ATMEGA649-16AU - 8-Bit AVR MCU 64KB LCD | Microchip
料号： ATMEGA649-16AU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $9.73 | $9.73 |
| 10 | $8.76 | $87.60 |
| 100 | $7.81 | $781.00 |
| 500 | $7.02 | $3,510.00 |
| 1,000 | $6.27 | $6,270.00 |
ATMEGA649-16AU 概述
An 8-bit AVR microcontroller is a single-chip computing device built on the AVR enhanced RISC architecture, which executes most instructions in a single clock cycle. Within the system hierarchy, the ATmega649 sits in the power-management-and-control layer of an embedded system, combining a processing core, non-volatile memory, analog-to-digital conversion, serial interfaces, and an LCD driver on one die. This level of integration replaces multiple discrete components and is a classic choice for cost-sensitive, display-based embedded products.
Key features include 54/69 general purpose I/O lines (package dependent), 32 general purpose working registers, a JTAG interface for boundary-scan and on-chip debugging, read-while-write Flash for in-system self-programming, and an on-chip segment LCD controller - the defining feature separating the ATmega649 from the otherwise similar ATmega64. A 10-bit ADC and multiple timers round out the peripheral set.
Architecturally, the device pairs the AVR RISC core with Harvard memory organization, achieving up to 16 MIPS throughput at 16 MHz. The ISP Flash supports firmware updates in the field, while the JTAG port enables boundary-scan testing of assembled boards and hardware debugging via Microchip tools such as MPLAB SNAP, ICE3, and AVR ONE.
Typical applications include industrial panel meters and metering equipment with segment LCDs, HVAC and building-control units, battery-powered instruments, and low-cost HMI front-ends where the integrated LCD driver removes the need for an external display controller.
A key design consideration is that the newer ATmega649A revision supersedes this device; Microchip lists the ATMEGA649A for new designs, though the -16AU remains available from distributors.
This page adds distributor pricing tiers, drop-in alternatives within the same TQFP-64 footprint, and practical design notes not found in the standard datasheet. Pricing shown as of 2026-09-18.
直接替换替代料： ATMEGA649-16AU ——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： ATMEGA649-16AU （相同外形与封装尺寸） ——差异在于 Package, Operating Temperature, RoHS Status, EEPROM, ADC.
快速对比工具——选择替代料号进行并排对比：
ATMEGA649A-AU
✅ 直接替换📋 参考替代料（不在目录中）
ATMEGA645-16AI
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$6.45 / 个
查看数据手册 →ATMEGA329-16AU
✅ 直接替换✓ 有现货
$8.45 / 个
查看数据手册 →AT90CAN64-16AU
✅ 直接替换📋 参考替代料（不在目录中）
ATMEGA64-16AU
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$7.23 / 个
查看数据手册 →ATMEGA128-16AU
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$14.3 / 个
查看数据手册 →ATMEGA649-16AU 最大额定值与电气特性
| Core | 8-bit AVR RISC |
| Core Size | 8-bit |
| Max Clock Frequency | 16 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 (package dependent) |
| Working Registers | 32 general purpose |
| LCD Controller | Integrated segment LCD driver |
| Debug / Test Interface | JTAG (boundary-scan and on-chip debug) |
| 封装 | 64-TQFP (14 x 14 mm) |
| 安装类型 | Surface Mount |
| 工作温度范围 | Industrial, -40C to +85C (IND TEMP per part marking) |
| Throughput | Up to 16 MIPS at 16 MHz |
| ADC | On-chip 10-bit ADC |
| Programming | In-System Programmable (ISP) Flash, ICSP via MPLAB SNAP |
| RoHS 状态 | Compliant (GREEN package per distributor data) |
| Newer Device Available | ATMEGA649A |
ATMEGA649-16AU 64-tqfp (14 x 14 mm) 引脚配置指南
ATMEGA649-16AU（64-tqfp (14 x 14 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： ATMEGA649-16AU.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATMEGA649-16AU 适用于 6 应用s: Utility and Panel Metering with Segment LCD, HVAC and Building Control Panels, Battery-Powered Portable Instruments, Point-of-Sale and Vending Terminals, Medical and Laboratory Monitoring Devices, Industrial HMI and Machine Interface Boards.
