ATMEGA3208-AU - 8-bit AVR MCU 32KB 20MHz TQFP-32 | Microchip
部品番号: ATMEGA3208-AU ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $1.99 | $1.99 |
| 10 | $1.87 | $18.70 |
| 100 | $1.77 | $177.00 |
| 500 | $1.68 | $840.00 |
| 1,000 | $1.59 | $1,590.00 |
ATMEGA3208-AU 概要
A microcontroller is a single-chip embedded computer that integrates a processor core, program memory, data memory, and peripherals on one die. The ATMEGA3208-AU belongs to the megaAVR 0-series, Microchip's modernized AVR family that succeeded the classic ATmega328-class parts; within the taxonomy it sits in the hierarchy: MCU -> 8-bit microcontroller -> AVR microcontroller -> megaAVR 0-series -> ATmega3208.
Key features include a 2-stage pipeline AVR core with hardware multiplier executing most instructions in a single cycle, 10-bit ADC with up to 12 external channels, three USARTs, one SPI and one I2C (TWI) interface, and event system peripherals for inter-peripheral signaling without CPU intervention. The part supports operation from 1.8V to 5.5V, with 1.8V operation allowed up to 5 MHz per Microchip documentation, enabling both low-power and 5V industrial designs.
Technically, the megaAVR 0-series introduces a peripheral event system, configurable custom logic (CCL), and improved ADC with accumulative sampling. Flash self-programming supports bootloader firmware updates, and 256 bytes of EEPROM retain calibration or user data through power cycles.
Typical applications include industrial control, IoT end nodes, motor control, metering, and low-power embedded automation boards. Community firmware support exists via the MegaCoreX Arduino hardware package covering ATmega4809/4808/3209/3208/1609/1608/809/808.
Design consideration: obey the frequency-versus-voltage derating curve - at 3.3V the safe maximum clock is lower than 20 MHz, so verify the datasheet graph before selecting the crystal.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
ドロップイン代替品: ATMEGA3208-AU — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ATMEGA3208-AU （同一形状・フットプリント） — 相違点: Core Processor, Series, Peripherals, Package, Packaging.
クイック比較ツール — 並列比較する代替部品を選択:
ATMEGA4808-AU
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
ATMEGA1608-AU
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$0.86 / 個
データシートを見る →ATMEGA808-AU
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
ATMEGA3208-AF
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$1.86 / 個
データシートを見る →ATMEGA3208-XU
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$0.84 / 個
データシートを見る →ATMEGA3208-AU 最大定格＆電気的特性
| Core Processor | AVR (8-bit RISC) |
| Core Size | 8-bit |
| Speed | 20 MHz |
| Flash Program Memory | 32 KB (16K x 16) |
| SRAM | 4 KB |
| EEPROM | 256 bytes |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Minimum Supply Voltage | 1.8 V (at 5 MHz) |
| ADC Resolution | 10-bit |
| ADC Channels | 12 external channels |
| USART | 3 |
| SPI | 1 |
| I2C (TWI) | 1 |
| パッケージ | 32-TQFP (7 x 7 mm) |
| 実装タイプ | Surface Mount |
| Series | megaAVR 0 (Functional Safety FuSa capable) |
| RoHS ステータス | ROHS3 Compliant |
ATMEGA3208-AU 32-tqfp (7 x 7 mm) ピン配置ガイド
ATMEGA3208-AU (32-tqfp (7 x 7 mm) パッケージ) のピン配置。 このデジタルICには、GPIO、通信インターフェース (UART、SPI、I2C)、および電源ピンが含まれています。代替ピン機能と設定オプションについては、メーカーのデータシートを参照してください。組み込みシステム設計とPCBレイアウトに不可欠です。
詳細なピン配置データはありません: ATMEGA3208-AU.
詳細は データシート をご参照ください。
主な用途
ATMEGA3208-AU の用途: 6 件s: Industrial Control and Automation, IoT End Nodes and Sensors, Motor Control, Metering and Measurement, Embedded Human-Machine Interfaces, Low-Power Battery-Operated Boards.
Industrial Control and Automation
The ATMEGA3208-AU fits industrial control nodes because its 5 V-tolerant 1.8-5.5 V supply range provides classic industrial noise margin, and the 20 MHz AVR core with hardware multiplier executes control loops deterministically. The megaAVR 0-series event system routes timer and comparator signals to peripherals without CPU intervention, keeping PWM and safety responses latency-free. Three USARTs support Modbus RTU links plus a debug console simultaneously, while the 10-bit ADC with 12 channels reads potentiometers, sensors, and supply monitors. Use its CCL configurable logic to offload simple gating from firmware. Flash self-programming enables field firmware updates via an RS-485 bootloader.
おすすめ
IoT End Nodes and Sensors
For IoT end nodes, the ATMEGA3208-AU combines a low 1.8 V minimum supply (at 5 MHz) with sleep modes that let battery devices idle at microamp-class currents between wakeups. The 32 KB Flash accommodates a protocol stack plus OTA bootloader, while 4 KB SRAM buffers sensor packets for the 3 USARTs, SPI, or I2C (TWI) link to a radio module. The 10-bit ADC reads battery voltage and analog sensors with accumulative sampling to improve effective resolution. Community firmware support via MegaCoreX shortens development. Pair with a sub-GHz or BLE radio module over UART for complete sensor-to-cloud designs.
