ATSAM3N00AA-MU - 48MHz Cortex-M3 MCU 16KB Flash | Microchip
MPN： ATSAM3N00AA-MU ✓ 啟用中ATSAM3N00AA-MU 概覽
A microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and peripherals into one chip, forming the heart of embedded systems. The ATSAM3N00AA belongs to the entry-level tier of the SAM3N family, which sits within the broader ARM Cortex-M 32-bit microcontroller hierarchy, above 8-bit MCUs in throughput while remaining cost-optimized for high-volume designs.
Key features include the high-performance ARM Cortex-M3 RISC processor with Harvard architecture and 3-stage pipeline, 16 KB (16K x 8) of single-cycle flash program memory, and 4 KB of SRAM. The device integrates a rich peripheral set for its class, including USART and UART serial ports, SPI, TWI (I2C), multiple timers, and an ADC, enabling compact single-chip designs for serial bridging, sensing, and control tasks.
The SAM3N series is documented by Atmel (now Microchip) as pin-to-pin compatible with the SAM3S series, and family members scale in memory while sharing the same footprint. This allows a single PCB design to be populated with different SAM3N/SAM3S flash densities as memory requirements evolve - a significant advantage in cost-sensitive, high-volume applications where firmware growth must not force a board respin.
Typical applications include industrial sensor nodes, consumer appliance control, motor-adjacent auxiliary control, low-cost data loggers, and general-purpose embedded control where a 48 MHz 32-bit core outclasses 8-bit alternatives at a similar price point. The industrial temperature grade supports harsh environments from -40C to +85C.
Design consideration: with only 16 KB flash and 4 KB SRAM, budget code size carefully; use compiler size optimization and consider ATSAM3N1AA-MU or higher as a pin-compatible upgrade path.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a decision-ready view of the SAM3N00A ecosystem.
直接替換替代品，適用於 ATSAM3N00AA-MU — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ATSAM3N00AA-MU （相同外形與佔位） — 差異在於 Pin Compatibility, SRAM, Core Processor, Package, Core Size.
ATSAM3N1AA-MU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATSAM3N2AA-MU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATSAM3N4AA-MU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATSAM3N0AA-MU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATSAM3S2AA-MU
✅ 直接替換聯絡詢價
查看資料表 →ATSAM3N00AA-MU 最大額定值與電氣特性
| Core Processor | ARM Cortex-M3 |
| Core Size | 32-Bit |
| Maximum Clock Speed | 48 MHz |
| Flash Memory | 16 KB (16K x 8) |
| SRAM | 4 KB |
| 封裝 | 48-QFN (7x7 mm) |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40C to +85C (Industrial) |
| Communication Interfaces | USART, UART, SPI, TWI (I2C) |
| Programmability | In-System Programmable Flash |
| RoHS 狀態 | Compliant (Green package) |
| Family Series | SAM3N (SAM3N00A) |
ATSAM3N00AA-MU 48-qfn (7x7 mm) 腳位配置指南
ATSAM3N00AA-MU（48-qfn (7x7 mm) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： ATSAM3N00AA-MU.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATSAM3N00AA-MU 適用於 6 應用s: Industrial Sensor Nodes, Consumer Appliance Control, Low-Cost Data Loggers, Motor-Adjacent Auxiliary Control, Serial Protocol Bridges, Building Automation Peripherals.
Industrial Sensor Nodes
The ATSAM3N00AA-MU fits industrial sensor nodes where a 48 MHz Cortex-M3 core handles signal acquisition, filtering, and serial reporting that would overload 8-bit MCUs. Its SPI and TWI interfaces connect directly to ADCs, MEMS sensors, and EEPROMs, while the USART links to RS-485 transceivers or modems. With 16 KB flash, bare-metal firmware for sampling and packet framing fits comfortably. The -40C to +85C industrial grade and low-power modes suit always-on, battery-assisted deployments in factory monitoring, where the 32-bit core also provides headroom for lightweight protocol stacks and local decision logic without a design migration.
推薦
Consumer Appliance Control
The ATSAM3N00AA-MU suits appliance control boards - washing machines, small HVAC units, coffee makers - where cost pressure is high but a 32-bit core simplifies motor timing loops and user-interface handling. The 48 MHz Cortex-M3 executes PID control and button/debounce logic with large timing margins, and the RoHS-compliant green QFN package meets consumer environmental requirements. At roughly $1.29 per unit as of 2026-09-19, it competes directly with mid-range 8-bit parts while offering family upgradeability: if firmware grows past 16 KB flash, the pin-compatible ATSAM3N1AA-MU drops onto the same PCB without respin, protecting the tooling investment.
推薦
Low-Cost Data Loggers
For data loggers recording sensor values to flash or SD cards, the ATSAM3N00AA-MU provides the required serial interfaces and low-power modes in a small 7x7 mm QFN. The SPI port drives SD cards and flash memory, the 12-bit ADC class peripheral samples analog channels, and the USART streams data to telemetry radios. Sleep and wait modes extend battery life between sample intervals, and the 4 KB SRAM buffers records during write bursts. Designs that later need larger buffers or file systems migrate to ATSAM3N2AA-MU (128 KB flash, 24 KB SRAM) on the identical 48-QFN footprint, preserving board layout and test fixtures.