Utility and Panel Metering with Segment LCD
The ATMEGA649-16AU fits utility meters, energy panel meters, and process indicators because its integrated segment LCD controller drives multi-segment glass directly, eliminating an external LCD driver IC and its interconnect cost. The 64 KB ISP Flash (32K x 16) holds metrology algorithms, communication stacks, and multi-language menu firmware with headroom for field upgrades via read-while-write self-programming, while the 10-bit ADC digitizes current and voltage sense channels. The 2 KB EEPROM stores calibration constants that survive power loss. In a typical meter, the MCU runs from a 16 MHz crystal, samples sense inputs through the ADC, computes consumption, and refreshes the LCD at battery-friendly duty cycles; the industrial -40C to +85C rating supports outdoor meter cabinets without supplementary thermal design.
推荐
HVAC and Building Control Panels
In HVAC thermostats, zone controllers, and building automation front-ends, the ATMEGA649-16AU combines user-interface duty (LCD, buttons via GPIO) with control logic in a single 8-bit AVR. The 54/69 GPIO lines interface relays, dampers, and rotary encoders; the 10-bit ADC reads NTC temperature sensors with reasonable resolution for 0.1 C-class control; and timers generate PWM outputs for valve and fan actuation. The integrated LCD controller renders setpoints and status without a display co-processor, keeping the bill of materials to one MCU plus passives. The JTAG interface enables boundary-scan test of assembled control boards and hardware debugging during development. Firmware benefits from the 4 KB SRAM for scheduling tables and the 2 KB EEPROM for user setpoint persistence across power cycles.
推荐
Battery-Powered Portable Instruments
The ATMEGA649-16AU suits handheld and portable instruments - leakage detectors, inspection gauges, environmental probes - where a segment LCD and low average power are essential. AVR power-management features (idle and power-down sleep modes controlled in software) let the core sleep between measurement cycles, so a 16 MHz peak clock coexists with multi-month battery life when the application samples periodically. The integrated LCD controller can keep segments visible in low-power states, the ADC handles sensor front-ends without an external converter, and 2 KB EEPROM logs calibration and user settings. The 64-TQFP 14 x 14 mm footprint fits compact two-layer boards, and the industrial temperature rating covers field use. Designers should budget reset supervision and consider the LCD drive configuration to minimize glass current.
推荐
Point-of-Sale and Vending Terminals
Vending controllers, ticket machines, and simple point-of-sale terminals use the ATMEGA649-16AU for keypad scanning, segment-LCD price/status display, and peripheral control. The 64 KB Flash accommodates inventory logic, multi-currency menus, and communication firmware, while the read-while-write capability allows parameters such as pricing tables to be rewritten from firmware without halting execution. USART serial links connect to payment modules or back-end gateways, and the 4 KB SRAM buffers transaction records locally, with the 2 KB EEPROM providing non-volatile fallback. JTAG boundary-scan supports in-circuit test of the assembled terminal board, an advantage for contract manufacturers running ICT. The industrial temperature range tolerates outdoor vending enclosures, and the 16 MHz core provides ample responsiveness for UI latency under 100 ms.
推荐
Medical and Laboratory Monitoring Devices
Benchtop monitors, sample analyzers, and therapy-timer devices benefit from the ATMEGA649-16AU's integration: the segment LCD controller displays measurement readouts, the 10-bit ADC conditions transducer signals, and the AVR core executes filtering and limit-checking algorithms within its 64 KB Flash. The EEPROM retains patient-configuration profiles and calibration data, and JTAG on-chip debugging accelerates firmware validation for regulated development processes where traceable test evidence matters. The industrial -40C to +85C rating exceeds clinical ambient requirements, providing margin for enclosed, fanless housings. Designers must implement appropriate isolation and supervision for safety-critical paths - the MCU is a control/display element, not a certified medical component. Its single-chip integration shortens the approval documentation chain by reducing the external component count on the display path.
