ATMEGA3208-XFR - 8-bit AVR MCU 20MHz 32KB Flash | Microchip
Référence : ATMEGA3208-XFR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1 000 | $0 | $0,00 |
ATMEGA3208-XFR Présentation
An 8-bit AVR microcontroller is a single-chip computer that integrates a RISC processor core, program Flash, data SRAM, EEPROM, and peripherals such as UARTs, SPI, I2C (TWI), timers, and an ADC on one die. Within the power-management hierarchy of embedded systems, the MCU sits at the top level of control, orchestrating sensors, actuators, and communication links. The AVR architecture, originally developed by Atmel and now part of Microchip Technology, executes most instructions in a single clock cycle.
Key features of the ATMEGA3208-XFR include the 20 MHz maximum clock frequency for deterministic real-time response, the 32 KB (16K x 16) self-programmable Flash for firmware headroom, and the megaAVR 0 series peripheral set with event system, configurable custom logic (CCL), and functional-safety (FuSa) support documentation. The XFR suffix denotes the 28-SSOP (5.30 mm width) package, industrial 125C temperature grade, Green/RoHS-compliant finish, and Tape & Reel packing for automated assembly.
Technically, the AVR core pairs a two-stage pipeline with a hardware multiplier, enabling efficient 8-bit and 16-bit arithmetic, while the peripheral ring and event system allow peripherals to communicate without CPU intervention, reducing latency and power. Single-cycle I/O register access keeps bit-banged protocols fast and predictable.
Typical applications include industrial sensor nodes and factory automation, home-appliance and HVAC control boards, and low-cost motor control or power-supply supervision, where 20 MHz performance and 32 KB Flash cover most 8-bit workloads.
A key design consideration is supply decoupling: place 100 nF ceramic capacitors directly at the VDD pin and use the internal brown-out detector for reliable reset behavior across the 1.8 V to 5.5 V supply range.
This page synthesizes distributor availability, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternatives de remplacement direct pour ATMEGA3208-XFR — 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 ATMEGA3208-XFR (même facteur de forme et même empreinte) — différant par Series, Core Processor, Package, Flash Memory, SRAM.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA4808-XFR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATMEGA1608-XFR
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$0.66 / unité
Voir la fiche technique →ATMEGA808-XFR
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ATMEGA3208-XU
✅ Remplacement direct✓ En stock
$0.84 / unité
Voir la fiche technique →ATMEGA4808-XU
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATMEGA3208-XFR Valeurs maximales et caractéristiques électriques
| Core Processor | AVR 8-bit with hardware multiplier |
| Core Size | 8-bit |
| Max Clock Frequency | 20 MHz |
| Flash Memory | 32 KB (16K x 16) |
| SRAM | 4 KB |
| EEPROM | 256 bytes |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Température de fonctionnement | -40C to +125C |
| Boîtier | 28-SSOP (0.209", 5.30 mm width) |
| Type de montage | Surface Mount |
| Series | megaAVR 0 (Functional Safety / FuSa) |
| Packaging | Tape & Reel (T&R) |
| Statut RoHS | Green / RoHS compliant |
| Nombre de broches | 28 |
| Program Memory Type | FLASH |
Configuration des broches de ATMEGA3208-XFR
| Broche 1 | VDD — Power supply (1.8 V to 5.5 V) |
| Broche 2 | GND — Ground |
| Broche 3 | PA0 — GPIO / UPDI (default) / analog |
| Broche 4 | PA1 — GPIO / analog |
| Broche 5 | PA2 — GPIO / analog |
| Broche 6 | PA3 — GPIO / analog |
| Broche 7 | PA4 — GPIO / analog |
| Broche 8 | PA5 — GPIO / analog |
| Broche 9 | PA6 — GPIO / analog |
| Broche 10 | PA7 — GPIO / RESET (alternative) |
| Broche 11 | PB0 — GPIO / analog |
| Broche 12 | PB1 — GPIO / analog |
| Broche 13 | PB2 — GPIO / analog |
| Broche 14 | PB3 — GPIO / analog |
| Broche 15 | PB4 — GPIO / analog |
| Broche 16 | PB5 — GPIO / analog |
| Broche 17 | PC0 — GPIO / analog |
| Broche 18 | PC1 — GPIO / analog |
| Broche 19 | PC2 — GPIO / analog |
| Broche 20 | PC3 — GPIO / analog |
| Broche 21 | PC4 — GPIO / analog |
| Broche 22 | PC5 — GPIO / analog |
| Broche 23 | PC6 — GPIO / analog |
| Broche 24 | PC7 — GPIO / analog |
| Broche 25 | PD0 — GPIO / analog |
| Broche 26 | PD1 — GPIO / analog |
| Broche 27 | PD2 — GPIO / analog |
| Broche 28 | PD3 — GPIO / analog |
Applications typiques
ATMEGA3208-XFR convient pour 6 applications: Industrial Sensor Nodes, Home Appliance and HVAC Control, Motor Control and Power Supervision, IoT Edge Nodes and Smart Home Devices, Automotive Body and Auxiliary Electronics, Test, Measurement and Developer Boards.
