ATMEGA6490-16AI - 64KB Flash 16MHz AVR LCD MCU | Microchip
料号： ATMEGA6490-16AI ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $7.2 | $7.20 |
| 10 | $6.55 | $65.50 |
| 100 | $5.9 | $590.00 |
| 500 | $5.35 | $2,675.00 |
| 1,000 | $4.85 | $4,850.00 |
ATMEGA6490-16AI 概述
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle. Within the power-management hierarchy of embedded systems, it serves as the central processing element, sitting above simple logic ICs but below 32-bit application processors. The AVR ATmega family from Microchip (formerly Atmel) is widely used for cost-sensitive embedded control where integrated peripherals reduce system part count.
Key features include 64 KB of self-programming Flash with read-while-write capability, 135 powerful instructions with most executing in a single cycle, 32 general purpose working registers, and an on-chip LCD controller supporting up to 4x40 segments. The picoPower technology enables low sleep-mode currents for battery-operated designs.
The advanced RISC architecture combines a rich instruction set with fast single-cycle ALU operation, delivering up to 16 MIPS throughput at 16 MHz. Integrated peripherals include an 8-channel 10-bit ADC, multiple timers/pWM channels, USART serial interfaces, SPI, TWI (I2C), and JTAG for on-chip debugging, allowing a single chip to replace MCU plus dedicated LCD driver plus external ADC solutions.
Typical applications include utility metering with LCD displays, industrial control panels, battery-powered instrumentation, and white-goods human-machine interfaces where the integrated segment LCD driver and 69 general purpose I/O lines simplify board design.
When designing with this device, the -AI suffix denotes the industrial temperature range of -40C to +85C; verify JTAG fuse settings before debugging, since JTAG can be disabled by default. Place 100 nF decoupling capacitors at each VCC/GND pair.
This page synthesizes verified distributor data, same-family drop-in alternatives, and practical design notes not found in a single manufacturer source.
直接替换替代料： ATMEGA6490-16AI ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATMEGA6490-16AI （相同外形与封装尺寸） ——差异在于 Operating Temperature, Supply Voltage Range, EEPROM, Package, SRAM.
快速对比工具——选择替代料号进行并排对比：
ATMEGA6490-16AU
✅ 直接替换✓ 有现货
$8.65 / 个
查看数据手册 →ATMEGA6450-16AUR
✅ 直接替换✓ 有现货
$5.66 / 个
查看数据手册 →ATMEGA3290-16AI
✅ 直接替换✓ 有现货
$4.14 / 个
查看数据手册 →ATMEGA6450V-8AU
✅ 直接替换✓ 有现货
$2.31 / 个
查看数据手册 →ATMEGA6490P-16AU
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATMEGA3250-16AU
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$5.74 / 个
查看数据手册 →ATMEGA6490-16AI 最大额定值与电气特性
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 16 MHz |
| Program Flash Memory | 64 KB (32K x 16) |
| EEPROM Size | 2 KB |
| RAM Size | 4 KB |
| Number of I/O | 69 |
| LCD Driver | Yes, segment LCD (up to 4x40 segments) |
| ADC | 8-channel 10-bit |
| Connectivity | USART, SPI, TWI (I2C) |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT, LCD, JTAG |
| Oscillator Type | Internal |
| 工作温度 | -40C to +85C |
| 封装 / 外壳 | 100-TQFP (14x14 mm) |
| 安装类型 | Surface Mount |
| Technology | picoPower |
ATMEGA6490-16AI 100-tqfp (14x14 mm) 引脚配置指南
ATMEGA6490-16AI（100-tqfp (14x14 mm) 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： ATMEGA6490-16AI.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATMEGA6490-16AI 适用于 6 应用s: Utility Metering (Electricity, Water, Gas), Industrial Control Panels and HMI, Battery-Powered Portable Instrumentation, White Goods and Appliance UI, Building Automation and Security Panels, POS Terminals and Payment Peripherals.
Utility Metering (Electricity, Water, Gas)
The ATMEGA6490-16AI fits electricity, water, and gas meters because it integrates the MCU, 4x40 segment LCD driver, 10-bit ADC, and 2 KB EEPROM in one 100-TQFP chip, removing a dedicated LCD controller from the bill of materials. The 10-bit ADC samples shunt or current-transformer signals for energy measurement, while the EEPROM stores calibration and tariff data through power cycles. picoPower sleep modes cut standby current for battery-backed meters, and read-while-write Flash allows firmware update without losing measurement state. Designers should budget ADC sampling and LCD refresh timing carefully so that measurement accuracy is maintained during segment multiplexing, and should reserve UART or TWI for AMR/AMI communication heads.
推荐
Industrial Control Panels and HMI
Factory panels need local display, keypad scanning, and serial links - exactly the peripheral set of the ATMEGA6490-16AI. The 69 GPIO lines drive keypads, LEDs, and relays; the segment LCD shows setpoints and alarms; USART, SPI, and TWI connect to PLC backbones or sensors. The -40C to +85C industrial rating and brown-out detector ensure reliable reset behavior on noisy industrial power rails, while JTAG enables on-chip debugging of state machines. Using the single-chip LCD MCU replaces an MCU-plus-LCD-driver stack, cutting BOM and board area in the 14x14 mm TQFP. Designers should add transient protection on externally exposed I/O and debounce key inputs in firmware or with RC networks.
