ATMEGA3208-AFR - 8-bit AVR MCU 32KB 20MHz TQFP-32 | Microchip
料号： ATMEGA3208-AFR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.78 | $2.78 |
| 10 | $2.5 | $25.00 |
| 100 | $2.14 | $214.00 |
| 500 | $1.86 | $930.00 |
| 1,000 | $1.62 | $1,620.00 |
ATMEGA3208-AFR 概述
A microcontroller (MCU) is a single-chip embedded computer that combines a processor core, memory, and peripherals on one die. The megaAVR 0-series sits in Microchip's 8-bit AVR hierarchy - processor -> AVR core -> megaAVR family -> megaAVR 0-series - positioned between cost-optimized tinyAVR parts and performance-oriented ATmega4809-class devices, targeting embedded control in industrial, consumer and automotive-adjacent systems.
Key features include the modern AVR CPU with a two-stage pipeline and single-cycle hardware multiplier, up to 20 MHz operation from an internal or external clock, and rich analog integration. Peripherals include USARTs, SPI and TWI (I2C) serial interfaces, a 10-bit ADC with up to 10 channels, 10-bit DAC, analog comparators, and configurable custom logic peripheral (CCL). Core-independent peripherals driven by the event system reduce CPU load and interrupt latency in real-time designs.
Technical depth: the megaAVR 0-series uses the latest AVR core with a 3-stage pipeline, executing most instructions in a single cycle. MVIO (multi-voltage I/O) on select pins allows the I/O bank to run at a lower voltage than VDD, simplifying mixed-voltage designs. The configurable custom logic peripheral enables glue-logic replacement, and the event system routes peripheral signals without CPU intervention. Program and debug occur over the single-wire UPDI interface, freeing pins otherwise used by JTAG or ICSP.
Typical applications include industrial control and sensor nodes, building automation and HVAC control, consumer appliances, and motor control辅助 circuits where the hardware multiplier and 10-bit ADC support scalar motor algorithms and analog sensing.
Design consideration: budget Flash and SRAM carefully - 32 KB Flash with no external expansion means bootloader space (optional unified bootloader) must be reserved at link time, and 4 KB SRAM is the hard ceiling for stack plus heap.
This page synthesizes distributor pricing, same-family drop-in alternatives, pinout data, and practical design notes not found in a single manufacturer datasheet view.
直接替换替代料： ATMEGA3208-AFR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATMEGA3208-AFR （相同外形与封装尺寸） ——差异在于 Core Processor, Series, Packaging, Flash Memory Size, Operating Temperature.
快速对比工具——选择替代料号进行并排对比：
ATMEGA4808-AFR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.72 / 个
查看数据手册 →ATMEGA1608-AFR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.81 / 个
查看数据手册 →ATMEGA3208-AUR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.94 / 个
查看数据手册 →ATMEGA3208-AF
✅ 直接替换✓ 有现货
$1.86 / 个
查看数据手册 →ATMEGA4808-AUR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.98 / 个
查看数据手册 →ATMEGA3208-AFR 最大额定值与电气特性
| Core Processor | AVR (megaAVR 0-series, 8-bit) |
| Core Size | 8-bit |
| Speed | 20 MHz |
| Flash Memory | 32 KB (32K x 8) |
| SRAM | 4 KB (4K x 8) |
| EEPROM | 256 bytes |
| Supply Voltage (VDD) | 1.8 V to 5.5 V |
| ADC Resolution | 10-bit |
| DAC Resolution | 10-bit |
| Communication Interfaces | USART, SPI, TWI (I2C) |
| Hardware Multiplier | Yes |
| Programming Interface | UPDI (Unified Program and Debug Interface) |
| 工作温度 | -40C to +105C |
| 封装 | 32-TQFP (7x7 mm) |
| 安装类型 | Surface Mount |
| Functional Safety | FuSa (Functional Safety) supporting variant |
| 引脚数量 | 32 |
| Packaging | Tape & Reel (R suffix) |
| RoHS 状态 | Compliant |
ATMEGA3208-AFR 引脚配置
| 引脚 1 | VDD — Power supply (1.8 V to 5.5 V) |
| 引脚 2 | GND — Ground |
| 引脚 3 | PB5 — Port B bit 5, digital I/O with alternate functions |
| 引脚 4 | PB4 — Port B bit 4, digital I/O with alternate functions |
| 引脚 5 | PB3 — Port B bit 3, digital I/O with alternate functions |
| 引脚 6 | PB2 — Port B bit 2, digital I/O with alternate functions |
| 引脚 7 | PB1 — Port B bit 1, digital I/O with alternate functions |
| 引脚 8 | PB0 — Port B bit 0, digital I/O with alternate functions |
| 引脚 9 | PB7 — Port B bit 7, digital I/O with alternate functions |
| 引脚 10 | PB6 — Port B bit 6, digital I/O with alternate functions |
| 引脚 11 | PA0 — Port A bit 0 - UPDI (Unified Program and Debug Interface) / digital I/O |
| 引脚 12 | PA1 — Port A bit 1, digital I/O with analog alternate functions |
| 引脚 13 | PA2 — Port A bit 2, digital I/O with analog alternate functions |
| 引脚 14 | PA3 — Port A bit 3, digital I/O with analog alternate functions |
| 引脚 15 | PA4 — Port A bit 4, digital I/O with analog alternate functions |
| 引脚 16 | PA5 — Port A bit 5, digital I/O with analog alternate functions |
