ATMEGA6490-16AU - 8-Bit AVR MCU 16MHz 64KB LCD | Microchip
MPN： ATMEGA6490-16AU ✓ 啟用中ATMEGA6490-16AU 概覽
A microcontroller (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals onto one die, sitting at the device level of the embedded-systems hierarchy (embedded system -> MCU -> 8-bit AVR family -> ATmega series). The AVR architecture uses a Harvard-structured RISC core with most instructions executing in a single clock cycle, distinguishing it from von Neumann CISC MCUs of the same era.
Key features include 64KB of self-programmable ISP Flash with read-while-write support, 54/69 general-purpose I/O lines, 32 general-purpose working registers, an 8-channel 10-bit ADC, and the integrated LCD controller that eliminates an external LCD driver in instrument designs. The picoPower technology provides multiple sleep modes for very low average power in battery-operated products. A JTAG interface supports boundary-scan testing and on-chip debugging.
Technical depth: the ATmega6490 belongs to the ATmega3290/6490 LCD MCU family; the 130-instruction RISC core reaches up to 16 MIPS at 16MHz, while supply operation spans 2.7V to 5.5V for the 16MHz speed grade, covering both 3.3V and 5V logic systems.
Typical applications include utility meters and energy meters with segment LCD displays, handheld industrial instruments, HVAC control panels, and consumer appliances that combine modest processing with dot/segment LCD feedback.
Design consideration: the 100-TQFP package with fine 0.5 mm pin pitch requires careful PCB land-pattern design and good decoupling on every VCC/AVCC pin pair; the 16AU grade requires 2.7V minimum supply at full 16MHz operation, so derate clock speed or use the V grade at lower voltages.
This page synthesizes distributor pricing, drop-in same-footprint alternatives, and practical design notes not found in the manufacturer datasheet, with pricing referenced as of 2026-09-18.
直接替換替代品，適用於 ATMEGA6490-16AU — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ATMEGA6490-16AU （相同外形與佔位） — 差異在於 Package, EEPROM, Instructions, Operating Temperature, SRAM.
ATMEGA6490A-AU
✅ 直接替換📋 參考替代品（不在目錄中）
ATMEGA6490-16AI
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA6490V-8AU
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA6450-16AU
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA3290-16AU
✅ 直接替換📋 參考替代品（不在目錄中）
ATMEGA6450V-8AU
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA6490-16AU 最大額定值與電氣特性
| Core Architecture | 8-bit AVR RISC |
| Flash Memory | 64KB (32K x 16) ISP Flash |
| SRAM | 4KB |
| EEPROM | 2KB |
| 最大時脈頻率 | 16MHz |
| Supply Voltage Range | 2.7V to 5.5V |
| General Purpose I/O | 54/69 lines |
| ADC Resolution | 10-bit |
| ADC Channels | 8 channels |
| LCD Driver | 4 x 40 segment |
| Working Registers | 32 general purpose |
| Debug Interface | JTAG (boundary-scan and on-chip debug) |
| 封裝 | 100-TQFP (14x14 mm) |
| 安裝類型 | Surface Mount |
| Series | AVR ATmega (picoPower) |
ATMEGA6490-16AU 100-tqfp (14x14 mm) 腳位配置指南
ATMEGA6490-16AU（100-tqfp (14x14 mm) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： ATMEGA6490-16AU.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATMEGA6490-16AU 適用於 6 應用s: Energy and Utility Metering, Handheld Industrial Instruments, HVAC Control Panels, Appliance User Interfaces, POS and Payment Terminals, Battery-Backed Security Panels.
Energy and Utility Metering
Electricity, water, and gas meters are the primary market for the ATMEGA6490-16AU because the device combines the measurement, computation, and display functions of a meter in one chip. The integrated 4x40-segment LCD driver renders billing digits, tariff indicators, and unit symbols directly, eliminating a dedicated LCD controller and its I2C/SPI wiring. The 8-channel 10-bit ADC samples current-shunt and voltage-divider inputs for energy computation, while 64KB Flash holds multi-tariff firmware plus communication stacks. picoPower sleep modes cut average current between display refreshes, and the 2.7V to 5.5V supply range allows direct operation from a mains-derived 5V rail or a backup battery. JTAG boundary scan supports in-circuit production test of the dense 100-TQFP assembly.
推薦
Handheld Industrial Instruments
Portable test gauges, multimeters, and environmental analyzers benefit from the ATMEGA6490-16AU's combination of LCD control, ADC channels, and low standby power. The 4x40-segment LCD driver drives large readouts with clear units, while the 10-bit ADC digitizes sensor front ends such as thermistors, strain bridges, and potentiometer position inputs on up to 8 channels. With 54/69 GPIO lines, a 4x4 keypad, buzzer, LED backlight, and serial links attach without external logic. The 16MHz RISC core delivers up to 16 MIPS for filtering and linearization math in real time. In sleep mode between measurements, battery life in handheld instruments extends to months, which is the decisive factor for field-service devices that cannot be recharged daily.
推薦
HVAC Control Panels
Commercial thermostat and HVAC controller boards use the ATMEGA6490-16AU to integrate user interface and control logic on a single 100-TQFP device. The segment LCD shows setpoint, mode, and schedule information; the 10-bit ADC reads NTC temperature sensors and potentiometer inputs; and the abundant GPIO drives relays, triac optocouplers, and damper actuators across port groups PA-PL. The 64KB Flash accommodates scheduling, PID control, and RS-485/Modbus communication firmware with room for OTA-style field updates via self-programming Flash. Operating at 5V with wide 2.7V tolerance keeps the design compatible with legacy industrial supplies, while power-save mode holds clock and schedule state with microamp-level current during idle periods.
