ATMEGA3209-AFR - 8-bit AVR 20MHz 32KB Flash MCU | Microchip
Référence : ATMEGA3209-AFR ✓ Actif| Qté | Prix unitaire | 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 Présentation
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.
Alternatives de remplacement direct pour ATMEGA3209-AFR — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ATMEGA3209-AFR (même facteur de forme et même empreinte) — différant par Package, Core Processor, Operating Temperature, Peripherals, SRAM.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA3209-AU
✅ Remplacement direct✓ En stock
$0.93 / unité
Voir la fiche technique →ATMEGA3209-MU
✅ Remplacement direct✓ En stock
$0.89 / unité
Voir la fiche technique →ATMEGA4809-AF
✅ Remplacement direct✓ En stock
$1.92 / unité
Voir la fiche technique →ATMEGA4809-MF
✅ Remplacement direct✓ En stock
$0.85 / unité
Voir la fiche technique →ATMEGA1609-AFR
✅ Remplacement direct✓ En stock
$1.87 / unité
Voir la fiche technique →ATMEGA808-AFR
✅ Remplacement direct✓ En stock
$0.79 / unité
Voir la fiche technique →ATMEGA3209-AFR Valeurs maximales et caractéristiques électriques
| 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 |
| Température de fonctionnement | -40C to +125C (industrial) |
| Boîtier | 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 |
| Type de montage | Surface Mount |
| Niveau MSL | 3 |
| Statut RoHS | Compliant |
Configuration des broches de ATMEGA3209-AFR
| Broche 1 | VDD — Digital supply voltage (1.8V-5.5V) |
| Broche 2 | GND — Ground |
| Broche 3 | PC0 — GPIO / peripheral pin (per ATmega3208/3209 datasheet) |
| Broche 4 | PC2 — GPIO / peripheral pin |
| Broche 5 | PC4 — GPIO / peripheral pin |
| Broche 6 | PC6 — GPIO / peripheral pin |
| Broche 7 | PD0 — GPIO / peripheral pin |
| Broche 8 | PD2 — GPIO / peripheral pin |
| Broche 9 | PD4 — GPIO / peripheral pin |
| Broche 10 | PD6 — GPIO / peripheral pin |
| Broche 11 | GND — Ground |
| Broche 12 | VDD — Digital supply voltage |
| Broche 13 | PA0 — GPIO / analog input / peripheral pin |
| Broche 14 | PA2 — GPIO / analog input / peripheral pin |
| Broche 15 | PA4 — GPIO / analog input / peripheral pin |
| Broche 16 | PA6 — GPIO / analog input / peripheral pin |
| Broche 17 | PB0 — GPIO / peripheral pin |
| Broche 18 | PB2 — GPIO / peripheral pin |
| Broche 19 | PB4 — GPIO / peripheral pin |
| Broche 20 | PB6 — GPIO / peripheral pin |
| Broche 21 | GND — Ground |
| Broche 22 | VDD — Digital supply voltage |
| Broche 23 | PC1 — GPIO / peripheral pin |
| Broche 24 | PC3 — GPIO / peripheral pin |
| Broche 25 | PC5 — GPIO / peripheral pin |
| Broche 26 | PC7 — GPIO / peripheral pin |
| Broche 27 | PD1 — GPIO / peripheral pin |
| Broche 28 | PD3 — GPIO / peripheral pin |
| Broche 29 | PD5 — GPIO / peripheral pin |
| Broche 30 | PD7 — GPIO / peripheral pin |
| Broche 31 | PF0 — GPIO / analog input / peripheral pin |
| Broche 32 | PF2 — GPIO / analog input / peripheral pin |
| Broche 33 | PF4 — GPIO / analog input / peripheral pin |
| Broche 34 | PF6 — GPIO / analog input / peripheral pin |
| Broche 35 | GND — Ground |
| Broche 36 | VDD — Digital supply voltage |
| Broche 37 | PA1 — GPIO / analog input / peripheral pin |
| Broche 38 | PA3 — GPIO / analog input / peripheral pin |
| Broche 39 | PA5 — GPIO / analog input / peripheral pin |
| Broche 40 | PA7 — GPIO / analog input / peripheral pin |
| Broche 41 | PB1 — GPIO / peripheral pin |
| Broche 42 | PB3 — GPIO / peripheral pin |
| Broche 43 | PB5 — GPIO / peripheral pin |
| Broche 44 | PB7 — GPIO / peripheral pin |
| Broche 45 | UPDI — Unified Program and Debug Interface (programming pin) |
| Broche 46 | RESET — Reset (active low) |
| Broche 47 | AREF — Analog reference voltage |
| Broche 48 | PF1 — GPIO / analog input / peripheral pin |
Applications typiques
ATMEGA3209-AFR convient pour 7 applications: 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA3209-AFR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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 |
Principaux différenciateurs
- 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)
Notes de conception
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.
Informations de conformité
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.