| 引脚 17 | PA6 — Port A bit 6, digital I/O with analog alternate functions |
| 引脚 18 | PA7 — Port A bit 7, digital I/O with analog alternate functions |
| 引脚 19 | VDDIO2 — Independent supply for MVIO Port C bank (multi-voltage I/O) |
| 引脚 20 | PC0 — Port C bit 0 (MVIO bank), digital I/O |
| 引脚 21 | PC1 — Port C bit 1 (MVIO bank), digital I/O |
| 引脚 22 | PC2 — Port C bit 2 (MVIO bank), digital I/O |
| 引脚 23 | PC3 — Port C bit 3 (MVIO bank), digital I/O |
| 引脚 24 | PC4 — Port C bit 4 (MVIO bank), digital I/O |
| 引脚 25 | PC5 — Port C bit 5 (MVIO bank), digital I/O |
| 引脚 26 | PC6 — Port C bit 6 (MVIO bank), digital I/O |
| 引脚 27 | PD0 — Port D bit 0, digital I/O with alternate functions |
| 引脚 28 | PD1 — Port D bit 1, digital I/O with alternate functions |
| 引脚 29 | PD2 — Port D bit 2, digital I/O with alternate functions |
| 引脚 30 | PD3 — Port D bit 3, digital I/O with alternate functions |
| 引脚 31 | PD4 — Port D bit 4, digital I/O with alternate functions |
| 引脚 32 | PD5 — Port D bit 5, digital I/O with alternate functions |
典型应用
ATMEGA3208-AFR 适用于 6 应用s: Industrial Control and Automation Nodes, Building Automation and HVAC Control, Consumer Appliances, Sensor Nodes and IoT End Points, Small Motor Control, Test, Measurement and Instrumentation Front Ends.
Industrial Control and Automation Nodes
The ATMEGA3208-AFR fits industrial control nodes because its -40C to +105C operating range exceeds typical industrial ambient requirements and its 1.8 V to 5.5 V supply tolerates noisy factory power rails. The 10-bit ADC with up to 10 channels digitizes analog sensor inputs such as 4-20 mA-conditioned signals and thermistor feedback, while the event system and configurable custom logic (CCL) handle fast reactions - like gating a PWM output on a comparator trip - without CPU intervention, reducing worst-case latency. USART, SPI and TWI interfaces link the MCU to PLC backplanes, displays and external memory. Placed in a 32-pin TQFP, it offers 22+ GPIO in 7x7 mm for relay drivers, indicator LEDs and keypad scanning. The hardware multiplier accelerates PID fixed-point math at 20 MHz.
推荐
Building Automation and HVAC Control
In HVAC controllers and building automation end points, the ATMEGA3208-AFR provides the right mix of analog sensing and communication. Its 10-bit ADC reads NTC thermistors, humidity sensor outputs and pressure transducers across up to 10 channels, while the 10-bit DAC can generate control references for valve or damper actuator drives. USARTs connect to RS-485 transceivers for Modbus RTU networks common in building systems, and the TWI interface manages RTC and EEPROM peripherals. The -40C to +105C rating covers rooftop units and mechanical rooms that exceed commercial ambient limits. Running at 20 MHz with a hardware multiplier, the core executes Modbus CRC and fixed-point control loops with large margin. Sleep modes with low quiescent consumption suit battery-backed thermostats and wireless sensor endpoints.
推荐
Consumer Appliances
White goods, coffee machines, dishwashers and small appliances benefit from the ATMEGA3208-AFR's combination of 5 V operation, robust I/O, and low cost. The 32 KB Flash holds UI logic, button debouncing, and closed-loop control for heaters, fans and pumps; 4 KB SRAM accommodates state machines and display buffers for segment LCD drivers driven over SPI. The configurable custom logic peripheral can implement zero-cross detection for triac firing directly in hardware, improving AC power control accuracy while offloading the CPU. The -40C to +105C range survives near heat-generating components such as motors and heating elements. FuSa-supporting classification aids appliance safety assessments. The single-wire UPDI interface allows one-pin in-factory programming, keeping test-pad count and fixture cost minimal on high-volume production lines.
推荐
Sensor Nodes and IoT End Points
For wired and battery-powered sensor nodes, the ATMEGA3208-AFR combines low-power sleep modes with enough compute for local signal processing and protocol handling. The 10-bit ADC with internal reference samples analog sensors such as photoresistors, strain gauges and gas-sensor bridges; the DAC and analog comparators support threshold alarms independent of firmware. TWI and SPI buses connect environmental sensors and sub-GHz or BLE radio modules over USART, while 32 KB Flash stores complete protocol stacks with OTA-style update hooks in a unified bootloader section. The hardware multiplier accelerates filtering math at 20 MHz. MVIO on the VDDIO2 bank interfaces 1.8 V radios from a 3.3 V system supply without level shifters, reducing BOM cost and board area in compact sensor-module designs.
