ATMEGA6490V-8AUR - 8-bit AVR MCU 64KB LCD 8MHz TQFP-100 | Microchip
MPN: ATMEGA6490V-8AUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.85 | $12.85 |
| 10 | $11.56 | $115.60 |
| 25 | $10.9 | $272.50 |
| 100 | $10.28 | $1,028.00 |
| 1,000 | $9.42 | $9,420.00 |
ATMEGA6490V-8AUR Overview
An 8-bit AVR microcontroller is a single-chip processor built around the AVR enhanced RISC architecture, executing most instructions in a single clock cycle. Within the system hierarchy, it sits at the embedded processing layer of a design, combining a CPU core, program memory (Flash), data memory (SRAM and EEPROM), peripherals, and an LCD driver in one integrated circuit, replacing a discrete MCU plus external LCD controller combination.
Key features include 64KB of self-programmable ISP Flash with read-while-write support, a JTAG interface for boundary-scan, on-chip debugging, and programming, an integrated LCD controller with support for up to 4x100 segment drive for glass directly driven by the MCU, and picoPower technology for microamp-level sleep currents. The 'V' speed grade guarantees full operation down to 1.8V, enabling single-cell or low-voltage battery designs.
Technically, the device combines 32 general purpose working registers with a two-stage pipeline Harvard architecture, delivering close to 1 MIPS per MHz. Peripheral set includes multiple timers, USARTs, SPI, and TWI (I2C), all clocked from internal RC or external crystal sources with a brown-out detector and power-on reset for supply robustness.
Typical applications include battery-powered metering (utility meters with direct LCD glass drive), handheld instruments with segmented displays, and industrial control panels where an MCU plus LCD in one chip reduces board area and quiescent power.
A key design consideration: the 'V' grade tops out at 8 MHz; if your design needs 16 MHz or 20 MHz at 5V, select the ATmega6490A/P family instead.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATMEGA6490V-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 ATMEGA6490V-8AUR (same form factor and footprint) — differing in RoHS Status, EEPROM, SRAM, LCD Controller, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA6490V-8AU
✅ Drop-In✓ In Stock
$7.45 / Unit
View Datasheet →ATMEGA6490A-AUR
✅ Drop-In✓ In Stock
$6.55 / Unit
View Datasheet →ATMEGA3290V-8AUR
✅ Drop-In✓ In Stock
$2.3 / Unit
View Datasheet →ATMEGA6450V-8AU
✅ Drop-In✓ In Stock
$2.31 / Unit
View Datasheet →ATMEGA640V-8AU
✅ Drop-In✓ In Stock
$3.95 / Unit
View Datasheet →ATMEGA6490V-8AI
✅ Drop-In✓ In Stock
$6.45 / Unit
View Datasheet →ATMEGA6490V-8AUR Maximum Ratings & Electrical Characteristics
| Core Processor | AVR 8-bit RISC |
| Core Size | 8-bit |
| Speed | 8 MHz |
| Flash Memory | 64 KB (32K x 16) ISP, read-while-write |
| EEPROM | 2 KB |
| SRAM | 4 KB |
| GPIO | 54 / 69 general purpose I/O lines |
| Working Registers | 32 x 8-bit general purpose |
| LCD Controller | Integrated segment LCD driver |
| Operating Voltage | 1.8 V to 5.5 V |
| Debug / Programming | JTAG (boundary-scan, on-chip debug, ISP) |
| Peripherals | Brown-out detect/reset, POR, picoPower |
| Connectivity | SPI, TWI (I2C), USART |
| Package | 100-TQFP (14x14 mm) |
| Mounting Type | Surface Mount |
| Packing | Tape & Reel (R suffix) |
ATMEGA6490V-8AUR 100-tqfp (14x14 mm) Pin Configuration Guide
Pin configuration for ATMEGA6490V-8AUR (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-8AUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA6490V-8AUR is suitable for 6 applications: Battery-Powered Utility Metering, Handheld Instruments with Segmented Displays, Industrial Control Panels with LCD, Thermostats and HVAC Controllers, Point-of-Sale and Price Displays, Consumer Appliance User Interfaces.
Battery-Powered Utility Metering
The ATMEGA6490V-8AUR fits electricity, water, and gas meter designs because it combines the MCU, 64KB Flash for metrology and billing firmware, and an integrated segment LCD driver in one chip, eliminating a separate LCD controller and its interconnect. PicoPower sleep modes keep average current in the microamp range between measurement cycles, while the 1.8V 'V' speed grade keeps the MCU alive at battery end-of-life. Read-while-write Flash lets consumption records be logged without halting measurement firmware. Place the device between the battery and LCD glass directly; the trade-off is the 8 MHz ceiling, which is ample for metering but not for fast DSP.
Recommended
Handheld Instruments with Segmented Displays
Portable handheld instruments - multimeters, inspection gauges, environmental testers - benefit from the ATMEGA6490V-8AUR's single-chip integration of LCD drive, 4KB SRAM for buffers, and JTAG on-chip debug. The 100-pin TQFP offers 69 GPIO for keypad matrices, buzzer, and sensor interfaces, so one MCU replaces MCU-plus-LCD-driver-plus-port-expander solutions, shrinking PCB area and assembly cost. Operation down to 1.8V supports two-cell alkaline or single Li-cell designs with a simple LDO. Designers should budget for the 8 MHz maximum when computing ADC oversampling and display refresh rates; in practice 8 MHz easily refreshes 100+ segments at low power.
