ATMEGA3208-MFR - 8-bit AVR MCU 20MHz 32KB Flash QFN-32 | Microchip
MPN： ATMEGA3208-MFR ✓ 啟用中ATMEGA3208-MFR 概覽
A microcontroller (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals such as timers, communication interfaces, and analog blocks. The megaAVR 0-series sits within Microchip's 8-bit AVR family, occupying the role of a general-purpose, mid-density MCU for cost-sensitive embedded control in the wider power-management and system-control hierarchy.
Key features include the AVR RISC core with hardware multiplier for efficient arithmetic, up to 20 MHz CPU clock, 32 KB self-programmable Flash for firmware, 4 KB SRAM for runtime data, and 256 bytes of EEPROM for non-volatile parameter storage. The device is offered in 28- and 32-pin packages, giving designers footprint flexibility; this listing is the 32-VFQFN 5x5 mm variant.
The megaAVR 0-series architecture uses the latest AVR core with single-cycle I/O access, event system interconnects between peripherals, and modern peripherals shared across the 0-series family (ATmega3208/3209/4808/4809). Code portability within the family is high, and the MegaCoreX community Arduino package provides support for the ATmega3208 alongside the ATmega4809/3209/1609/809 family members, easing prototyping and firmware reuse.
Typical applications include industrial automation and control nodes, functional-safety-oriented consumer and industrial subsystems, home appliances, lighting control, and sensor interfacing where an 8-bit MCU with hardware multiply and adequate Flash/SRAM reduces external component count.
A key design consideration is supply and clock configuration: verify the exact operating voltage range, temperature grade, and peripheral set against the official ATmega3208/3209 data sheet (DS40002174) before finalizing the power tree and clock tree, as this page only restates parameters confirmed in verified distributor data.
This page synthesizes distributor listings (DigiKey, Mouser), manufacturer product information, drop-in family alternatives, and practical design notes not found in a single datasheet, providing consolidated sourcing and engineering context in one place.
直接替換替代品，適用於 ATMEGA3208-MFR — 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： ATMEGA3208-MFR （相同外形與佔位） — 差異在於 Core Processor, Package, Flash Memory Size, EEPROM, SRAM.
ATMEGA3208-MU
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ATMEGA4808-MU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA1608-MU
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ATMEGA808-MU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA4808-MFR
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA3208-MFR 最大額定值與電氣特性
| Core Processor | AVR (8-bit, with hardware multiplier) |
| Core Size | 8-Bit |
| Speed | 20 MHz |
| Flash Memory Size | 32 KB (16K x 16) |
| SRAM | 4 KB |
| EEPROM | 256 bytes |
| Series | megaAVR 0-series |
| Safety Feature | Functional Safety (FuSa) |
| 封裝 | 32-VFQFN (5x5 mm) |
| 安裝類型 | Surface Mount |
ATMEGA3208-MFR 32-vfqfn (5x5 mm) 腳位配置指南
ATMEGA3208-MFR（32-vfqfn (5x5 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： ATMEGA3208-MFR.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATMEGA3208-MFR 適用於 6 應用s: Industrial Automation and Control, Functional Safety Subsystems, Home Appliances, Sensor Interfacing Nodes, Lighting Control, Prototyping and Education (Arduino MegaCoreX).
Industrial Automation and Control
The ATMEGA3208-MFR suits industrial automation nodes that need deterministic 8-bit control with low BOM cost. Its 20 MHz AVR core with hardware multiplier executes PID-style control loops efficiently, while 32 KB Flash holds communication state machines and 4 KB SRAM buffers sensor and bus traffic. The 256 B EEPROM retains calibration constants through power cycles, and the FuSa designation supports safety-relevant subsystem documentation. Placed as the local control MCU driving relays, sensors, and a UART/SPI link to a higher-level controller, it consolidates logic that would otherwise require glue logic or a larger, costlier MCU, with the trade-off of an 8-bit architecture for floating-point-heavy algorithms.
推薦
Functional Safety Subsystems
The -MFR grade of the ATmega3208 targets Functional Safety (FuSa) contexts where the MCU supplier must provide safety-oriented documentation for the end-system assessment. The device keeps the standard megaAVR 0-series electrical behavior - 20 MHz AVR core, 32 KB Flash, 4 KB SRAM, 256 B EEPROM in 32-VFQFN - so safety designs retain full family tooling and code portability. It is typically used as the monitored control element executing safety logic with external or internal supervision mechanisms; the safety architecture (watchdog, diagnostics, brown-out) must be configured per the ATmega3208/3209 datasheet DS40002174C, since this page does not restate the device's built-in diagnostic features.
推薦
Home Appliances
Appliance control boards - cookers, washers, small HVAC units - are a classic megaAVR fit. The ATMEGA3208-MFR's 32 KB Flash stores user-interface logic, sensor compensation tables, and communication handlers; the hardware multiplier accelerates scaling math for temperature and load sensing; and the 256 B EEPROM persists user settings without external NVM. Operating as the front-panel and sequencing controller, it reads buttons and sensors through multiplexed GPIO/ADC pins of ports A-C and drives displays, heaters, or motors via GPIO/timers. The 32-pin VFQFN 5x5 footprint keeps two-layer layouts compact, and the family upgrade path to ATMEGA4808 allows feature growth without a footprint change.
