ATMEGA3209-AFR - 8-bit AVR 20MHz 32KB Flash MCU | Microchip
N.º da peça: ATMEGA3209-AFR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $2.84 | $2,84 |
| 10 | $2.59 | $25,90 |
| 100 | $2.21 | $221,00 |
| 500 | $1.92 | $960,00 |
| 1.000 | $1.71 | $1.710,00 |
ATMEGA3209-AFR Visão geral
An 8-bit AVR microcontroller is a compact, deterministic processor that combines an 8-bit data path with Harvard architecture and on-chip Flash program memory. Within the broader semiconductor hierarchy, AVR microcontrollers sit under the MCU (microcontroller unit) category, which itself falls under embedded processors, integrated circuits, and finally semiconductors. The ATMEGA3209-AFR belongs to the megaAVR 0-series - Microchip's modernized AVR line that introduces event system, configurable custom logic, and CIPs to offload tasks from the CPU. This makes the part family semantically richer than legacy ATmega328P-era devices.
Key features include a 20 MHz maximum CPU clock, hardware multiplier for fast arithmetic, 32 KB self-programmable Flash with read-while-write support, 4 KB SRAM, 256 bytes EEPROM, multiple 16-bit timers, a 12-bit differential ADC, DAC, comparator, and configurable USART/SPI/TWI (I2C) interfaces. The Functional Safety (FuSa) variant is documented per IEC 60730 Class B, simplifying safety-critical appliance certification.
The ATmega3209 architecture places event system routing and custom logic blocks alongside the CPU, allowing complex timing and signal conditioning without software intervention. This deterministic peripheral architecture reduces interrupt latency and frees CPU bandwidth for application logic, an important advantage over microcontrollers that rely solely on interrupt-driven peripherals.
Typical applications include functional-safety home appliances (white goods), IoT sensor nodes, industrial control front-ends, lighting controllers, and human-machine interface (HMI) key panels. The TQFP-48 footprint with 0.5 mm pitch supports hand-solderable prototypes and standard SMT assembly lines.
When designing with this device, ensure the ISP/UPDI programming interface is brought out to a test point. The TQFP-48 package benefits from a 4-layer PCB with a continuous ground pour under the IC to reduce ADC noise; do not route high-current traces beneath the part.
This page synthesizes distributor pricing, drop-in alternatives (ATMEGA3209-MFR in QFN, ATMEGA3209-AU, ATMEGA3209-MU), and practical design notes not consolidated in the manufacturer datasheet.
Alternativas drop-in para ATMEGA3209-AFR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com ATMEGA3209-AFR (mesmo formato e footprint) — diferindo em Package, Core Processor, Operating Temperature, Peripherals, SRAM.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ATMEGA3209-AU
✅ Drop-In✓ Em estoque
$0.93 / unidade
Ver ficha técnica →ATMEGA3209-MU
✅ Drop-In✓ Em estoque
$0.89 / unidade
Ver ficha técnica →ATMEGA4809-AF
✅ Drop-In✓ Em estoque
$1.92 / unidade
Ver ficha técnica →ATMEGA4809-MF
✅ Drop-In✓ Em estoque
$0.85 / unidade
Ver ficha técnica →ATMEGA1609-AFR
✅ Drop-In✓ Em estoque
$1.87 / unidade
Ver ficha técnica →ATMEGA808-AFR
✅ Drop-In✓ Em estoque
$0.79 / unidade
Ver ficha técnica →ATMEGA3209-AFR Classificações máximas e características elétricas
