ATMEGA6490P-AUR - 8-bit AVR MCU 64KB Flash LCD | Microchip
MPN: ATMEGA6490P-AUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.95 | $8.95 |
| 10 | $8.1 | $81.00 |
| 100 | $7.25 | $725.00 |
| 500 | $6.6 | $3,300.00 |
| 1,000 | $5.95 | $5,950.00 |
ATMEGA6490P-AUR Overview
An 8-bit AVR microcontroller is a reduced-instruction-set (RISC) single-chip computer that executes most of its 130 instructions in a single clock cycle. Within the power-management hierarchy, it combines the CPU, program memory, data memory, peripherals, and an LCD controller in one IC, making it a member of the broader microcontroller (MCU) family used in embedded systems.
Key features include up to 20 MHz maximum clock frequency, 54 general purpose I/O lines (69 I/O including LCD segment pins), read-while-write self-programming Flash, and an on-chip LCD controller capable of driving a large glass with up to 4 backplane/common terminals. The picoPower technology delivers industry-low power consumption in all active and sleep modes, which is essential for battery-operated instruments.
Technically, the AVR advanced RISC architecture provides 32 general purpose working registers directly connected to the ALU, allowing one-cycle execution and achieving throughput near 1 MIPS per MHz. In-system programmable (ISP) Flash with boot-section self-programming enables field firmware updates, while the on-chip debug via debugWIRE-type tooling and ICSP simplifies development with MPLAB Snap and similar programmers.
Typical applications include utility metering with LCD displays, handheld measurement instruments, industrial control panels, and battery-powered human-interface devices where an integrated segment LCD driver removes the need for a separate LCD controller.
When designing with this device, verify the clock-voltage relationship: operation at the full 20 MHz rating requires the higher end of the supply range, while lower supply voltages constrain the maximum safe clock frequency per the AVR frequency-vs-voltage curve in the manufacturer datasheet.
This page synthesizes distributor listings, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet, with pricing references as of 2026-09-18.
Drop-in alternatives for ATMEGA6490P-AUR — 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 ATMEGA6490P-AUR (same form factor and footprint) — differing in Operating Temperature, LCD Controller, Program Memory Size, RAM Size, SRAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA6490P-AU
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA3290P-20AUR
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →ATMEGA3290PA-AUR
✅ Drop-In✓ In Stock
$2.95 / Unit
View Datasheet →ATMEGA3290A-AU
✅ Drop-In✓ In Stock
$3.85 / Unit
View Datasheet →ATMEGA6450P-AUR
✅ Drop-In✓ In Stock
$4.18 / Unit
View Datasheet →ATMEGA6490P-AUR Maximum Ratings & Electrical Characteristics
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 20 MHz |
| Program Memory Size | 64 KB (32K x 16) FLASH |
| Program Memory Type | ISP FLASH, self-programming, read-while-write |
| EEPROM Size | 2 KB |
| RAM Size | 4 KB |
| Number of I/O | 54 (69 including LCD segment drive) |
| Peripherals | LCD controller, picoPower, brown-out detect/reset, POR, WDT |
| Architecture | Advanced RISC, 130 instructions, 32 x 8-bit working registers |
| Operating Temperature | -40C to +85C (A grade, industrial) |
| Package | 100-TQFP (14x14 mm) |
| Mounting Type | Surface Mount |
| Programming Interface | ICSP (In-Circuit Serial Programming) |
| Lifecycle Stage | ACTIVE |
ATMEGA6490P-AUR 100-tqfp (14x14 mm) Pin Configuration Guide
Pin configuration for ATMEGA6490P-AUR (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 ATMEGA6490P-AUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA6490P-AUR is suitable for 6 applications: Utility Metering (Electricity/Gas/Water), Handheld Measurement Instruments, Industrial Control Panels and HMI, Battery-Powered Wearable and Portable Devices, Building Automation and Smart Thermostats, POS Terminals and Retail Equipment.
Utility Metering (Electricity/Gas/Water)
The ATMEGA6490P-AUR fits utility metering because its integrated LCD controller drives the multi-digit consumption display directly, its 64 KB Flash holds metrology firmware and tariff tables, and picoPower technology minimizes average current so battery-backed meters last their full service interval. In a typical meter, the MCU polls pulse or UART inputs from the sensing front-end, accumulates consumption in the 2 KB EEPROM for power-loss retention, and refreshes the LCD glass in low-power drive mode. The 100-pin TQFP provides enough I/O for keypad scanning, tamper switches, and optical communication ports simultaneously, avoiding an external LCD driver IC and its associated BOM cost and quiescent current.
Recommended
Handheld Measurement Instruments
Handheld multimeters, Environmental meters, and panel testers benefit from the ATMEGA6490P-AUR's single-chip integration: the AVR core at up to 20 MHz executes ADC post-processing and display refresh, while the segment LCD driver renders readings without a companion display IC. The 4 KB SRAM buffers measurement logs, and the 2 KB EEPROM stores calibration constants that survive battery replacement. picoPower sleep modes keep standby current in the microamp range between measurements, which is decisive for instruments powered by 9 V alkaline cells. The 69 usable I/O lines support rotary encoders, backlight control, and range-switching relays concurrently, and ICSP programming through two I/O pins and reset allows factory calibration firmware to be flashed after final assembly.