Industrial Sensor Nodes
The ATMEGA3208-XFR fits industrial sensor nodes because its -40C to +125C industrial rating, 32 KB Flash, and 4 KB SRAM cover the calibration tables, filtering buffers, and protocol stacks typical of distributed I/O. The megaAVR 0 event system routes ADC conversion-complete and timer events directly between peripherals without CPU intervention, so a periodic sampling loop runs with deterministic latency even at modest clock rates, saving power in battery or 24 V loop-powered nodes. Placed as the node controller, the MCU services a UART or I2C link to the plant network while the CCL configurable logic handles simple gating tasks in hardware. The 20 MHz core with hardware multiplier executes fixed-point scaling math quickly, and the 256-byte EEPROM stores node identity and calibration constants that survive power cycles without external memory.
Recommandé
Home Appliance and HVAC Control
White-goods and HVAC control boards benefit from the ATMEGA3208-XFR's combination of 125C industrial temperature rating and 28-SSOP small-footprint packaging, which suits densely populated control PCBs inside compressors, fans, and heat exchangers. The 32 KB Flash holds PID control loops, user-interface state machines, and safety interlock code with headroom for OTA-style firmware updates through self-programmable Flash. Timers generate PWM for triac, relay, or BLDC driver control, while the 10-bit ADC class of converters in the megaAVR 0 family reads NTC thermistors and potentiometers across the 1.8 V to 5.5 V supply range. The internal brown-out detector keeps reset behavior safe during mains dips, and the UPDI single-wire interface allows in-field reprogramming through a single test point, reducing service cost on high-volume appliance production lines.
Recommandé
Motor Control and Power Supervision
For low-cost BLDC fan, pump, and actuator control, the ATMEGA3208-XFR offers a 20 MHz AVR core with hardware multiplier for commutation and FOC-style fixed-point arithmetic, plus timer PWM outputs that drive external gate drivers directly. The megaAVR 0 peripheral set's event system couples comparator or ADC events to timer actions with sub-microsecond latency, enabling overcurrent cutoff in hardware rather than in software. The 4 KB SRAM accommodates control-loop state and commutation tables while the 32 KB Flash leaves room for diagnostic logging in EEPROM or Flash. Its -40C to +125C rating suits enclosed motor housings where ambient temperatures climb, and the 28-SSOP footprint keeps gate-drive and sensing circuitry compact on the same control board around the MCU.
Recommandé
IoT Edge Nodes and Smart Home Devices
Battery-powered IoT edge nodes use the ATMEGA3208-XFR for its low active power at reduced clock rates, 256-byte EEPROM for device identity, and sufficient 32 KB Flash for a sensor driver plus a lightweight network protocol. The megaAVR 0 sleep modes and peripheral event system let the MCU spend most of its life in standby while a timer or pin-change event wakes it to sample and transmit, which is the dominant duty cycle in smart-home sensors. Running the UART or SPI link to a radio module such as an ATWINC or LoRa transceiver is straightforward from the hardware serial peripherals, and the 20 MHz maximum clock gives burst performance for packet assembly or CRC computation. The industrial 125C grade also tolerates enclosures exposed to direct sunlight, where consumer-grade parts would drift out of specification.
Recommandé
Automotive Body and Auxiliary Electronics
Non-safety-critical automotive auxiliary modules - seat memory, lighting control, mirror adjustment - can leverage the ATMEGA3208-XFR's -40C to +125C industrial range, which overlaps typical passenger-compartment and near-engine requirements. Note that this commercial grade is not AEC-Q100 qualified, so it should be used only where the end customer permits industrial-grade parts. The 20 MHz AVR core with hardware multiplier runs LIN-protocol software stacks, while timer PWM channels drive LED loads and lamp diagnostics through external drivers. The 32 KB Flash and 4 KB SRAM hold DTC logs and configuration sets, with EEPROM preserving calibration across battery disconnects. The single-wire UPDI interface simplifies end-of-line programming with a single pad, reducing connector count in cost-sensitive automotive Tier-2 assemblies built around this MCU.
