ATMEGA6490V-8AU - 8-bit AVR MCU 64KB 8MHz 100-TQFP | Microchip
MPN: ATMEGA6490V-8AU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $10.82 | $10.82 |
| 10 | $9.95 | $99.50 |
| 100 | $8.9 | $890.00 |
| 500 | $8.1 | $4,050.00 |
| 1,000 | $7.45 | $7,450.00 |
ATMEGA6490V-8AU Overview
A microcontroller of this class combines a CPU core, program memory, data memory, and peripherals on a single chip, eliminating external glue logic for embedded control systems. The ATmega family is widely used wherever low power and deterministic single-cycle instruction execution are required.
Key features include 130 powerful instructions with mostly single-cycle execution, read-while-write self-programming Flash, 54/69 general-purpose I/O lines, a JTAG interface for boundary-scan and on-chip debugging, and an integrated segment LCD driver that differentiates the ATmega6490 from standard ATmega parts. The picoPower technology family provides multiple sleep modes for ultra-low standby current in battery-powered designs.
Architecturally, the AVR core uses a Harvard structure with 32 general-purpose working registers directly connected to the ALU, allowing one instruction to execute per clock cycle for high code efficiency. Self-programming Flash enables in-system programmability and boot-loader operation without external programmers in the field.
Typical applications include battery-operated devices with LCD user interfaces such as utility meters, thermostats, handheld instruments, and industrial control panels. The built-in LCD controller reduces bill-of-material cost by removing an external LCD driver IC.
Design consideration: the V-grade speed grade limits operation to 8MHz across the 1.8V to 5.5V supply range; if your application needs 16MHz at 5V, select the standard ATmega6490A/P grade instead.
This page synthesizes distributor pricing, drop-in alternatives within the ATmega LCD family, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATMEGA6490V-8AU — 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-8AU (same form factor and footprint) — differing in Flash Memory, Supply Voltage Range, Package, LCD Controller, Instructions.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA6490V-8AUR
✅ Drop-In✓ In Stock
$9.42 / Unit
View Datasheet →ATMEGA6490V-8AI
✅ Drop-In✓ In Stock
$6.45 / Unit
View Datasheet →ATMEGA6490A-AU
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA6450V-8AU
✅ Drop-In✓ In Stock
$2.31 / Unit
View Datasheet →ATMEGA3290V-8AU
✅ Drop-In✓ In Stock
$3.91 / Unit
View Datasheet →ATMEGA6490V-8AU Maximum Ratings & Electrical Characteristics
| Core | AVR 8-bit RISC |
| Core Size | 8-bit |
| Speed | 8MHz |
| Program Memory Size | 64KB (32K x 16) Flash |
| EEPROM Size | 2KB |
| SRAM Size | 4KB |
| Number of I/O | 54 / 69 general purpose I/O lines |
| Working Registers | 32 general purpose registers |
| LCD Controller | Integrated segment LCD driver |
| Debug Interface | JTAG (boundary-scan and on-chip debug) |
| Program Memory Type | ISP FLASH, read-while-write, self-programming |
| Package | 100-TQFP (14x14 mm) |
| Mounting Type | Surface Mount |
| Technology | picoPower low power |
| Supply Voltage Range (V-grade) | 1.8 V to 5.5 V |
| Instructions | 130 instructions, most single clock cycle |
ATMEGA6490V-8AU 100-tqfp (14x14 mm) Pin Configuration Guide
Pin configuration for ATMEGA6490V-8AU (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-8AU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA6490V-8AU is suitable for 6 applications: Utility Metering (Electricity/Gas/Water Meters), Battery-Powered Handheld Instruments, Thermostats and HVAC Control Panels, Industrial HMI and Front-Panel Displays, Consumer Appliances with LCD UI, Security and Access Control Terminals.
Utility Metering (Electricity/Gas/Water Meters)
The ATMEGA6490V-8AU fits utility metering because it combines 64KB of self-programming Flash for complex billing firmware with an integrated segment LCD driver that renders consumption digits without an external LCD controller, cutting BOM cost. The 2KB EEPROM stores calibration constants and tamper logs that survive Flash updates, while picoPower sleep modes keep average current low in battery-backed meters. Typical designs clock the MCU from a 32.768kHz watch crystal in idle mode and burst to 8MHz for computation. The 8MHz V-grade limit is rarely a constraint for metering workloads, and the 1.8V operation end-of-life threshold supports full use of the battery discharge curve.
Recommended
Battery-Powered Handheld Instruments
Handheld measurement and test instruments benefit from the ATMEGA6490V-8AU's single-chip integration of an 8-bit AVR core, 4KB SRAM, and LCD controller, which minimizes board area inside compact enclosures. Its picoPower technology offers multiple sleep levels; a typical handheld spends most of its time in power-down with only the LCD and a low-frequency oscillator active, waking to 8MHz on button press or ADC completion. The JTAG interface enables in-field firmware updates through boundary-scan-capable debug pods, and read-while-write Flash allows boot-loader-based feature upgrades without disassembly. The 54/69 GPIO lines interface keypads, sensors, and communication links in one footprint.