推薦
Appliance User Interfaces
Ovens, washing machines, and white-goods control panels adopt the ATMEGA6490-16AU where a segmented LCD, touch or membrane keypad, and actuator drive must coexist cheaply. The LCD driver renders cycle status and time remaining, while 69 GPIO lines handle encoder inputs, door switches, relay outputs, and buzzer drive without port expanders. The picoPower design supports the standby-current budgets demanded by modern energy-efficiency regulations for appliances in idle mode. Self-programmable ISP Flash allows manufacturing-line firmware loading and post-production feature activation with a bootloader, and JTAG enables fixture-based in-system testing of each assembled panel before it ships, reducing field-return rates in high-volume appliance production.
推薦
POS and Payment Terminals
Point-of-sale keypads, price displays, and entry payment terminals leverage the ATMEGA6490-16AU's LCD driver for numeric customer displays and its GPIO wealth for matrix keypads and card-reader interfaces. The 16MHz AVR core executes DES/AES-era legacy routines and communication formatting fast enough for checkout lines, while 64KB Flash holds terminal firmware, font tables, and protocol stacks. Battery-backup operation during power events is simplified by the low-power sleep modes, which preserve session state at minimal current. The industrial 100-TQFP assembly withstands the vibration and thermal cycling of retail environments, and JTAG boundary scan allows production-line verification of every solder joint across the 0.5 mm pitch device before deployment.
推薦
Battery-Backed Security Panels
Alarm and access-control panels use the ATMEGA6490-16AU to drive the wall-mounted LCD annunciator, scan 16-64 zone inputs, and supervise siren and communicator outputs from one MCU. The ADC reads backup-battery voltage and tamper-circuit analog levels on 8 channels, and the generous GPIO maps directly to zone loops without expander ICs. During mains failure, power-down sleep modes with LCD retention stretch the sealed lead-acid or lithium backup to the multi-hour standby times mandated by security standards. The 2KB EEPROM stores zone configuration and user codes across power cycles and firmware upgrades, while the 64KB ISP Flash supports field firmware updates through a UART bootloader for feature rollouts on installed bases.
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推薦產品摘要
工程參考資料，適用於 ATMEGA6490-16AU — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ATMEGA6490A-AU | ATMEGA6490-16AI | ATMEGA6490V-8AU | ATMEGA6450-16AU | ATMEGA3290-16AU |
|---|---|---|---|---|---|---|
| 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 (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64KB | 64KB | 64KB | 64KB | 64KB | 32KB |
| SRAM | 4KB | 4KB | 4KB | 4KB | 4KB | 2KB |
| Max Clock Speed | 16MHz | 16MHz | 16MHz | 8MHz | 16MHz | 16MHz |
| Supply Voltage | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 1.8V low end (V grade) | 2.7V to 5.5V | 2.7V to 5.5V |
| LCD Driver | 4 x 40 segment | 4 x 40 segment | 4 x 40 segment | 4 x 40 segment | 4 x 40 segment | 4 x 40 segment |
| GPIO Lines | 54/69 | 54/69 | 54/69 | 54/69 | 54 (reduced) | 54 (reduced) |
| Temperature Grade | Commercial (AU) | Commercial | Industrial (-40C to +85C) | Commercial | Commercial | Commercial |
主要差異化特點
- Maximum GPIO count in the LCD AVR family (對比ATMEGA6450-16AU)
- Full-speed 16MHz operation at commercial grade (對比ATMEGA6490V-8AU)
- Integrated segment LCD driver (對比ATMEGA640-16AUR)
設計說明
The 100-TQFP (14x14 mm, 0.5 mm pitch) land pattern requires conforming to the Microchip-recommended footprint in the datasheet mechanical drawing. Use 2 oz copper for power traces where available and place 100 nF ceramic decoupling capacitors within 3 mm of every VCC/AVCC/UVCC pin pair, one per pin. Add a 10 uF bulk capacitor near the supply entry. Extend the exposed ground ring around the package and stitch multiple vias to the ground plane to reduce loop area and improve JTAG signal margins on long traces.
The 16AU grade requires at least 2.7V at the full 16MHz operating frequency; running 16MHz below 2.7V violates the speed-vs-voltage curve and causes unreliable execution. If the system runs from a single lithium cell (down to 2.0V), choose the V grade (ATMEGA6490V-8AU) and cap the clock at 8MHz. Estimated: a typical active current of roughly 10-15 mA at 5V/16MHz (verify against the datasheet active-current table for your exact conditions) means a 500 mAh battery lasts about 30-40 hours of continuous operation; sleep modes are mandatory for battery products.
Keep the LCD segment and common traces away from the ADC input nets and crystal traces; the LCD bias-generation waveforms couple capacitively into high-impedance analog lines and show up as flicker in ADC readings. Route ADC channel traces short and shielded with ground guard traces, and connect AVCC to VCC through an LC or RC filter (e.g., 10 uH ferrite plus 100 nF) when the ADC is used with shared noisy 5V. Provide a JTAG header (TCK/TMS/TDO/TDI plus reset) on production PCBs for boundary-scan manufacturing test.
Migrating from ATMEGA6490-16AU to ATMEGA6490A is usually seamless, but review the Microchip migration note first: minor differences in ADC conversion timing and calibration bytes can affect firmware that assumes fixed timing loops. Never drive unused GPIO as outputs fighting external pull-ups, and configure unused pins as inputs with internal pull-ups for lowest noise. When self-programming Flash in the field, always reserve the bootloader section with the fuse settings before shipping, because changing boot-size fuses after deployment bricks remote units.
合規資訊
AU suffix denotes standard lead-free RoHS-compliant TQFP packaging per Microchip convention and distributor listings (DigiKey/Mouser). REACH, halogen-free, and conflict-minerals declarations should be confirmed via Microchip's official quality/compliance documentation.