Recommended
Industrial Control Panels with LCD
Industrial control panels need a status/readout display, robust I/O, and long service life. The ATMEGA6490V-8AUR drives segmented LCD glass directly, offers SPI and TWI (I2C) for interfacing with port expanders, ADC front-ends, and EEPROM, and provides a brown-out detector plus power-on reset for reliable operation on noisy factory supplies. The industrial variant ATMEGA6490V-8AI covers extended temperature environments. Using the internal RC oscillator avoids a crystal on high-vibration panels, while JTAG enables in-system firmware updates during commissioning. Note the 5.5V maximum supply - level-shift or protect I/O connected to 24V industrial signals.
Recommended
Thermostats and HVAC Controllers
HVAC thermostats require an LCD, low standby power, EEPROM for user settings, and a small instruction-efficient core - all native strengths of the ATMEGA6490V-8AUR. The 2KB EEPROM stores setpoints and schedules across power loss; picoPower modes plus the LCD controller allow the display to remain active at microamp-class average current; 1.8V operation tolerates battery backup sag. USARTs connect to RS-485 transceivers for building automation buses. The ATmega6490 die's 69 GPIO accommodate relay drivers, keypad, and sensor inputs without expansion. Firmware footprint of typical HVAC logic fits comfortably in the 64KB Flash, leaving room for OTA-style bootloader code.
Recommended
Point-of-Sale and Price Displays
Battery or mains-powered price tags, queue displays, and POS accessories use the ATMEGA6490V-8AUR's integrated LCD drive to render segmented price/quantity information without an external display controller. The 64KB ISP Flash with read-while-write supports field-updatable price tables via USART or TWI links while the application keeps running, avoiding visible downtime. The 14x14 mm TQFP-100 footprint keeps the display PCB compact. Because the LCD controller is on-chip, contrast voltage must be derived from the 1.8V-5.5V supply - verify your glass bias specification against the available rail to ensure uniform segment contrast across the supply range.
Recommended
Consumer Appliance User Interfaces
Washing machines, cooktops, and other appliances use segmented LCDs and a keypad as the primary user interface. The ATMEGA6490V-8AUR integrates that LCD drive with 69 GPIO for relays, triac drive logic, rotary encoders, and touch-style key matrices, plus a JTAG port for manufacturing test and firmware service. The 8 MHz 'V' grade is sufficient for UI and control loops, and operation from an unregulated 3V-5V rail with brown-out protection guards against brown-out-induced Flash corruption during motor inrush. Cost-sensitive appliance platforms often use the 32KB ATMEGA3290V-8AUR on the identical footprint, giving a two-tier BOM strategy on one PCB layout.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA6490V-8AUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA6490V-8AU | ATMEGA3290V-8AUR | ATMEGA640V-8AU |
|---|---|---|---|---|
| Package | 100-TQFP (14x14 mm) | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB (32K x 16) | 64 KB | 32 KB | 64 KB |
| SRAM | 4 KB | 4 KB | 2 KB | 8 KB |
| LCD Controller | Yes (integrated segment LCD) | Yes | Yes | No |
| Max Speed | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Operating Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Low-Power Technology | picoPower | picoPower | picoPower | picoPower |
| Packing | Tape & Reel (R) | Tray | Tape & Reel | Tray |
Key Differentiators
- Integrated segment LCD controller (vs ATMEGA640V-8AU)
- Double the Flash of the cost-down sibling (vs ATMEGA3290V-8AUR)
- 1.8 V picoPower operation (vs ATMEGA6490A-AUR)
Design Notes
Enable the brown-out detector (and set its threshold appropriately for your supply) whenever the design operates below 2.7V or performs Flash self-programming. At 1.8V operation near battery end-of-life, a supply dip during read-while-write Flash operations can corrupt stored data. Combine with the internal power-on reset for deterministic startup, and sequence the LCD bias voltage after the digital core is stable to avoid ghost segments at power-up.
The 100-TQFP 14x14 mm package requires careful decoupling: place a 100 nF ceramic capacitor at each VCC/AVCC/GND pin pair, within 2-3 mm of the pads, plus one bulk 10 uF per supply domain. Keep the LCD bias generation trace away from the crystal and analog signals. Route JTAG (TDI/TDO/TMS/TCK) as a test-access header even if unused in application, since it enables boundary-scan production test and in-system firmware updates.
Remember the 'V' speed grade is limited to 8 MHz - do not design timing loops, UART baud rates, or USB-adjacent logic assuming 16/20 MHz availability; if higher throughput is needed, migrate to the ATmega6490A/ATmega640 at design time. JTAG pins are shared with port pins: enabling JTAGEN at reset locks those four pins to JTAG function, reducing usable GPIO from 69 to 65 - plan port allocation early and disable JTAG in software only after final debug.
Compliance Information
The related FindIC listing describes the family variant as GREEN package, but explicit RoHS/REACH/lead-free certification status for ATMEGA6490V-8AUR was not present in the provided web data - confirm on Microchip's official product page.