Recommended
Thermostats and HVAC Control Panels
Wall thermostats and HVAC zone controllers use the ATMEGA6490V-8AU to drive multi-digit LCD segments showing setpoints and schedules while its AVR core executes PID control loops. The 64KB Flash accommodates communication protocol stacks (e.g., proprietary bus or Modbus over UART) alongside the control firmware, and the 2KB EEPROM holds user schedules through power loss. The 1.8V-5.5V supply range allows direct operation from a 3V lithium cell, and the 8MHz ceiling is more than sufficient for thermal control loop rates in the hertz range. PicoPower wake-up on pin-change interrupts enables instant response to user button presses while maintaining long battery life.
Recommended
Industrial HMI and Front-Panel Displays
Industrial equipment front panels require a robust LCD interface, non-volatile logging, and field-updatable firmware - all native to the ATMEGA6490V-8AU. The integrated LCD driver handles segment panels directly, freeing the 69 GPIO lines for relays, indicators, and serial links, while self-programming Flash supports boot-loader updates over RS-485/UART during maintenance windows. The 100-TQFP (14x14 mm) industrial SMD package withstands standard reflow processes, and JTAG boundary scan supports production-line ICT of the populated board. Wide 1.8V-5.5V operation tolerates degraded rail conditions, and the AVR's deterministic single-cycle execution supports precise timing for key-scan and LED backlight PWM.
Recommended
Consumer Appliances with LCD UI
White-goods and small appliances with LCD interfaces (microwave ovens, coffee machines, washers) use the ATMEGA6490V-8AU because the integrated segment LCD controller and 64KB Flash replace a two-chip MCU-plus-LCD-driver solution, reducing cost and failure points. The 32 general-purpose working registers and single-cycle execution handle real-time user input, buzzer tones, and sensor polling concurrently in a simple super-loop. The wide 1.8V-5.5V operating range suits mains-derived low-voltage supplies, and picoPower standby modes meet low off-mode power expectations. The 100-TQFP package offers the generous pin count needed for matrix keypads, load drivers, and optional touch or encoder inputs.
Recommended
Security and Access Control Terminals
Access-control keypads and security terminals leverage the ATMEGA6490V-8AU's LCD driver for status display, its 2KB EEPROM for credential blacklists and audit trails, and 64KB Flash for encryption and protocol firmware. The JTAG interface can be fuse-disabled in production to protect proprietary code - an important security design point per the datasheet's lock-bit architecture. Wake-on-interrupt from power-down supports battery-backed operation during mains failure, and the 54/69 I/O lines drive readers, locks, and tamper switches. The 8MHz core comfortably handles AES-class software routines at the transaction rates typical of door controllers.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA6490V-8AU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA6490V-8AUR | ATMEGA6490V-8AI | ATMEGA6490A-AU | ATMEGA6450V-8AU | ATMEGA3290V-8AU |
|---|---|---|---|---|---|---|
| Package | 100-TQFP (14x14 mm) | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64KB (32K x 16) | 64KB | 64KB | 64KB | 64KB | 32KB |
| EEPROM | 2KB | 2KB | 2KB | 2KB | 2KB | 2KB |
| SRAM | 4KB | 4KB | 4KB | 4KB | 4KB | 2KB |
| LCD Controller | Yes (integrated segment LCD) | Yes | Yes | Yes | Yes | Yes |
| Temperature Grade | Commercial (AU) | Commercial (AUR reel) | Industrial (AI) | Commercial (AU) | Commercial (AU) | Commercial (AU) |
| Lifecycle Position | Mature (newer ATMEGA6490A available) | Mature | Mature | Newer recommended device | Mature | Mature |
Key Differentiators
- Integrated LCD controller eliminates external driver IC (vs ATMEGA644V-10PU)
- Double the program memory of the low-cost family sibling (vs ATMEGA3290V-8AU)
- Lifecycle risk mitigated by the newer A-variant successor (vs ATMEGA6490A-AU)
Design Notes
The V speed grade restricts safe clocking to 8MHz across the entire 1.8V to 5.5V supply range. Do not overclock toward 16MHz as done with standard ATmega parts at 5V - the V-grade silicon is not characterized for it. For battery designs, exploit the 1.8V floor: the MCU continues operating as a 3V coin cell discharges to end-of-life, unlike 2.7V-minimum parts. Decouple each VCC/AVCC pin pair with 100nF ceramics placed within 5mm of the pins, and filter AVCC through an LC network if ADC accuracy matters.
The 100-TQFP (14x14 mm) exposes LCD segment/common pins multiplexed with GPIO; route LCD lines away from switching loads (relays, backlight drivers) to prevent ghost segments from capacitive coupling. Keep the LCD bias network close to the device and follow the datasheet's recommended resistor values for contrast control. The 0.8mm pin pitch requires careful fanout - a 4-layer board with the two inner layers as ground/power planes simplifies escape routing and improves EMC for the 8MHz system clock.
Three recurring mistakes with this family: (1) forgetting to disable JTAG via the JTD fuse/bit in production, which steals four port pins (TCK/TMS/TDO/TDI) needed as GPIO; (2) ignoring the JTAGEN fuse state when porting designs from non-JTAG ATmega parts; (3) assuming drop-in compatibility with the ATMEGA6450/3290 without re-validating LCD segment mapping and interrupt vectors - the family shares the package but peripheral allocation differs per variant. Always run boundary-scan interconnect tests before full ICT deployment.
Compliance Information
Compliance status not stated in the provided web data; the AU suffix on Atmel/Microchip parts conventionally denotes lead-free/RoHS packages, but this must be confirmed on the official Microchip product page before claiming compliance.
