash further enables connected-appliance OTA-style updates through an external communication module.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA649V-8AI — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA649A-AUR | ATMEGA649V-8AUR | ATMEGA645-16AI | ATMEGA329V-8AI |
|---|---|---|---|---|---|
| Package | 64-TQFP (14x14 mm) | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB | 32 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB | 2 KB |
| LCD Driver | Yes (integrated) | Yes (integrated) | Yes (integrated) | Yes (integrated) | Yes (integrated) |
| Temperature Range | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) |
| Die Revision | Original V-grade die | A-revision (newer) | V-grade die | 645 die (LCD family) | 329 die (smaller Flash) |
Key Differentiators
- Integrated segment LCD controller (vs ATMEGA644P-20PQ)
- Double the memory of the small LCD variant (vs ATMEGA329V-8AI)
- Full-bandwidth low-voltage operation (vs ATMEGA645-16AI)
Design Notes
Design the supply for the 1.8V to 5.5V envelope but verify the brown-out detector (BOD) threshold against your battery discharge curve. If the system runs from two alkaline cells (3.0V nominal, down to ~1.8V end-of-life), enable BOD at the lowest available threshold so the MCU does not reset prematurely, and use the power-down mode between UI updates. Estimated: a node sleeping 99% of the time at microamp-level sleep current versus several mA active at 8 MHz gains roughly two orders of magnitude average-current reduction.
Route the LCD segment and common lines away from the ADC input traces and the crystal; LCD drive signals are AC-coupled square waves that couple capacitively into high-impedance analog nodes. Use a solid ground plane under the 64-TQFP, decouple VCC and AVCC with 100 nF ceramics placed within 2 mm of the pins, and keep the JTAG header footprint on the board even if unpopulated in production - it preserves in-circuit debug and boundary-scan test access.
Do not assume pin-to-pin compatibility without checking the datasheet pin configuration table: family members like the ATMEGA6490V use a 100-pin package with a different pin map, and A-revision die changes can alter fuse defaults. When migrating firmware from the ATmega64 to the ATmega649, the LCD controller must be explicitly initialized and its drive timing configured; forgetting LCD bias resistor sizing is the most common first-revision display-contrast failure.
Compliance Information
Compliance status not stated in the provided verified web data; confirm RoHS/REACH status on the Microchip product page or via distributor certificate of conformance before ordering.