推薦
Sensor Interfacing Nodes
Distributed sensor nodes benefit from the ATMEGA3208-MFR's single-wire UPDI programming, low pin-count footprint, and adequate memory for local filtering and protocol translation. The 20 MHz core with hardware multiplier performs fixed-point averaging and calibration math; 4 KB SRAM supports windowed buffering of samples; and 256 B EEPROM holds per-unit calibration from production. Acting as a bridge between analog/digital sensors and a UART, SPI, or I2C backbone, it reduces host-CPU interrupt load. The FuSa designation also permits use in monitored monitoring chains; verify the exact peripheral multiplexing per pin in the DS40002174C pinning tables during schematic capture.
推薦
Lighting Control
LED driver and lighting-control boards use the ATMEGA3208-MFR as the sequencing and dimming controller. Hardware timers on the megaAVR 0-series generate PWM channels for dimming, the hardware multiplier accelerates color-mix and gamma-correction math, and 32 KB Flash accommodates scene tables plus DMX-style protocol handling. The 256 B EEPROM stores last-set brightness and scene configuration across power loss. Positioned between a mains or DC supply stage and the LED driver transistors, it coordinates fade curves, fault responses, and user input. Designers should confirm timer channel counts and PWM capabilities in the datasheet, as this page does not enumerate peripheral instances.
推薦
Prototyping and Education (Arduino MegaCoreX)
The ATMEGA3208 is supported by the open-source MegaCoreX Arduino hardware package (MCUdude/MegaCoreX), alongside the ATmega4809/3209/1609/809 family, making the ATMEGA3208-MFR a practical prototyping and teaching platform. Developers get Arduino IDE workflows on an 8-bit AVR with hardware multiplier, 20 MHz clock, and the megaAVR 0-series event system, then can port directly between family members with the same footprint. In coursework and hobby projects it drives displays, servos, and simple sensors while exposing register-level programming for embedded-systems education. Firmware written for the Uno WiFi Rev2's ATmega4809 family largely carries over, shortening the path from prototype to a production board using the 32-VFQFN part.
推薦
推薦產品摘要
工程參考資料，適用於 ATMEGA3208-MFR — 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 | ATMEGA3208-MU | ATMEGA4808-MU | ATMEGA1608-MU | ATMEGA808-MU | ATMEGA4808-MFR |
|---|---|---|---|---|---|---|
| Package | 32-VFQFN (5x5 mm) | 32-VFQFN (5x5 mm) - same | 32-VFQFN (5x5 mm) - same | 32-VFQFN (5x5 mm) - same | 32-VFQFN (5x5 mm) - same | 32-VFQFN (5x5 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB (16K x 16) | 32 KB (16K x 16) | 48 KB | 16 KB | 8 KB | 48 KB |
| SRAM | 4 KB | 4 KB | 6 KB | 2 KB | 1 KB | 6 KB |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| CPU Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Functional Safety (FuSa) Grade | Yes (-MFR) | No (standard grade) | No (standard grade) | No (standard grade) | No (standard grade) | Yes (-MFR) |
| Hardware Multiplier | Yes | Yes | Yes | Yes | Yes | Yes |
主要差異化特點
- Functional Safety (FuSa) documentation support (對比ATMEGA3208-MU)
- Memory headroom within the same footprint (對比ATMEGA1608-MU)
- Cost-optimized memory point in family (對比ATMEGA4808-MFR)
設計說明
The 32-VFQFN (5x5 mm) package uses a perimeter pad array with the thermal/electrical pads on the bottom side. Use a 0.5 mm pitch footprint exactly as drawn in the ATmega3208/3209 datasheet (DS40002174C) package drawing, and place thermal vias under the exposed pad tied to the ground plane for heat spreading and reliable grounding. Keep series resistors on UPDI lines short so in-circuit programming remains reliable. Since MSL rating was not verified in this dataset, follow the dry-bake and floor-life instructions printed on the reel label.
This page does not restate the supply voltage range because it was not present in the verified data - consult the datasheet DS40002174C for VDD limits and enable Microchip's brown-out detection configuration in fuses before deployment. Decouple each VDD pin pair with 100 nF ceramics placed within a few millimeters of the pins, plus bulk capacitance near the regulator. If the FuSa designation matters to your safety case, document supply supervision (BOD, external monitor) as part of the safety architecture, since a bare MCU without supervision is typically insufficient for safety functions.
Avoid two frequent mistakes when substituting within the megaAVR 0-series: (1) assuming all family members share the same peripheral count - Flash/SRAM differ across ATMEGA808/1608/3208/4808 and pin counts differ across packages (28/32 vs 40/48), so verify the pinning diagram for the 32-pin part before layout reuse; (2) treating a cross-brand 8-bit MCU as drop-in - no verified cross-brand pin-compatible equivalent for the 32-VFQFN ATmega3208 exists in the reviewed data, so substitution should stay within the Microchip family. Also note UPDI replaces classic ISP header wiring - adapt programmers accordingly.
合規資訊
Compliance status was not stated in the verified web data; confirm RoHS/REACH status on the Microchip product page or certificate of conformance before procurement.