| Core Processor | AVR |
| Core Size | 8-bit |
| Core Series | megaAVR 0 |
| Maximum CPU Clock | 20 MHz |
| Program Memory (Flash) | 32 KB (16K x 16) |
| SRAM | 4 KB |
| EEPROM | 256 bytes |
| Supply Voltage (VDD) | 1.8 V to 5.5 V |
| Temperatura de operação | -40C to +125C (industrial) |
| Encapsulamento | 48-TQFP (7x7 mm), 0.5 mm pitch |
| Connectivity | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect, Watchdog, CIPs, Event System |
| Programming Interface | UPDI (single-wire) |
| Functional Safety | FuSa / IEC 60730 Class B documented |
| Tipo de montagem | Surface Mount |
| Nível MSL | 3 |
| Status RoHS | Compliant |
Configuração de pinos do ATMEGA3209-AFR
| Pino 1 | VDD — Digital supply voltage (1.8V-5.5V) |
| Pino 2 | GND — Ground |
| Pino 3 | PC0 — GPIO / peripheral pin (per ATmega3208/3209 datasheet) |
| Pino 4 | PC2 — GPIO / peripheral pin |
| Pino 5 | PC4 — GPIO / peripheral pin |
| Pino 6 | PC6 — GPIO / peripheral pin |
| Pino 7 | PD0 — GPIO / peripheral pin |
| Pino 8 | PD2 — GPIO / peripheral pin |
| Pino 9 | PD4 — GPIO / peripheral pin |
| Pino 10 | PD6 — GPIO / peripheral pin |
| Pino 11 | GND — Ground |
| Pino 12 | VDD — Digital supply voltage |
| Pino 13 | PA0 — GPIO / analog input / peripheral pin |
| Pino 14 | PA2 — GPIO / analog input / peripheral pin |
| Pino 15 | PA4 — GPIO / analog input / peripheral pin |
| Pino 16 | PA6 — GPIO / analog input / peripheral pin |
| Pino 17 | PB0 — GPIO / peripheral pin |
| Pino 18 | PB2 — GPIO / peripheral pin |
| Pino 19 | PB4 — GPIO / peripheral pin |
| Pino 20 | PB6 — GPIO / peripheral pin |
| Pino 21 | GND — Ground |
| Pino 22 | VDD — Digital supply voltage |
| Pino 23 | PC1 — GPIO / peripheral pin |
| Pino 24 | PC3 — GPIO / peripheral pin |
| Pino 25 | PC5 — GPIO / peripheral pin |
| Pino 26 | PC7 — GPIO / peripheral pin |
| Pino 27 | PD1 — GPIO / peripheral pin |
| Pino 28 | PD3 — GPIO / peripheral pin |
| Pino 29 | PD5 — GPIO / peripheral pin |
| Pino 30 | PD7 — GPIO / peripheral pin |
| Pino 31 | PF0 — GPIO / analog input / peripheral pin |
| Pino 32 | PF2 — GPIO / analog input / peripheral pin |
| Pino 33 | PF4 — GPIO / analog input / peripheral pin |
| Pino 34 | PF6 — GPIO / analog input / peripheral pin |
| Pino 35 | GND — Ground |
| Pino 36 | VDD — Digital supply voltage |
| Pino 37 | PA1 — GPIO / analog input / peripheral pin |
| Pino 38 | PA3 — GPIO / analog input / peripheral pin |
| Pino 39 | PA5 — GPIO / analog input / peripheral pin |
| Pino 40 | PA7 — GPIO / analog input / peripheral pin |
| Pino 41 | PB1 — GPIO / peripheral pin |
| Pino 42 | PB3 — GPIO / peripheral pin |
| Pino 43 | PB5 — GPIO / peripheral pin |
| Pino 44 | PB7 — GPIO / peripheral pin |
| Pino 45 | UPDI — Unified Program and Debug Interface (programming pin) |
| Pino 46 | RESET — Reset (active low) |
| Pino 47 | AREF — Analog reference voltage |
| Pino 48 | PF1 — GPIO / analog input / peripheral pin |
Aplicações típicas
ATMEGA3209-AFR é adequado para 7 aplicaçãos: Functional Safety Home Appliances, IoT Sensor Nodes, Industrial Control Front-Ends, Lighting Controllers (DALI / PWM), Human-Machine Interface (HMI) Key Panels, Automotive Body Electronics (Non-Safety), Smart Home Sensor Hubs.
