ATMEGA3209-AUR - 20MHz 32KB AVR MCU, TQFP-48 | Microchip
N.º de pieza: ATMEGA3209-AUR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $2.85 | $2,85 |
| 10 | $2.52 | $25,20 |
| 100 | $2.18 | $218,00 |
| 500 | $1.94 | $970,00 |
| 1.000 | $1.72 | $1.720,00 |
ATMEGA3209-AUR Descripción general
A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, data memory, and programmable I/O peripherals. The ATmega3209 belongs to the megaAVR 0-series, which targets low-power and functional-safety embedded designs, sitting in the broader hierarchy of microcontrollers -> microprocessors -> semiconductors. Compared to traditional AVR (e.g., ATmega328P) parts, the megaAVR 0-series uses a modernized core with Core Independent Peripherals (CIPs) for offloading tasks from the CPU.
Key features include 32 KB in-system programmable Flash with read-while-write support, 4 KB SRAM, hardware multiplier for fast arithmetic, multiple 16-bit Timer/Counters, a 12-bit-configurable 10-bit ADC, and configurable custom logic. The integrated peripheral touch controller, event system, and CRC hardware accelerator support low-latency deterministic responses for safety-critical and Human-Machine Interface (HMI) applications. The device also includes a windowed watchdog timer and voltage-level BOD.
Technically, the ATmega3209-AUR uses a 2-stage pipelined Harvard architecture with separate program/data buses and a 3-channel event system for inter-peripheral signaling without CPU intervention. Its low-power Sleep modes (Idle, Standby, Power-Down, Power-Save) achieve quiescent currents down to single-digit microamps when peripheral clocks are gated, and the integrated Core Independent Peripherals (CIPs) can wake the core only when needed - delivering reduced average power consumption over legacy AVR designs.
Typical applications include industrial sensor nodes, building automation controllers, low-power IoT edge nodes, functional-safety subsystems, white-goods and consumer HMI, and battery-powered portable instruments. Designers often pair the ATmega3209 with a low-power sensor and a wireless transceiver such as an SPI-controlled sub-GHz or BLE module for cloud-connected telemetry.
When designing with this part, ensure decoupling of VDD and AVCC with at least 100 nF each placed within 2 mm of the supply pins, and route the analog/digital grounds as a star connection to minimize ADC noise. For functional-safety firmware, use the integrated windowed watchdog and the CRC peripheral to detect runaway code paths.
This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, helping engineers shorten the BOM selection and PCB layout phases for ATmega3209-based designs.
Alternativas directas para ATMEGA3209-AUR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ATMEGA3209-AUR (mismo factor de forma y huella) — difiere en Core Processor, Operating Temperature, Peripherals, Series, Packaging.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ATMEGA4809-AUR
✅ Sustitución directa✓ En stock
$1.74 / unidad
Ver hoja de datos →ATMEGA3208-AUR
✅ Sustitución directa✓ En stock
$0.94 / unidad
Ver hoja de datos →ATMEGA1609-AUR
✅ Sustitución directa✓ En stock
$1.51 / unidad
Ver hoja de datos →ATMEGA4808-AUR
✅ Sustitución directa✓ En stock
$1.98 / unidad
Ver hoja de datos →ATMEGA808-AUR
✅ Sustitución directa✓ En stock
$1.09 / unidad
Ver hoja de datos →ATMEGA3209-AUR Valores máximos y características eléctricas
| Core Processor | AVR 8-bit |
| Core Size | 8-Bit |
| Series | megaAVR 0 |
| Maximum Clock Speed | 20 MHz |
| Program Memory (Flash) | 32 KB |
| SRAM | 4 KB |
| EEPROM | 256 bytes |
| Supply Voltage (VDD) | 1.8 V to 5.5 V |
| Temperatura de funcionamiento | -40°C to +85°C |
| Encapsulado | 48-pin TQFP (7x7 mm) |
| Tipo de montaje | Surface Mount (Tape & Reel) |
| ADC | 10-bit, multiple channels |
| Connectivity | I²C, SPI, UART/USART |
| Peripherals | Brown-out Detect, Watchdog, PWM, Timer |
| Hardware Multiplier | Yes |
| Estado RoHS | Compliant |
| Nivel MSL | 3 |
Configuración de pines de ATMEGA3209-AUR