推薦
Motor-Adjacent Auxiliary Control
The ATSAM3N00AA-MU serves as auxiliary control for motor-driven equipment - fans, pumps, and small actuators - handling tachometer capture, PWM gating to external drivers, and safety supervision. Its timers generate PWM outputs while the ADC monitors current-sense voltages for stall or overload detection, and the Cortex-M3 core executes supervision logic deterministically. Because it does not integrate a high-current motor driver itself, pair it with a gate driver or driver IC on the power stage. Industrial temperature rating supports enclosed motor housings, and the low unit cost allows per-channel deployment of dedicated supervisory MCUs across multi-motor systems.
推薦
Serial Protocol Bridges
With USART, SPI, and TWI on a 48 MHz core, the ATSAM3N00AA-MU is a natural protocol bridge - translating between RS-232/RS-485 field devices and SPI peripherals, or buffering USB-adjacent serial links. The 16 KB flash accommodates bidirectional FIFO handling and simple framing protocols, while 4 KB SRAM provides packet buffering. Industrial-grade qualification supports cabinet-mounted converters in factory settings. Where USB is required on-board, the pin-to-pin compatible SAM3S family (e.g., ATSAM3S2AA-MU) offers a USB device peripheral on the same footprint, letting one PCB design serve both USB and non-USB product variants with minimal engineering duplication.
推薦
Building Automation Peripherals
In building automation - thermostats, damper controllers, occupancy sensor interfaces - the ATSAM3N00AA-MU delivers the processing for control loops and TWI-based sensor aggregation at a price point that scales across thousands of nodes. Its 32-bit core handles time-keeping logic, TWI polling of temperature and humidity sensors, and USART communication with RS-485 building buses. Low standby consumption suits battery-backed nodes, and the industrial temperature range covers unconditioned mechanical rooms. The pin-compatible family ladder (ATSAM3N00AA through ATSAM3N4AA) lets manufacturers offer feature-tiered SKUs from a single PCB, reducing inventory complexity and qualification effort across the product line.
推薦
推薦產品摘要
工程參考資料，適用於 ATSAM3N00AA-MU — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ATSAM3N1AA-MU | ATSAM3N2AA-MU | ATSAM3N4AA-MU | ATSAM3S2AA-MU |
|---|---|---|---|---|---|
| Package | 48-QFN (7x7 mm) | 48-QFN (7x7 mm) - same | 48-QFN (7x7 mm) - same | 48-QFN (7x7 mm) - same | 48-QFN (7x7 mm) - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Clock | ARM Cortex-M3, 48 MHz | ARM Cortex-M3, 48 MHz | ARM Cortex-M3, 48 MHz | ARM Cortex-M3, 48 MHz | ARM Cortex-M3, 48 MHz |
| Flash Memory | 16 KB | 32 KB | 128 KB | 256 KB | 64 KB |
| SRAM | 4 KB | 6 KB | 24 KB | 48 KB | 16 KB |
| USB Peripheral | No | No | No | No | Yes (USB device) |
主要差異化特點
- Lowest cost entry to pin-compatible SAM3N ladder (對比ATSAM3N4AA-MU)
- Cortex-M3 performance at 8-bit price point (對比ATSAM3S2AA-MU)
- Trade-off: minimal memory density (對比ATSAM3N2AA-MU)
設計說明
The 16 KB flash / 4 KB SRAM budget is the single most common design risk with the ATSAM3N00AA-MU. Compile with size optimization (-Os), avoid heavyweight libraries, and reserve headroom for a bootloader and firmware-field-update mechanism. If linked size approaches 14 KB, plan the migration path to ATSAM3N1AA-MU or higher - Microchip documents the SAM3N family as pin-to-pin compatible, so this is a solder-down swap, not a respin.
The 48-QFN 7x7 mm package has a center exposed ground pad that must be soldered to a grounded copper pour with multiple thermal vias for reliable grounding and heat dissipation. Place 100 nF ceramic decoupling capacitors at each supply pin pair within 2 mm of the package, plus a bulk 4.7 uF-10 uF capacitor near the supply entry. Verify stencil aperture design for the exposed pad to prevent voiding during reflow.
The SAM3N family operates from a 3.3V-class supply rail; confirm the exact VDDCore/VDDIO range and sequencing requirements in the current SAM3N datasheet before finalizing the power tree. For battery or noisy industrial supplies, add an LDO with low quiescent current (e.g., MCP1700 class) and use the MCU wait/sleep modes with the RTC or a general-purpose timer as wakeup source to minimize average current in duty-cycled logger or sensor-node applications.
Route SWD (SWCLK/SWDIO) programming pins to a standard 2x5 Cortex debug header or tagged test points - the QFN package offers no post-assembly access to traces underneath, and in-system programming via the flash bootloader requires access to the debug or serial port. Keep USART boot pins (per SAM3N ROM bootloader mapping) pulled to defined states at reset so the device boots into application flash rather than the ROM monitor.
合規資訊
Mouser lists the package as QFN, GREEN, IND TEMP, MRL A - the GREEN designation indicates RoHS-compliant, halogen-free packaging. AEC-Q100 qualification is not claimed for the SAM3N series.
