ATMEGA649V-8AUR - 8MHz AVR MCU 64KB Flash LCD | Microchip
MPN: ATMEGA649V-8AUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.62 | $7.62 |
| 10 | $6.85 | $68.50 |
| 100 | $6.1 | $610.00 |
| 500 | $5.45 | $2,725.00 |
| 1,000 | $4.88 | $4,880.00 |
ATMEGA649V-8AUR Overview
A microcontroller is a single-chip computer that integrates a processor core, program memory, data memory, and peripheral functions such as timers, UARTs, ADCs, and display drivers. The AVR family, originally developed by Atmel and now part of Microchip Technology, popularized the Harvard-architecture RISC design in which most instructions execute in a single clock cycle. Microcontrollers sit at the center of the embedded-system hierarchy, bridging bare logic ICs and full application processors, and are classified as 8-bit, 16-bit, or 32-bit depending on the datapath width.
Key features of the ATMEGA649V-8AUR include the integrated LCD controller supporting up to 132 segments (4x40), which is the defining feature of this ATmega649 variant, plus a JTAG interface for boundary-scan and on-chip debugging, 32 general-purpose working registers, and in-system self-programmable Flash. The V speed grade supports 1.8V to 5.5V operation at up to 8 MHz, making it suitable for battery-powered designs.
Architecturally, the AVR core executes most instructions in a single clock cycle, delivering up to 8 MIPS at 8 MHz. Read-while-write Flash allows firmware updates without halting execution. Peripherals typically include 8/16-bit timers, USART, SPI, TWI (I2C), a 10-bit ADC, and an analog comparator, together with the segment LCD driver that differentiates the 649 from the 640/644/645 family members.
Typical applications include battery-powered utility meters, panel meters with segment LCD displays, industrial handheld instruments, and low-power human-machine interfaces where an integrated LCD driver eliminates an external display controller.
When designing with this device, remember the V variant is limited to 8 MHz; the faster 16 MHz code requires the ATmega649A/649P family at 5V. Verify the LCD bias resistor network and contrast capacitor values against the manufacturer datasheet for the target panel configuration.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATMEGA649V-8AUR — 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-8AUR (same form factor and footprint) — differing in Package, LCD Controller, RoHS Status, Supply Voltage Range, General Purpose I/O.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA649A-AUR
✅ Drop-In✓ In Stock
$5.72 / Unit
View Datasheet →ATMEGA649A-MU
✅ Drop-In✓ In Stock
$4.42 / Unit
View Datasheet →ATMEGA649P-MU
✅ Drop-In✓ In Stock
$3.91 / Unit
View Datasheet →ATMEGA649P-MUR
✅ Drop-In✓ In Stock
$5.1 / Unit
View Datasheet →ATMEGA645A-AU
✅ Drop-In✓ In Stock
$3.95 / Unit
View Datasheet →ATMEGA6450V-8AU
✅ Drop-In✓ In Stock
$2.31 / Unit
View Datasheet →ATMEGA649V-8AUR Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Program Memory Size | 64KB (32K x 16) Flash |
| EEPROM Size | 2KB |
| SRAM Size | 4KB |
| Maximum Clock Frequency | 8 MHz |
| Supply Voltage Range | 1.8 V to 5.5 V |
| General Purpose I/O | 54 I/O lines |
| LCD Driver | Segment LCD controller (up to 4x40 / 132 segments per datasheet) |
| JTAG Interface | Yes (boundary-scan and on-chip debug) |
| Package | 64-TQFP (14x14 mm) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (R suffix) |
| RoHS Status | Compliant |
| Lifecycle Status | Active (newer device available: ATMEGA649A) |
ATMEGA649V-8AUR 64-tqfp (14x14 mm) Pin Configuration Guide
Pin configuration for ATMEGA649V-8AUR (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-8AUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA649V-8AUR is suitable for 6 applications: Battery-Powered Utility and Panel Meters, Industrial Handheld Instruments, Building Automation and HVAC Controllers, White Goods and Appliance User Interfaces, Low-Power Data Loggers, POS Terminals and Price Displays.
Battery-Powered Utility and Panel Meters
Utility meters, energy sub-meters, and industrial panel meters are the classic application for the ATMEGA649V-8AUR because the part combines a low-voltage 1.8V-5.5V AVR core with an on-chip segment LCD controller. The integrated LCD driver directly drives up to a 4x40 multiplexed glass, so no external display controller is needed, reducing BOM cost and board area. At 8 MHz the core delivers roughly 8 MIPS, ample for metering arithmetic and protocol stacks such as DLMS/Modbus. AVR sleep modes plus LCD operation allow multi-year battery life; designers should budget the LCD bias network and choose the V speed grade clock accordingly.
Recommended
Industrial Handheld Instruments
Handheld testers, calibrators, and process tools benefit from the ATMEGA649V-8AUR's combination of 64KB Flash with read-while-write capability, 2KB EEPROM for calibration storage, and 4KB SRAM for measurement buffering. The JTAG interface supports boundary-scan production testing and on-chip debugging through Microchip tooling, shortening development cycles. Running from 1.8V to 5.5V, the device can be powered directly from a lithium or NiMH pack. The segment LCD controller renders setpoints and readings without a graphic display cost penalty; the 8 MHz ceiling keeps current draw low during extended measurement sessions.