| Pin 1 | PA6 — Port A bit 6 (GPIO/ADC) |
| Pin 2 | PA7 — Port A bit 7 (GPIO/ADC) |
| Pin 3 | AGND — Analog ground |
| Pin 4 | AVCC — Analog supply voltage |
| Pin 5 | VDD — Digital supply voltage |
| Pin 6 | GND — Digital ground |
| Pin 7 | PC0 — Port C bit 0 (GPIO) |
| Pin 8 | PC1 — Port C bit 1 (GPIO) |
| Pin 9 | PC2 — Port C bit 2 (GPIO) |
| Pin 10 | PC3 — Port C bit 3 (GPIO) |
| Pin 11 | UPDI — Unified Program and Debug Interface |
| Pin 12 | PD0 — Port D bit 0 (GPIO) |
| Pin 13 | PD1 — Port D bit 1 (GPIO) |
| Pin 14 | PD2 — Port D bit 2 (GPIO) |
| Pin 15 | PD3 — Port D bit 3 (GPIO) |
| Pin 16 | PD4 — Port D bit 4 (GPIO) |
| Pin 17 | PD5 — Port D bit 5 (GPIO) |
| Pin 18 | PD6 — Port D bit 6 (GPIO) |
| Pin 19 | PD7 — Port D bit 7 (GPIO) |
| Pin 20 | PE0 — Port E bit 0 (GPIO/ADC) |
| Pin 21 | PE1 — Port E bit 1 (GPIO/ADC) |
| Pin 22 | PE2 — Port E bit 2 (GPIO/ADC) |
| Pin 23 | PE3 — Port E bit 3 (GPIO/ADC) |
| Pin 24 | PF0 — Port F bit 0 (GPIO) |
| Pin 25 | PF1 — Port F bit 1 (GPIO) |
| Pin 26 | PF2 — Port F bit 2 (GPIO) |
| Pin 27 | PF3 — Port F bit 3 (GPIO) |
| Pin 28 | PF4 — Port F bit 4 (GPIO) |
| Pin 29 | PF5 — Port F bit 5 (GPIO) |
| Pin 30 | PF6 — Port F bit 6 (GPIO) |
| Pin 31 | PA0 — Port A bit 0 (GPIO/ADC) |
| Pin 32 | PA1 — Port A bit 1 (GPIO/ADC) |
| Pin 33 | PA2 — Port A bit 2 (GPIO/ADC) |
| Pin 34 | PA3 — Port A bit 3 (GPIO/ADC) |
| Pin 35 | PA4 — Port A bit 4 (GPIO/ADC) |
| Pin 36 | PA5 — Port A bit 5 (GPIO/ADC) |
| Pin 37 | PB0 — Port B bit 0 (GPIO) |
| Pin 38 | PB1 — Port B bit 1 (GPIO) |
| Pin 39 | PB2 — Port B bit 2 (GPIO) |
| Pin 40 | PB3 — Port B bit 3 (GPIO) |
| Pin 41 | PB4 — Port B bit 4 (GPIO) |
| Pin 42 | PB5 — Port B bit 5 (GPIO) |
| Pin 43 | PC4 — Port C bit 4 (GPIO) |
| Pin 44 | PC5 — Port C bit 5 (GPIO) |
| Pin 45 | PC6 — Port C bit 6 (GPIO) |
| Pin 46 | PC7 — Port C bit 7 (GPIO) |
| Pin 47 | RESET — Reset input (active low) |
| Pin 48 | VCC — Digital supply voltage |
Aplicaciones típicas
ATMEGA3209-AUR es adecuado para 6 aplicacións: Industrial Sensor Node, Building Automation Controller, Battery-Powered IoT Edge Node, Functional-Safety Subsystem, White-Goods HMI Front Panel, Portable Medical Instrument.
Industrial Sensor Node
The ATMEGA3209-AUR fits industrial 4-20 mA loop-powered sensor nodes because its 1.8 V to 5.5 V supply range covers both loop-excitation and 24 V bus regulation rails, while its 10-bit ADC samples transducer signals directly without external signal chains. Place 100 nF decoupling on VDD and AVCC within 2 mm of the pins to keep ADC noise below 1 LSB; route analog/digital grounds as a star connection to the AGND pin. Compared to legacy ATmega48/88 designs, the megaAVR 0-series event system lets the ADC trigger a peripheral write without CPU intervention, dropping average active current below 1 mA.
Recomendado
Building Automation Controller
The ATMEGA3209-AUR is well suited to BACnet or KNX-compatible building automation controllers because its 32 KB Flash holds the full HVAC state machine, while its multiple USART channels drive isolated RS-485 transceivers for field-bus communication. The 16-bit Timer/Counters generate precise PWM for valve and damper actuators, and the windowed watchdog timer satisfies IEC 60730 functional-safety requirements for household appliances. Compared to ARM Cortex-M0 designs, the AVR instruction set keeps deterministic interrupt latency for hard real-time HVAC control loops.
Recomendado
Battery-Powered IoT Edge Node
The ATMEGA3209-AUR fits battery-powered IoT edge nodes because its Power-Down Sleep mode drops quiescent current to single-digit microamps while retaining RAM and interrupt wake-up - per Microchip ATmega3208-3209 datasheet. The event system can wake the CPU only on a sensor threshold breach from the ADC or comparator, avoiding continuous polling that drains coin-cell batteries. Pair with a low-power SPI sensor and a sub-GHz or BLE transceiver for cloud telemetry, and use the integrated CIPs to offload CRC and timer tasks from the AVR core.