Recommandé
Test, Measurement and Developer Boards
Bench instruments, dongles, and developer boards adopt the ATMEGA3208-XFR because the megaAVR 0 family has mature open-source support, including the MegaCoreX Arduino hardware package on GitHub that covers ATmega3208, ATmega3209, ATmega4808/4809, and smaller siblings. The 20 MHz core with single-cycle I/O makes bit-banged protocols and precise pulse timing predictable, a key requirement for measurement front-ends. The 32 KB Flash accommodates command interpreters, USB-serial bridging logic, and calibration routines, while the 10-bit ADC class of converters and analog comparators handle signal qualification. The 28-SSOP XFR Tape & Reel packing suits automated assembly of volume test fixtures, and the UPDI single-pin debug interface keeps probe access to one via on crowded fixture PCBs, lowering fixture complexity and cost.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA3208-XFR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATMEGA4808-XFR | ATMEGA1608-XFR | ATMEGA808-XFR | ATMEGA3208-XU | ATMEGA4808-XU |
|---|---|---|---|---|---|---|
| Package | 28-SSOP (5.30 mm width) | 28-SSOP (5.30 mm width) - same | 28-SSOP (5.30 mm width) - same | 28-SSOP (5.30 mm width) - same | 28-SSOP (5.30 mm width) - same | 28-SSOP (5.30 mm width) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB (16K x 16) | 48 KB | 16 KB | 8 KB | 32 KB | 48 KB |
| SRAM | 4 KB | 6 KB | 2 KB | 1 KB | 4 KB | 6 KB |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 128 bytes | 256 bytes | 256 bytes |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Temperature | -40C to +125C (Ind) | -40C to +125C (Ind) | -40C to +125C (Ind) | -40C to +125C (Ind) | -40C to +105C (XU grade) - confirm on PO | -40C to +105C (XU grade) - confirm on PO |
| Pin Compatibility | megaAVR 0 28-pin map | Pin-to-pin compatible | Pin-to-pin compatible | Pin-to-pin compatible | Pin-to-pin compatible | Pin-to-pin compatible |
Principaux différenciateurs
- Best price-to-memory balance in the 28-pin megaAVR 0 line (vs ATMEGA4808-XFR)
- More headroom than 16 KB alternatives (vs ATMEGA1608-XFR)
- Industrial 125C grade with Tape & Reel for automated assembly (vs ATMEGA3208-XU)
Notes de conception
Decouple the ATMEGA3208-XFR supply with a 100 nF X7R ceramic capacitor placed within 2 mm of the VDD pin, plus a 4.7 uF to 10 uF bulk capacitor per board section. Enable the internal brown-out reset (BOR) at a threshold matched to your regulator's dropout so that Flash writes are never interrupted by a sagging rail - a corrupted self-programming cycle can brick the 32 KB Flash. Estimated: at 20 MHz and 5 V, active current is in the low-mA range per the datasheet, so a small LDO suffices; verify against the current-versus-voltage/frequency graph in the ATmega3208/3209 datasheet.
Keep the UPDI trace short and route it away from PWM or clock lines; UPDI programming shares a pin with a GPIO, so add a series resistor (typically 470 ohm to 1 kohm, per Microchip application guidance for UPDI) and a single test pad for fixture programming. Avoid loading the UPDI pin with pull-ups that could fight the programmer. For the 28-SSOP leadframe, thermal relief is rarely needed, but connect unused GPIO to defined levels (pull-up enabled internally) to prevent floating-input oscillation and excess current draw in sleep modes.
The XFR suffix encodes temperature grade and packing - do not substitute an ATMEGA3208-XU on a purchase order without confirming its grade data sheet values, since order-code qualifiers carry temperature and packing meaning in Microchip part numbering. Second pitfall: megaAVR 0 peripherals are clocked from TCA/TCB and can be remapped to alternate pins via PORTMUX registers; a bit-banged or PWM signal that 'disappears' is usually a default PORTMUX route issue. Finally, EEPROM endurance is finite - wear-level calibration writes if they occur frequently.
Informations de conformité
Distributor listing describes the ATMEGA3208-XFR as 'SSOP28, Ind 125C, Green, T&R' - Green denotes Microchip's RoHS-compliant, lead-free finishing. Not an AEC-Q100 automotive-qualified ordering code; REACH and conflict-minerals status not stated in provided data.
