ATMEGA6490V-8AI - 8-Bit AVR MCU, 64KB Flash, 8MHz | Microchip
MPN: ATMEGA6490V-8AI ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.85 | $9.85 |
| 10 | $8.95 | $89.50 |
| 100 | $7.9 | $790.00 |
| 500 | $7.15 | $3,575.00 |
| 1,000 | $6.45 | $6,450.00 |
ATMEGA6490V-8AI Overview
A microcontroller (MCU) is a single-chip embedded computer that integrates a processor core, program memory, data memory, and peripherals such as timers, UARTs, and ADCs. Within the embedded system hierarchy, the ATmega6490V belongs to the AVR ATmega family of 8-bit MCUs, sitting in the large-memory, large-pin-count, LCD-capable tier used in human-interface equipment.
Key features include an advanced RISC architecture with 130 mostly single-cycle instructions, read-while-write self-programming Flash, 54/69 general-purpose I/O lines, and an on-chip LCD driver that can drive up to 160 segment pixels, which eliminates an external LCD controller in metering and display applications. The picoPower technology provides low active and sleep current consumption for battery-powered designs.
Technically, the device pairs the AVR core with 32 general-purpose working registers, a hardware multiplier, JTAG (debugWIRE/ICE support via JTAG on this family), and rich peripherals including USARTs, SPI, timers with PWM, and an analog comparator, making it suitable for firmware that combines UI rendering with measurement tasks.
Typical applications include utility metering, LCD-based industrial panels, HVAC controllers, and battery-operated handheld instruments where a low-voltage supply (down to 1.8V) and integrated segment LCD drive reduce system cost.
A key design consideration: the V-speed-grade device is limited to 8 MHz and, at supply voltages below 2.7V, safe operating frequency may be further constrained per the datasheet speed-versus-voltage curve; always derate clock speed for low-VDD designs.
This page synthesizes distributor pricing context, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, with pricing referenced as of 2026-09-18.
Drop-in alternatives for ATMEGA6490V-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 ATMEGA6490V-8AI (same form factor and footprint) — differing in LCD Controller, Working Registers, Package, EEPROM, Instructions.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA6490V-8AUR
✅ Drop-In✓ In Stock
$9.42 / Unit
View Datasheet →ATMEGA6490V-8AU
✅ Drop-In✓ In Stock
$7.45 / Unit
View Datasheet →ATMEGA6490-16AUR
✅ Drop-In✓ In Stock
$8.45 / Unit
View Datasheet →ATMEGA6490-16AU
✅ Drop-In✓ In Stock
$8.65 / Unit
View Datasheet →ATMEGA6450V-8AU
✅ Drop-In✓ In Stock
$2.31 / Unit
View Datasheet →ATMEGA6490V-8AI Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Maximum Clock Frequency | 8 MHz |
| Flash Program Memory | 64 KB (32K x 16) |
| SRAM | 4 KB |
| EEPROM | 2 KB |
| Supply Voltage Range | 1.8 V to 5.5 V (V-grade) |
| GPIO Count | 54 / 69 general purpose I/O lines |
| Package | 100-TQFP (14x14 mm) |
| Operating Temperature | -40C to +85C (industrial) |
| LCD Controller | Integrated, segment LCD driver (up to 160 segments on 100-pin device) |
| Instructions | 130 powerful instructions, most single-cycle |
| Working Registers | 32 general purpose |
| Self-Programming | Yes, read-while-write ISP Flash |
| Programming/Debug | ICSP via SPI; JTAG-based on-chip debugging |
| Technology | picoPower low-power AVR |
| Mounting Type | Surface Mount |
| RoHS Status | unknown |
ATMEGA6490V-8AI 100-tqfp (14x14 mm) Pin Configuration Guide
Pin configuration for ATMEGA6490V-8AI (100-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 ATMEGA6490V-8AI.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA6490V-8AI is suitable for 6 applications: Utility Metering (Electricity/Water/Gas Meters), LCD-Based Industrial HMI Panels, Battery-Powered Handheld Instruments, HVAC and Building Automation Controllers, Smart Home and IoT Sensor Endpoints, Medical Monitoring and Diagnostic Devices.
Utility Metering (Electricity/Water/Gas Meters)
The ATMEGA6490V-8AI fits utility metering because it combines an integrated segment LCD controller, 64KB Flash for tariff and billing firmware, and 1.8V-5.5V operation that allows direct use of battery or transformer-derived supplies. In a meter front-end, the MCU drives up to 160 LCD segments natively, reads pulse or sensor inputs across its 54/69 GPIO, and stores calibration constants in the 2KB EEPROM. The picoPower process keeps sleep current low for battery-backed meters, while self-programming Flash with read-while-write enables field firmware updates without interrupting measurement. The industrial -40C to +85C range matches outdoor meter enclosures. Place a decoupled 5V or 3V rail ahead of the MCU and use the USART for DLMS/communication modules.
Recommended
LCD-Based Industrial HMI Panels
Industrial human-machine interface panels benefit from the ATMEGA6490V-8AI's native segment LCD driver, generous GPIO matrix for keypads and indicator LEDs, and 64KB Flash for menu trees and localized text. Because the LCD driver is on-chip, the bill of materials avoids a dedicated LCD controller, reducing board area on the 100-TQFP footprint. The 8 MHz AVR core executes the 130-instruction RISC set with mostly single-cycle timing, sufficient for responsive UI scanning and background communication. The -40C to +85C industrial rating covers unconditioned factory floors. Firmware typically runs a cooperative loop scanning keys, refreshing LCD segments via the LCD control registers, and serving RS-485 through the USART; the 4KB SRAM holds display buffers and protocol state.