おすすめ
Motor Control
The ATMEGA3208-AU is suitable for DC and stepper motor control: its 20 MHz single-cycle core plus hardware multiplier runs PI control loops with predictable timing, and the event system couples timer PWM outputs to fault inputs with no software latency. The 10-bit ADC samples motor current through up to 12 channels for closed-loop torque regulation, while CCL logic can implement hardware dead-time or gating primitives. At 5 V operation the GPIO sources enough drive for gate-driver inputs, and three USARTs handle host commands. Microchip lists motor control as a target application for the megaAVR 0-series in its official positioning.
おすすめ
Metering and Measurement
Metering applications benefit from the ATMEGA3208-AU's 256 bytes of EEPROM, which retain calibration constants and tamper counters through power loss without external NVM. The 10-bit ADC with accumulative oversampling increases effective resolution for current and voltage sensing, and the 20 MHz core with hardware multiplier performs RMS accumulation in fixed-point math. Three USARTs support utility communication (DLMS/Modbus) while a second serial link drives a local display. Operation from 1.8 V to 5.5 V accommodates battery-backed designs, and the 32 KB Flash stores multi-tariff firmware with room for a secure field-update bootloader.
おすすめ
Embedded Human-Machine Interfaces
The ATMEGA3208-AU drives HMI panels effectively: multiple USARTs can feed a display module while a third serial link handles host communication, and its 4 KB SRAM buffers UI state and string tables within the 32 KB Flash. Capacitive or resistive touch can be implemented on the 12 ADC channels using Microchip's touch sensing libraries for the megaAVR 0-series, and the CCL plus event system offload scanning to keep the CPU free for rendering. Buzzer and backlight PWM outputs are timer-driven. Running from 5 V gives bright LED-backlight drive capability, while 3.3 V operation suits modern display modules.
おすすめ
Low-Power Battery-Operated Boards
For battery-powered designs, the ATMEGA3208-AU offers a 1.8 V minimum supply permitted at up to 5 MHz per Microchip documentation, letting designers run a low-speed clock directly from two alkaline cells. Sleep modes cut current dramatically between wakeups, and the event system can capture ADC readings and comparator events without waking the CPU. The 10-bit ADC monitors battery voltage via its internal channels, and 256 bytes of EEPROM log state across resets. Wake-up sources on all ports enable interrupt-driven designs where a sensor triggers the MCU only when data arrives, extending battery life to years in duty-cycled nodes.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ATMEGA3208-AU — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ATMEGA4808-AU | ATMEGA1608-AU | ATMEGA808-AU | ATMEGA3208-AF | ATMEGA3208-XU |
|---|---|---|---|---|---|---|
| Package | 32-TQFP (7x7 mm) | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash | 32 KB | 48 KB | 16 KB | 8 KB | 32 KB | 32 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| Max CPU Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Supply 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 | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| ADC | 10-bit, 12 ch | 10-bit, 12 ch | 10-bit, 12 ch | 10-bit, 12 ch | 10-bit, 12 ch | 10-bit, 12 ch |
| Qualification Grade | Standard (AU) | Standard (AU) | Standard (AU) | Standard (AU) | Automotive/extended (AF) | Extended industrial (XU) |
主な差別化要因
- Balanced 32 KB Flash for mid-size firmware （vs ATMEGA1608-AU)
- Cost-optimized versus larger sibling （vs ATMEGA4808-AU)
- Modern 0-series peripherals versus classic ATmega （vs ATMEGA328P-AU)
設計ノート
Respect the frequency-versus-voltage derating: Microchip documentation permits 1.8 V operation only up to 5 MHz. For a 20 MHz design, operate near the upper end of the 1.8-5.5 V range (typically 5 V). Decouple VDD with 100 nF ceramic plus 10 uF bulk close to the pin. Estimated: at 20 MHz and 5 V, core current is on the order of a few mA per the megaAVR 0-series datasheet typical curves - verify exact value for your sleep/wake duty cycle budget.
The 32-TQFP (7x7 mm) has 0.8 mm pitch, easily hand-solderable and reworkable. Place the 100 nF decoupling capacitor within 2 mm of the VDD pin, and route the UPDI one-wire debug header (single-pin programming via PA0) to a test point for in-system programming. Keep the crystal (if used) within 10 mm of the clock pins with short guard ground traces. Expose a solid ground plane under the package for ADC noise performance.
Do not assume classic ATmega328P firmware ports unchanged: the megaAVR 0-series uses different register maps, a peripheral event system, and new sleep/PPU structures. Rebuild with an updated compiler target and verify startup configuration. Also remember EEPROM endurance limits write cycles - implement wear leveling for frequently updated counters. The UPDI interface replaces the classic ISP pins, so legacy programmers will not work; use a UPDI-capable tool or serial bootloader.
コンプライアンス情報
ROHS3 Compliant per Cytech Systems distributor listing. REACH, lead-free, halogen-free and conflict-minerals statuses require Microchip certificate confirmation.