Recommended
Building Automation and HVAC Controllers
Room controllers, thermostats, and HVAC zone panels frequently need both a segment display and robust serial connectivity. The ATMEGA649V-8AUR provides the LCD driver for user interfaces and AVR USART/SPI/TWI peripherals for sensor buses and RS-485 transceiver links. The 54 general-purpose I/O lines cover relay outputs, valve drives, and keypads without port expanders. Flash read-while-write allows firmware field updates over the building network, and the 2KB EEPROM retains setpoint and schedule data through power loss. The 1.8V-5.5V range simplifies power-tree design in bus-powered sensors.
Recommended
White Goods and Appliance User Interfaces
Appliance control boards use the ATMEGA649V-8AUR to drive low-cost segment LCDs showing cycle status, temperature, and timers while scanning membrane keypads and driving loads through the 54 I/O lines. The AVR RISC core executes most instructions in one clock cycle, giving responsive UI behavior at a low 8 MHz clock, which reduces radiated emissions for EMC-heavy appliance environments. Flash self-programming supports late-stage feature changes without hardware revision, and EEPROM endures repeated user-setting writes across the appliance lifetime. Supply operation down to 1.8V supports capacitor-dropper supplies in some designs.
Recommended
Low-Power Data Loggers
Standalone data loggers recording temperature, pressure, or energy data exploit the ATMEGA649V-8AUR's 4KB SRAM for sample buffers and 2KB EEPROM for configuration and index data, with 64KB Flash holding both firmware and logged constants. Sleep modes between samples and the modest 8 MHz clock minimize average current; the device can be woken periodically by a watchdog or timer to sample, compute, and store. The integrated LCD can display status without adding a driver IC. At 1.8V operation the part runs from a single lithium cell, and the JTAG port simplifies bring-up and regression testing.
Recommended
POS Terminals and Price Displays
Electronic shelf labels, price displays, and simple point-of-sale terminals use the ATMEGA649V-8AUR's LCD controller for static or multiplexed character displays while handling barcode-scanner and host communication through the USART and TWI interfaces. The 54 I/O lines support keypad matrices and tactile feedback devices, and the AVR core's single-cycle execution keeps scan and debounce latency low. Flash read-while-write enables pricing-table updates in the field, and the 64KB program space accommodates multi-language string tables. The 1.8V-5.5V range supports coin-cell or rechargeable-pack powered label hardware.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA649V-8AUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA649A-AUR | ATMEGA649A-MU | ATMEGA649P-MU | ATMEGA645A-AU | ATMEGA6450V-8AU |
|---|---|---|---|---|---|---|
| Package | 64-TQFP (14x14 mm) | 64-TQFP (14x14 mm) - same | 64-VQFN | 64-VQFN | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Flash | 64KB | 64KB | 64KB | 64KB | 64KB | 64KB |
| Max Clock Frequency | 8 MHz | 20 MHz | 20 MHz | 20 MHz | 16-20 MHz (speed grade dependent) | 8 MHz |
| LCD Controller | Yes (segment LCD) | Yes (segment LCD) | Yes (segment LCD) | Yes (segment LCD) | No | No |
| SRAM | 4KB | 4KB | 4KB | 4KB | 4KB | 4KB |
| Generation | Original ATmega649V (picoPower era predecessor) | Newer die (recommended replacement) | Newer die | picoPower generation | A generation (no LCD) | V generation (no LCD) |
Key Differentiators
- Integrated segment LCD controller (vs ATMEGA645A-AU)
- Wide 1.8V-5.5V low-voltage operation (vs ATMEGA649A-AUR)
- Lower cost on legacy pricing (vs ATMEGA649P-MU)
Design Notes
The ATMEGA649V-8AUR V speed grade is limited to 8 MHz across the full 1.8V-5.5V range. Do not clock it above 8 MHz; designs needing faster execution should migrate to the ATMEGA649A-AUR drop-in. For battery designs, exploit AVR power-down sleep with only the LCD controller and an asynchronous timer active, and estimate average current from datasheet active/sleep figures rather than assuming the 8 MHz active current applies continuously.
When swapping to the 649A or 649P successors, review register-level differences and errata before reusing firmware - although pin maps are compatible, peripheral bases and EEPROM behavior can differ between generations. Also confirm the R suffix ordering: ATMEGA649V-8AUR ships in Tape & Reel for automated assembly; the tray-packaged ATMEGA649V-8AU suits prototype hand-placement.
Place 100 nF decoupling capacitors at each VCC/AVCC pin pair of the 64-TQFP as close to the pins as possible, and connect the LCD bias capacitors directly at the specified capacitor pins of the glass to keep segment drive waveforms clean. Use a solid ground plane under the device to reduce ground bounce from simultaneously switching I/O lines driving the LCD and relays. Route JTAG (TDI/TMS/TCK/TDO) as a short, matched group for reliable debug during development.
Compliance Information
RoHS compliance and lead-free status per DigiKey/Mouser product listings. REACH, halogen-free, and conflict-minerals declarations not present in the retrieved data.