Recommended
Battery-Powered Handheld Instruments
Portable instruments such as multimeters, detectors, and testers exploit the ATMEGA6490V-8AI's 1.8V minimum supply, which allows direct powering from two alkaline cells or a single Li-SOCl2 cell without a boost converter. The integrated LCD controller keeps the display alive at microamp-class power budgets, and picoPower sleep modes let the MCU idle between measurements. The 2KB EEPROM stores calibration and user settings across battery changes. The JTAG/debugWIRE-capable ICSP interface speeds development, while the 100-pin package exposes enough I/O for rotary encoders, buzzer, backlight control, and serial links simultaneously. Firmware designers should respect the speed-versus-voltage curve below 2.7V and gate unused peripheral clocks to maximize battery life in the field.
Recommended
HVAC and Building Automation Controllers
The ATMEGA6490V-8AI suits HVAC zone controllers and building automation nodes that need a segment display, keypad interface, and serial communication on one chip. Its 64KB Flash accommodates PID control loops, scheduling engines, and Modbus or proprietary protocol stacks, while 54/69 GPIO handles valve and relay drive signals via external drivers. The industrial temperature rating matches plant rooms and rooftop units that see -40C conditions. The 8 MHz core with hardware multiplier executes control arithmetic efficiently at low clock rates, reducing EMI compared with faster MCUs. Designers typically wire a USART to an RS-485 transceiver, use the EEPROM for setpoint persistence, and rely on the on-chip LCD driver for a local status display on the same 100-TQFP device.
Recommended
Smart Home and IoT Sensor Endpoints
Low-voltage IoT endpoints use the ATMEGA6490V-8AI where a simple segmented display and long battery life matter more than processing power. Running from 1.8V-5.5V, the device pairs directly with battery chemistries and low-voltage sensors over its GPIO or SPI/USART interfaces, and the 2KB EEPROM retains device configuration through power cycles. The picoPower AVR architecture supports deep sleep between radio wake-ups; a wireless module attached to the USART handles connectivity while the AVR manages sensing, LCD status, and button input. Its 8 MHz clock is adequate for sensor filtering and protocol framing. For designs prioritizing cost over display, family members without the LCD controller on the same footprint logic can shrink the BOM, but the -8AI keeps the status display essentially free of extra drivers.
Recommended
Medical Monitoring and Diagnostic Devices
Battery-operated medical monitors, such as portable vital-sign recorders, leverage the ATMEGA6490V-8AI's low-voltage operation, on-chip LCD drive for patient-facing readouts, and 64KB Flash for logging algorithms and calibration tables. The 1.8V floor lets the MCU share a rail directly with low-power analog front-ends, minimizing regulator stages, while picoPower sleep modes conserve battery during intermittent sampling. The industrial -40C to +85C range exceeds typical medical storage and transport requirements, adding margin. Self-programming Flash supports controlled firmware updates in the field, an important consideration for validated medical products, and the EEPROM preserves patient device settings. Designers should implement watchdog supervision and CRC-checked parameter storage, using the USART for link to a gateway or printer module.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA6490V-8AI — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA6490V-8AUR | ATMEGA6490V-8AU | ATMEGA6490-16AU | ATMEGA6450V-8AU |
|---|---|---|---|---|---|
| Package | 100-TQFP (14x14 mm) | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Frequency | 8 MHz | 8 MHz | 8 MHz | 16 MHz | 8 MHz |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB | 64 KB |
| SRAM / EEPROM | 4 KB / 2 KB | 4 KB / 2 KB | 4 KB / 2 KB | 4 KB / 2 KB | 4 KB / 2 KB |
| Supply Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | Higher minimum VDD for 16 MHz (V-grade not rated) | 1.8 V to 5.5 V |
| Operating Temperature | -40C to +85C (I-grade) | -40C to +85C (I-grade) | 0C to +70C (commercial) | 0C to +70C (commercial) | 0C to +70C (commercial) |
| Integrated LCD Controller | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Industrial temperature range at low voltage (vs ATMEGA6490V-8AU)
- Low-voltage operation down to 1.8V (vs ATMEGA6490-16AU)
- Pin-identical reel packaging option simplifies volume sourcing (vs ATMEGA6490V-8AUR)
Design Notes
The V-grade device is rated 1.8V-5.5V, but clock frequency and VDD are interdependent: running the full 8 MHz at very low VDD is not guaranteed across the datasheet speed-versus-voltage curve. Estimated rule of thumb for AVR V-parts: limit clock to roughly 2 MHz at 1.8V and 4 MHz at 2.7V unless the datasheet curve confirms otherwise; verify against the manufacturer curve before finalizing the oscillator selection. Brown-out reset threshold should be programmed to match the lowest intended VDD.
On the 100-TQFP (14x14 mm) footprint, place a 100 nF ceramic capacitor within 2 mm of each VCC/AVCC pin pair and a 10 uF bulk capacitor near the supply entry. Separate the analog AVCC supply with an RC filter (e.g., 10 ohm + 100 nF, estimated values) if the ADC or comparator is used, and keep the LCD driver's voltage-generator capacitors close to their designated pins per the datasheet LCD section to avoid segment ghosting.
Do not confuse ordering-code suffixes: the AI part is the industrial-temperature member; substituting an AU commercial part in an outdoor meter can cause field failures above +70C. Also, the JTAG interface pins default to JTAG function - if you need them as GPIO, clear the JTAG enable fuse, which in turn disables on-chip debugging. Finally, EEPROM wear: log write endurance-aware update schemes since the 2KB EEPROM has finite endurance for frequently updated tariff or calibration data.
Compliance Information
Compliance data for the exact ATMEGA6490V-8AI ordering code was not found in the provided web data. Confirm via Microchip product status page or certificate of conformance.