推荐
Small Motor Control
The ATMEGA3208-AFR suits scalar (V/f) and single-phase motor control where the hardware multiplier computes fixed-point control equations efficiently at 20 MHz. Its 10-bit ADC samples bus voltage, current-shunt feedback and temperature in rotation or single-shot conversions; analog comparators with the CCL can implement cycle-by-cycle current limiting in hardware, protecting power stages without firmware latency. Timers generate complementary or single-edge PWM outputs for MOSFET gate drivers, and the event system routes ADC-done events directly to timer updates for deterministic loop timing. The -40C to +105C temperature rating suits motor-drive environments near heat sources. Typical targets include fans, pumps, blowers and small compressors using bridge or half-bridge power stages rated below 100 W.
推荐
Test, Measurement and Instrumentation Front Ends
In low-cost bench instruments, dongles and dataloggers, the ATMEGA3208-AFR acts as the system controller handling user interface, calibration storage and measurement sequencing. The 10-bit ADC with internal references measures analog front-end outputs, while the 10-bit DAC provides programmable offsets or reference levels for comparator-based threshold tests. 256 bytes of EEPROM store factory calibration constants that survive firmware updates, and 32 KB Flash leaves room for a unified bootloader enabling field upgrades over USART. Precision analog sections can delegate critical measurement to dedicated ADCs over SPI, with the MCU managing averaging, filtering (using the hardware multiplier for FIR/IIR math) and USB or RS-232 reporting. The FuSa-supporting classification supports instruments destined for safety-relevant lab environments.
推荐
推荐产品汇总
工程参考数据： ATMEGA3208-AFR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ATMEGA4808-AFR | ATMEGA1608-AFR | ATMEGA3208-AUR | ATMEGA3208-AF | ATMEGA4808-AUR |
|---|---|---|---|---|---|---|
| Package | 32-TQFP (7x7 mm) | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 48 KB | 16 KB | 32 KB | 32 KB | 48 KB |
| SRAM | 4 KB | 6 KB | 2 KB | 4 KB | 4 KB | 6 KB |
| Max Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Temperature | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +85C | -40C to +105C | -40C to +85C |
| EEPROM | 256 bytes | 256 bytes | 128 bytes | 256 bytes | 256 bytes | 256 bytes |
| Packaging | Tape & Reel | Tape & Reel | Tape & Reel | Tape & Reel | Tray | Tape & Reel |
关键差异点
- Extended -40C to +105C industrial temperature rating （对比 ATMEGA3208-AUR)
- Memory headroom upgrade path without respin （对比 ATMEGA4808-AFR)
- Functional Safety (FuSa) supporting classification （对比 ATMEGA3208-AF)
- MVIO multi-voltage I/O bank （对比 Older ATmega328P (TQFP-32, not drop-in))
设计说明
Decouple each VDD and VDDIO2 pin with 100 nF ceramic capacitors placed within 2 mm of the pin, plus one 4.7 uF to 10 uF bulk capacitor per supply domain. The 32-TQFP has no exposed pad, so thermal relief relies on via-connected ground flood on layer 2. Route the UPDI line (PA0) to a single test pad or 3-pin header (VDD, UPDI, GND) to enable in-circuit reprogramming without sacrificing an external connector. Keep the 32.768 kHz crystal (if used for RTC/PIT timing) close to the PA pins with a guarded ground ring per Microchip's megaAVR 0-series hardware design application guidance.
The device runs from a single 1.8 V to 5.5 V rail, but the datasheet speed-versus-voltage derating curves constrain maximum clock frequency at low supply - verify 20 MHz operation is valid at your chosen VDD margin, including supply tolerance and transients. If using MVIO, VDDIO2 must be powered before or simultaneously with Port C communication and may be at a different voltage (e.g., 1.8 V) than VDD (5 V); never leave VDDIO2 floating when Port C pins are used. Estimated: at 5 V and 20 MHz, typical active current of a megaAVR 0-class device is in the several-mA range - confirm exact figure in the datasheet electrical characteristics table for your thermal budget.
Reserve Flash for the bootloader at link time: once a unified bootloader region is set (via fuse/lockbits semantics on the 0-series), application space shrinks permanently until a full-chip erase. PA0 doubles as UPDI - do not connect external pull-ups or heavy loads that could interfere with programming; a simple series resistor preserves both functions. Fuse settings (e.g., disabling UPDI in favor of reset) can brick single-wire access and require a 12 V recovery pulse on supported programmers. Finally, remember the R suffix means reel packaging: bake per MSL guidance if floor life is exceeded before reflow.
合规信息
RoHS/lead-free status inferred from standard Microchip TQFP orderables; REACH, halogen-free and conflict-minerals statements not present in the provided web data - verify on the Microchip product page environmental section.