推荐
Battery-Powered Portable Instrumentation
Handheld testers and portable gauges benefit from the ATMEGA6490-16AI's picoPower architecture: power-down and power-save modes drop current to microamp levels while the asynchronous timer or RTC keeps timing. The internal oscillator eliminates an external crystal for cost-sensitive or shock-prone products, with the option to add one for USART accuracy. The LCD driver draws minimal current compared to backlit graphic displays, extending battery life in daylight-readable designs. The 64 KB Flash accommodates feature-rich measurement firmware, logging tables, and multi-language menus without external memory. Engineers should measure actual sleep current with all unused GPIO configured as inputs with pull-ups disabled to realize the datasheet-class battery lifetime.
推荐
White Goods and Appliance UI
Washers, ovens, and HVAC thermostats use the ATMEGA6490-16AI as a single-chip UI controller: segment LCD for cycle status, GPIO matrix for touch buttons, 10-bit ADC for NTC temperature sensing, and PWM-capable timers for buzzer and heater/relay drive. The industrial temperature grade tolerates kitchen and boiler-room ambient conditions, and the watchdog timer plus brown-out reset recover cleanly from brown-out events on shared mains supplies. Firmware stored in 64 KB Flash supports multiple product SKUs from one PCB. Use the EEPROM for wear-leveled cycle counters and fault logs. Verify LCD biasing resistor values against panel specifications to balance contrast against drive current.
推荐
Building Automation and Security Panels
Zone controllers and access panels leverage the ATMEGA6490-16AI's mix of many I/O, serial links, and local LCD status display. TWI (I2C) and SPI expand to RTC chips, EEPROM, and sensor front-ends; USART connects to RS-485 transceivers for long cable runs across floors. The 64 KB Flash holds protocol stacks and event logs, while the on-chip EEPROM securely retains configuration through outages. The 16 MHz core executes most single-cycle instructions, giving headroom for CRC checks and keypad encryption routines. Designers should isolate RS-485 lines, use the watchdog for lockup recovery, and keep JTAG disable fuses set in deployed units so the debug port cannot be used to dump firmware.
推荐
POS Terminals and Payment Peripherals
Point-of-sale keypads and customer-display modules use the ATMEGA6490-16AI's LCD driver for price/quantity segments and its GPIO matrix for keypad scanning, with USART or SPI linking to the main payment board. The 64 KB Flash supports multi-protocol firmware, and EEPROM stores device serials and calibrations. Low sleep current suits countertop devices that idle most of the day. The mature AVR toolchain (AVR GCC, MegaCore Arduino support) speeds firmware development and long-term maintenance for legacy POS fleets. Engineers should implement keypad scanning with row/column diode matrices to prevent ghosting and use checksummed EEPROM writes to survive unexpected power loss during transactions.
推荐
推荐产品汇总
工程参考数据： ATMEGA6490-16AI ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ATMEGA6490-16AU | ATMEGA6450-16AUR | ATMEGA3290-16AI | 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 |
| Program Flash | 64 KB | 64 KB | 64 KB | 32 KB | 64 KB |
| Max CPU Speed | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 8 MHz |
| SRAM | 4 KB | 4 KB | 4 KB | 2 KB | 4 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 1 KB | 2 KB |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| LCD Driver | Yes (segment LCD, up to 4x40) | Yes (same) | Yes (segment configuration differs) | Yes (same family) | Yes (same family) |
关键差异点
- Double the program memory of the value tier （对比 ATMEGA3290-16AI)
- Full-speed operation （对比 ATMEGA6450V-8AU)
- Integrated segment LCD driver （对比 ATMEGA640-16AUR)
设计说明
Estimated: decouple each VCC/GND pin pair of the 100-TQFP with a 100 nF ceramic capacitor placed within 2 mm of the pin, plus one bulk 4.7-10 uF capacitor near the supply entry. Input values used: 16 MHz core activity and typical AVR supply decoupling practice from the ATmega datasheet layout recommendations. Undecoupled high-frequency transients on multi-pin MCUs cause flash corruption and LCD ghosting that are hard to diagnose.
JTAG shares pins with port F GPIO and can be disabled by fuse settings, leaving debug sessions silently broken. Verify JTAGEN fuse state before hardware bring-up, and if the pins are needed as GPIO in production, disable JTAG via fuse and document it in the BOM change notes. Similarly, the LCD driver pins multiplex with GPIO - configure the LCDCSR registers before assuming port reads on those pins reflect external signals.
Route LCD segment lines away from the ADC input traces and crystal; segment multiplexing creates fast-switching edges that couple charge into the 10-bit ADC and degrade effective resolution. Keep the crystal (if used for UART timing) within 10 mm of the XTAL pins with short ground return. Use a solid ground plane under the TQFP rather than thermal-relief spokes on the exposed ground returns for lowest impedance.
合规信息
Compliance attributes were not stated in the verified web data retrieved; confirm RoHS/REACH status on the official Microchip product page before procurement.