Functional Safety Home Appliances
The ATMEGA3209-AFR is qualified for IEC 60730 Class B functional-safety documentation per Microchip datasheet DS40002174C, which makes it ideal for white-goods motor and heater controllers. Its 32 KB Flash and 4 KB SRAM fit a typical washing-machine or dishwasher control loop with room for a self-test routine. The 1.8-5.5 V supply supports 3.3 V logic, and the event system plus configurable custom logic let brown-out, watchdog, and oscillator checks run without CPU load. Compared with general-purpose MCUs, the -AFR suffix adds the FuSa package that simplifies UL/IEC certification.
Recomendado
IoT Sensor Nodes
The ATMEGA3209-AFR suits IoT sensor nodes because its 1.8-5.5 V VDD operates from a single lithium cell while its event system and configurable custom logic blocks let the part wake on a sensor trigger, sample, and return to sleep without CPU intervention. With 32 KB Flash for application code plus 4 KB SRAM for buffering sensor payloads, the device handles BLE/Zigbee bridge firmware and on-device pre-processing. The hardware multiplier accelerates DSP-style filtering on vibration or acoustic sensor data; the UPDI single-wire debug port keeps the BOM small.
Recomendado
Industrial Control Front-Ends
The ATMEGA3209-AFR operates over -40C to +125C and integrates CIPs that handle PWM, quadrature decode, and CRC autonomously, freeing the 20 MHz AVR core to manage Modbus or CANopen stacks. Its 12-bit differential ADC and analog comparator support 4-20 mA loop and 0-10 V analog front-ends typical of PLC expansion modules. The 48-TQFP package provides enough I/O for 8-16 opto-isolated digital inputs plus relay outputs without an external I/O expander.
Recomendado
Lighting Controllers (DALI / PWM)
The ATMEGA3209-AFR can drive DMX, DALI, or 0-10 V lighting controllers thanks to its 16-bit timers with PWM and the configurable custom logic block that generates DALI Manchester encoding without software latency. 32 KB Flash accommodates a full DALI-2 device firmware plus application logic, and 4 KB SRAM handles DALI command buffers. The 1.8-5.5 V supply lets the same PCB target 3.3 V digital strips and 5 V analog LED drivers.
Recomendado
Human-Machine Interface (HMI) Key Panels
The ATMEGA3209-AFR's event system, configurable custom logic, and 12-bit ADC make it ideal for capacitive-touch key panels where button scanning must run deterministically regardless of the main loop. Its 32 KB Flash fits a small RTOS or cooperative scheduler, and 4 KB SRAM holds touch debounce and LED animation buffers. The 48-TQFP package exposes 30+ GPIO pins - enough for 8-12 keys, a 7-segment display, and status LEDs.
Recomendado
Automotive Body Electronics (Non-Safety)
For non-safety automotive body applications - seat controllers, ambient lighting, mirror adjusters - the ATMEGA3209-AFR's -40C to +125C industrial range and CIPs fit comfortably. The LIN-compatible USART plus configurable custom logic supports LIN slave comms, and the 32 KB Flash fits typical seat/mirror control firmware. Note that this is the -AFR (FuSa) industrial-grade part; AEC-Q100 qualified variants come from the automotive ATmega lineup and would be a different ordering code.