推荐
Industrial HMI and Machine Interface Boards
Machine-mounted interface boards - pump controllers, conveyor status panels, small process controllers - use the ATMEGA649-16AU where a numeric/status LCD, keypad, and a handful of actuator outputs define the I/O budget. The AVR RISC core at 16 MHz executes control loops with single-cycle instructions, and timers produce PWM or capture encoder feedback. Boundary-scan JTAG allows production ICT to verify every board trace to the LCD and connector field, reducing field failures. The 54/69 GPIO count interfaces limit switches and contactors through optocouplers, and the 10-bit ADC supervises supply and thermal sensors for fault logging into EEPROM. The TQFP-64 industrial package withstands panel vibration, and the family roadmap to ATmega649A protects long-life industrial products from end-of-life risk.
推荐
推荐产品汇总
工程参考数据： ATMEGA649-16AU ——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 | ATMEGA649A-AU | ATMEGA645-16AI | ATMEGA329-16AU | AT90CAN64-16AU | ATMEGA64-16AU |
|---|---|---|---|---|---|---|
| Package | 64-TQFP (14 x 14 mm) | 64-TQFP (14 x 14 mm) - same | 64-TQFP (14 x 14 mm) - same | 64-TQFP (14 x 14 mm) - same | 64-TQFP (14 x 14 mm) - same | 64-TQFP (14 x 14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB (32K x 16) | 64 KB | 64 KB | 32 KB | 64 KB | 64 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 2 KB | 4 KB | 4 KB |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| LCD Controller | Yes (integrated segment LCD) | Yes | Yes | Yes | No | No |
| Special Peripheral | Segment LCD controller + JTAG | Segment LCD controller + JTAG | Segment LCD controller | Segment LCD controller | CAN 2.0A/2.0B controller | Extended timer/USART set |
| Lifecycle Position | Active (newer ATMEGA649A available) | Active - recommended for new designs | Active | Active | Active | Active |
关键差异点
- Integrated segment LCD controller （对比 ATMEGA64-16AU)
- Twice the memory of the LCD-family sibling （对比 ATMEGA329-16AU)
- Boundary-scan testability （对比 ATMEGA645-16AI)
- Migration path to a current die revision （对比 ATMEGA649A-AU)
设计说明
Decouple each VCC pin and AVCC with 100 nF ceramic capacitors placed within a few millimeters of the pins, plus a bulk 4.7-10 uF capacitor near the supply entry. Connect AVCC to VCC through a low-pass RC (e.g. 10 ohm / 100 nF) when ADC accuracy matters, and tie AREF to ground through 100 nF for internal-reference operation. The TQFP-64 center thermal pad region does not exist on this family, so heat is dissipated via the fine-pitch leads; keep copper pours on the top layer connected to the ground pins.
The ATmega649 multiplexes LCD segment pins with GPIO and JTAG pins on port C and the port E/F/G region - if the LCD controller is enabled, those pins are no longer available as GPIO, so plan the pin budget before routing. Also note that JTAG is enabled out of reset; port C pins PC2-PC5 default to JTAG function unless the JTAGEN fuse is disabled or firmware reclaims them, which surprises designers expecting full GPIO on startup. Verify the JTAGEN and OCDEN fuse settings in production to free pins and reduce power.
Estimated: supply current scales linearly with clock, so running at 16 MHz from a 5 V rail costs roughly an order of magnitude more current than 1 MHz operation. For battery products, run the internal RC oscillator at 1-8 MHz during measurement phases and drop to power-down sleep between samples; a 3 V rail rather than 5 V further cuts dynamic power. Size the 16 MHz crystal load capacitors per the crystal datasheet (typically 12-22 pF total effective) and keep the XTAL traces short and guarded to avoid startup margin issues at cold temperatures.
For the LCD, keep segment and backplane traces balanced in length and away from switching nodes (relay drivers, PWM lines) to prevent ghosting caused by capacitive coupling into the high-impedance LCD drive waveforms. Route the LCD drive lines on an inner layer referenced to a clean ground plane. If the board carries an ADC sensor front-end, separate the analog ground region and connect it to digital ground at a single point near the MCU to preserve 10-bit ADC accuracy.
合规信息
GREEN package marking per distributor/FindIC data indicates RoHS-compliant, lead-free construction. Industrial grade (not AEC-Q100). Formal REACH, halogen-free, and conflict-minerals declarations must be requested from Microchip.