Recomendado
Functional-Safety Subsystem
The ATMEGA3209-AUR supports functional-safety subsystems because it integrates a windowed watchdog timer, configurable BOD (Brown-Out Detector), and CRC hardware accelerator that together detect runaway code paths and clock-glitch events - per Microchip ATmega3208-3209 datasheet. The dual-window WDT catches both stuck-too-fast and stuck-too-slow faults, while the event system isolates safety-critical peripherals from CPU latency. Use the part in IEC 61508 SIL-2 class sensor monitoring, in conjunction with an external windowed supervisor for full SIL coverage.
Recomendado
White-Goods HMI Front Panel
The ATMEGA3209-AUR drives white-goods HMI front panels because its hardware multiplier accelerates capacitive-touch decoding and LED-segment multiplexing, while the 41 I/O pins support direct drive of 7-segment displays and button matrices without external glue logic. The Core Independent Peripherals handle PWM dimming and debouncing in hardware, freeing the CPU for the user-interface state machine. Use it in washing-machine, induction-cooktop, and refrigerator control panels where reliable touch response and low standby current are required.
Recomendado
Portable Medical Instrument
The ATMEGA3209-AUR fits portable medical instruments such as glucose meters and pulse oximeters because its wide 1.8 V to 5.5 V supply range accepts a single Li-ion or two-AA battery source without boost regulators, while its low Sleep-mode current extends battery life past 1 year on standby. The 10-bit ADC samples optical or electrochemical sensor signals with sub-1 LSB noise when the AGND star-ground layout is respected. The hardware multiplier accelerates moving-average and FFT algorithms used in biosignal conditioning, and the integrated CRC peripheral protects firmware integrity.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ATMEGA3209-AUR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ATMEGA4809-AUR | ATMEGA3208-AUR | ATMEGA1609-AUR | ATMEGA4808-AUR | ATMEGA808-AUR |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-TQFP (7x7) | 48-TQFP (7x7) - same | 48-TQFP (7x7) - same | 48-TQFP (7x7) - same | 48-TQFP (7x7) - same | 48-TQFP (7x7) - same |
| Core / Architecture | AVR 8-bit (megaAVR 0) | AVR 8-bit (megaAVR 0) | AVR 8-bit (megaAVR 0) | AVR 8-bit (megaAVR 0) | AVR 8-bit (megaAVR 0) | AVR 8-bit (megaAVR 0) |
| Max Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Flash Memory | 32 KB | 48 KB (+50%) | 32 KB (same) | 16 KB (-50%) | 48 KB (+50%) | 8 KB (-75%) |
| SRAM | 4 KB | 6 KB (+50%) | 4 KB (same) | 4 KB (same) | 6 KB (+50%) | 2 KB (-50%) |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| 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 |
Diferenciadores clave
- Optimal Flash/SRAM balance for cost-sensitive embedded designs (frente a ATMEGA4809-AUR)
- Full 41 GPIO count vs reduced-pin variant (frente a ATMEGA3208-AUR)
- Integrated Core Independent Peripherals and event system for offloading tasks (frente a ATMEGA4809-AUR)
Notas de diseño
Decouple VDD and AVCC with at least 100 nF X7R ceramic capacitors placed within 2 mm of the supply pins, plus a bulk 10 µF tantalum/polymer capacitor at the IC supply entry point. The AVCC pin powers the ADC and should be filtered from VDD with a ferrite bead or 10 Ω resistor to suppress digital switching noise; failure to do this can degrade ADC SNR by 5-10 dB in mixed-signal designs.
Route analog and digital grounds as a star connection to the AGND pin rather than a split plane. The TQFP-48 7x7 mm footprint requires 0.5 mm pitch traces - keep at least 0.2 mm clearance between adjacent traces and use a 4-layer stackup with a continuous ground plane beneath the IC to provide thermal spreading and reference plane for high-speed signals.
Do not leave the UPDI pin floating during normal operation; tie it to VDD through a 10 kΩ resistor if not used for programming. The megaAVR 0-series fuses require explicit configuration to enable the RESET pin as GPIO (RSTPINCFG) - failing to program this fuse disables PA0 reset behavior. Always set the BODLEVEL fuse to a value within your supply rail tolerance to prevent Flash corruption during VDD droops.
Información de cumplimiento
RoHS compliant per Mouser and DigiKey listings. Not AEC-Q100 qualified; for automotive, use AEC-Q100 equivalent ATmega3209 variants or upgrade to ATMEGA3209-AFR with extended temperature.