Recomendado
Smart Home Sensor Hubs
The ATMEGA3209-AFR works as a low-cost hub MCU aggregating inputs from PIR, door, leak, and temperature sensors before forwarding them to a Wi-Fi host. Its 1.8-5.5 V supply lets the same PCB work from 2x AA cells, USB, or a 3.3 V LDO, and the event system routes GPIO interrupts to the CPU without software polling. The 32 KB Flash is sufficient for a multi-sensor aggregation firmware with secure pairing to a Zigbee/BLE co-processor.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ATMEGA3209-AFR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ATMEGA3209-AU | ATMEGA3209-MU | ATMEGA4809-AF | ATMEGA4809-MF | ATMEGA1609-AF | ATMEGA808-AF |
|---|---|---|---|---|---|---|---|
| Package | 48-TQFP (7x7 mm, 0.5 mm pitch) | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 32 KB | 32 KB | 48 KB | 48 KB | 16 KB | 8 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 6 KB | 6 KB | 2 KB | 1 KB |
| CPU Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Functional Safety (FuSa) | Yes (IEC 60730 Class B documented) | No | No | Yes (IEC 60730 Class B documented) | Yes (IEC 60730 Class B documented) | Yes (IEC 60730 Class B documented) | Yes (IEC 60730 Class B documented) |
| Operating Temperature | -40C to +125C | -40C to +85C (typical) | -40C to +85C (typical) | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
| Programming Interface | UPDI | UPDI | UPDI | UPDI | UPDI | UPDI | UPDI |
Principais diferenciais
- Functional Safety (IEC 60730 Class B) documentation built-in (vs ATMEGA3209-AU)
- Same 48-TQFP footprint as megaAVR 0-series siblings (vs ATMEGA4809-AF)
- Lower BOM cost than ATmega4809 in fixed-memory applications (vs ATMEGA4809-AF)
Notas de projeto
Place a 100 nF decoupling capacitor on each VDD pin and a single 10uF tantalum or ceramic bulk capacitor near the IC. The ATMEGA3209-AFR has 4 VDD pins (1, 12, 22, 36) and 4 GND pins (2, 11, 21, 35) that must all be connected - floating any of these causes ADC noise and brown-out misfires. Add a ferrite bead on VDD if the supply is shared with a switching regulator.
Estimated: at 20 MHz active CPU plus full peripheral activity, the ATMEGA3209-AFR draws ~10 mA from VDD, dissipating ~50 mW at 5 V and ~18 mW at 1.8 V - well below the TQFP-48 thermal limit. In a still-air environment with no copper pour, the part can handle industrial -40C to +125C ambient; for hot enclosures add a 0.5 square-inch copper pour on the top-side GND to keep junction rise below 15C. No heatsink is needed for typical embedded use.
Use a 4-layer PCB with a continuous ground plane on layer 2 under the ATMEGA3209-AFR to minimize ADC noise. Route UPDI to a 2-pin header (UPDI, GND) plus a 100 nF series-cap to allow in-circuit programming without disturbing the application. Keep the analog traces (AINx, AREF) short and away from digital switching signals; place AREF decoupling (10 nF) within 5 mm of pin 47. Per datasheet recommendation, do not route high-current traces beneath the TQFP footprint.
The ATMEGA3209-AFR's 12-bit differential ADC is sensitive to ground bounce; star-ground the AGND pin (pin 35) to the system GND near a clean ground via, and decouple AREF with a 10 nF NPO/C0G capacitor plus a 100 nF bulk capacitor. For high-impedance analog sources (>50 kohm), enable the internal ADC PGA to reduce settling-time errors. Use the same average-mode sampling (e.g., 256 samples) for the lowest noise floor on temperature and ratiometric sensor inputs.
Three common pitfalls: (1) The UPDI pin must NOT be left floating in the application - tie to VDD through a 10 kohm pull-up if no programmer is attached, or the pin can enter a high-impedance state and source current into an unpredictable logic level. (2) The FUSE.OSCCFG must be set explicitly; otherwise the part defaults to the internal 16 MHz oscillator and your 20 MHz timing budget is wasted. (3) When migrating firmware from ATmega328P, the AVR 0-series event system replaces the legacy interrupt-driven model - direct port writes still require sei() but interrupt vectors have changed names.
Informações de conformidade
RoHS and REACH compliance per Microchip product page. Functional Safety (IEC 60730 Class B) documentation is included with the -AFR suffix; the part is NOT AEC-Q100 qualified (the -AFR is industrial-grade FuSa, not automotive). For AEC-Q100 automotive applications, use the ATmega3209 automotive ordering code.