Recommended
Industrial Control Panels and HMI
In industrial control panels, the ATMEGA6490P-AUR acts as a local human-machine interface controller: its LCD driver renders status menus and alarm codes, 54 general purpose I/O lines scan keypads and drive indicator LEDs and relays, and the -40C to +85C industrial temperature grade survives cabinet environments. The watchdog timer and brown-out reset meet panel reliability expectations by recovering the firmware after supply dips caused by contactor inrush. With 64 KB of self-programming Flash, a boot-loader can update HMI firmware over RS-485 or UART during service windows without removing the board. The read-while-write Flash architecture lets the application execute from one Flash section while the boot section writes the other, keeping the display responsive during updates.
Recommended
Battery-Powered Wearable and Portable Devices
Portable devices with a small segment display - medical dosimeters, dive computers, fitness bands - use the ATMEGA6490P-AUR because picoPower technology delivers low current in idle, power-save, and standby modes, extending battery life substantially compared with non-picoPower predecessors. The integrated LCD driver with software-configurable frame rate allows engineers to trade display contrast against drive current, a key optimization for coin-cell products. The 64 KB Flash accommodates the larger firmware footprint of BLE-adjacent protocol stacks and signal processing, while 4 KB SRAM handles sensor data windows. Because the LCD controller and CPU share one supply domain, sleep-entry and wake sequencing are handled entirely on-chip, simplifying firmware compared with a discrete two-chip MCU-plus-LCD-driver solution.
Recommended
Building Automation and Smart Thermostats
Smart thermostats and room controllers pair the ATMEGA6490P-AUR's LCD driver with its I/O capacity to deliver a complete thermostat on one MCU: the display shows setpoint and schedule, GPIO reads occupancy sensors and relay feedback, and timer peripherals generate PWM for HVAC actuation. The 2 KB EEPROM stores user schedules and commissioning data through power cycles, and the brown-out detector protects schedule integrity during HVAC transformer sags. picoPower modes keep the thermostat within wall-plate power budgets when powered from a phantom supply, and the 20 MHz headroom leaves margin for adding a communication stack to the 64 KB Flash. Family pin compatibility with ATMEGA3290P variants lets manufacturers offer basic and premium thermostat SKUs on one PCB layout.
Recommended
POS Terminals and Retail Equipment
Point-of-sale terminals, price look-up keypads, and label printers use the ATMEGA6490P-AUR to merge keypad scanning, LCD status display, and peripheral control in a single 8-bit AVR. Its 54 GPIO lines scan a large key matrix while simultaneously driving the segment LCD customer display, and the 64 KB self-programming Flash stores application code plus a boot-loader for field updates of tax tables and firmware. The industrial temperature rating suits unconditioned retail back-office environments, and the watchdog timer recovers terminals automatically after power anomalies. Because the AVR executes most instructions in one cycle at up to 20 MIPS, matrix scanning and display refresh run in interrupt context without starving the application loop, eliminating the need for a dedicated display or keypad scanner IC.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA6490P-AUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA6490P-AU | ATMEGA3290P-20AUR | ATMEGA3290PA-AUR | ATMEGA3290A-AU | ATMEGA6450P-AUR |
|---|---|---|---|---|---|---|
| Package | 100-TQFP (14x14) | 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 | 64 KB | 64 KB | 32 KB | 32 KB | 32 KB | 64 KB |
| SRAM | 4 KB | 4 KB | 2 KB | 2 KB | 2 KB | 4 KB |
| picoPower Technology | Yes | Yes | Yes | Yes | No (A variant) | Yes |
| LCD Controller | Yes (integrated segment driver) | Yes | Yes | Yes | Yes | Yes (smaller segment count) |
Key Differentiators
- Largest Flash in the pin-compatible LCD AVR family (vs ATMEGA3290P-20AUR)
- Double the SRAM of the 3290 variants (vs ATMEGA3290PA-AUR)
- picoPower low-power technology (vs ATMEGA3290A-AU)
- 20 MHz maximum clock (vs ATMEGA3290A-AU)
- Trade-off: higher cost than 3290-class parts (vs ATMEGA3290P-20AUR)
Design Notes
Verify the AVR frequency-versus-supply-voltage curve before fixing the clock source. DigiKey lists this part at 20 MHz while some family summaries show 16 MHz at 4.5-5.5 V; the maximum safe frequency derates as supply voltage falls. For battery designs, either run a lower crystal frequency across the full voltage envelope or add a supply supervisor that resets the MCU if VCC drops below the voltage required for the chosen clock. The brown-out detector threshold should be set above the minimum voltage valid for the operating frequency.
Place 100 nF ceramic decoupling capacitors at each VCC/AVCC pin pair, as close as possible to the 100-TQFP power pins, plus one bulk 4.7-10 uF capacitor near the supply entry. Connect AVCC to VCC through an RC filter (e.g., 10 ohm + 100 nF) when ADC accuracy matters, and keep the LCD drive traces away from the crystal and analog routing to prevent segment-coupled noise. The TQFP-100 land pattern should follow the manufacturer datasheet footprint with solder-mask-defined pads for reliable reflow.
Do not assume the plain ATMEGA6490P-AU and the -AUR are electrically different - they are not; the difference is packing (tray vs tape-and-reel). Conversely, do not assume ATMEGA3290 family parts are identical: they halve Flash and SRAM, so link your firmware against the correct memory map and verify code size before drop-in substitution. Finally, remember that LCD segment pins are multiplexed with GPIO - using all 69 I/O lines means giving up LCD drive capability; plan the pin budget before layout freeze.
Compliance Information
Suffix conventions indicate lead-free/Pb-free finishing for AU-packaged AVR parts, but RoHS/REACH status must be confirmed from the official Microchip product compliance page; not provided in verified web data.
