ATSAM3N4BA-AU - 48MHz Cortex-M3, 256KB Flash MCU | Microchip
MPN： ATSAM3N4BA-AU ✓ 啟用中ATSAM3N4BA-AU 概覽
A microcontroller unit (MCU) is a single-chip computer that integrates a processor core, non-volatile program memory, RAM, and peripheral functions such as timers, serial interfaces, and analog-to-digital converters. Within the embedded-systems hierarchy, the ATSAM3N4BA sits in the general-purpose 32-bit MCU class, one step above 8-bit controllers like the PIC16 family and one step below high-performance application processors, making it well suited for cost-sensitive control tasks that still require 32-bit arithmetic and C-friendly execution.
Key features include the ARM Cortex-M3 revision 2.0 core executing Thumb-2 instructions, a 24-bit SysTick timer, a nested vector interrupt controller (NVIC), and an internal oscillator that removes the need for an external crystal in many designs. The device operates from a single 1.62 V to 3.6 V supply (nominally 1.8 V or 3.3 V) and is characterized for industrial temperature ranges. The B-suffix SAM3N variant adds peripheral connectivity such as HSMCI for SD/MMC media storage alongside USART, SPI, TWI, and PWM channels.
Architecturally, the SAM3N series uses the Cortex-M3 three-stage pipeline with Harvard bus structure, delivering deterministic interrupt latency and efficient code density through Thumb-2. Per the SAM3N datasheet summary, the SAM3N4/2/1/0/00 series is pin-to-pin compatible with SAM3S products, which simplifies migration between memory and peripheral density points.
Typical applications include industrial sensors and control nodes, consumer appliances, metering front ends, and battery-powered portable equipment where 48 MHz performance, 256 KB flash, and low power matter more than USB or Ethernet connectivity.
When designing with this device, verify that your codebase fits within 256 KB flash and 24 KB SRAM, and consider the SAM3S series if USB device capability is needed, since footprints are shared.
This page synthesizes distributor availability data, drop-in alternatives within the SAM3N/SAM3S pin-compatible family, and practical design guidance not found in the manufacturer datasheet.
直接替換替代品，適用於 ATSAM3N4BA-AU — 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： ATSAM3N4BA-AU （相同外形與佔位） — 差異在於 Core Processor, Package, Pin Compatibility, Program Memory Size, RAM Size.
ATSAM3S4BA-AU
✅ 直接替換聯絡詢價
查看資料表 →ATSAM3N4AA-AU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATSAM3N2BA-AU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATSAM3N1BA-AU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATSAM3S4AA-AU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATSAM3N4BA-AU 最大額定值與電氣特性
| Core Processor | ARM Cortex-M3 (revision 2.0) |
| Core Size | 32-bit |
| Maximum Clock Speed | 48 MHz |
| Flash Memory | 256 KB (256K x 8) |
| SRAM | 24 KB (24K x 8) |
| Number of I/O | 47 |
| 供應電壓 | 1.8 V / 3.3 V (1.62 V to 3.6 V) |
| Oscillator Type | Internal |
| Instruction Set | Thumb-2 |
| SysTick Timer | 24-bit |
| Interrupt Controller | NVIC (Nested Vectored Interrupt Controller) |
| 封裝 / 外殼 | 64-LQFP (10 x 10 mm) |
| 安裝類型 | Surface Mount |
| Packaging | Tray |
| Pin-to-Pin Compatibility | SAM3S series |
ATSAM3N4BA-AU 64-lqfp (10 x 10 mm) 腳位配置指南
ATSAM3N4BA-AU（64-lqfp (10 x 10 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： ATSAM3N4BA-AU.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATSAM3N4BA-AU 適用於 6 應用s: Industrial Sensor Nodes, Data Logging with SD/MMC Storage, Metering and Building Automation, Portable and Battery-Powered Devices, Appliance and Consumer Control Boards, Motor Control and Actuation Interfaces.
Industrial Sensor Nodes
The ATSAM3N4BA-AU fits industrial sensor acquisition nodes because its 48 MHz Cortex-M3 core handles filtering and protocol conversion while 256 KB of Flash retains room for OTA-style field updates and 24 KB SRAM buffers multi-channel samples. Its internal oscillator simplifies BOM in sealed sensor housings, and 1.8 V/3.3 V operation eases integration with low-power analog front ends. Wired links such as USART, SPI, and TWI connect to fieldbus bridges or gateways, and the 47 GPIO lines drive local relays and status indicators in the same footprint.
推薦
Data Logging with SD/MMC Storage
Because the B-suffix SAM3N4BA integrates an HSMCI controller, the device is a natural fit for dataloggers that write sensor streams to SD or MMC cards. The 48 MHz CPU sustains FAT filesystem updates while SPI-connected ADCs stream data over DMA-style buffered transfers, and the 256 KB Flash stores logging firmware plus data tables. Power budgets benefit from 3.3 V single-supply operation with internal clocking, and the pin-compatible family lets engineers move between memory densities as log capacity requirements evolve without PCB respins.
推薦
Metering and Building Automation
Utility meters, HVAC controllers, and lighting-control panels benefit from the ATSAM3N4BA-AU's combination of 47 GPIO, multiple UART/TWI channels for communicating with metering ICs, and enough Flash headroom for communication stacks and calibration tables. The Cortex-M3's deterministic NVIC interrupt latency supports precise energy-pulse counting, while industrial temperature characterization suits unconditioned meter cabinets. The internal oscillator removes crystal-related field failures, and Thumb-2 code density keeps modest 256 KB Flash sufficient for full application, bootloader, and future feature additions.
推薦
Portable and Battery-Powered Devices
Handheld instruments and portable peripherals use the ATSAM3N4BA-AU for its 1.62 V to 3.6 V single-supply operation and internal oscillator, which reduce component count on compact PCBs. The 48 MHz Cortex-M3 provides headroom for GUI refresh and signal processing while remaining frugal in sleep modes for battery operation. SPI and TWI interfaces connect displays, touch controllers, and battery monitors, and the 64-LQFP 10 x 10 mm footprint balances hand-assembly feasibility with routing density typical of portable product layouts.
推薦
Appliance and Consumer Control Boards
Washing machines, small cooktops, and ventilation controls require moderate compute with robust GPIO and PWM capability - exactly the profile of the ATSAM3N4BA-AU. Its 47 I/O lines directly drive seven-segment displays, keypads, triac firing circuits, and encoder inputs, while Cortex-M3 performance at 48 MHz covers closed-loop control timing. The pin-to-pin compatibility with the SAM3S series (per the Atmel datasheet) gives appliance OEMs a USB-enabled migration path for connected product variants without changing the control-board layout or certification base.
推薦
Motor Control and Actuation Interfaces
Small actuation systems - damper drives, pump controllers, and stepper-based mechanisms - use the ATSAM3N4BA-AU's PWM channels and precise Cortex-M3 interrupt timing to generate commutation and duty-cycle control signals. The 24-bit SysTick timer provides a stable timebase for control loops, and 47 GPIO support limit-switch sensing and H-bridge direction control. Running from a 3.3 V rail shared with gate-driver logic simplifies power-tree design, while the industrial temperature rating and internal oscillator improve reliability in electrically noisy motor enclosures.
推薦
推薦產品摘要
工程參考資料，適用於 ATSAM3N4BA-AU — 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 | ATSAM3S4BA-AU | ATSAM3N4AA-AU | ATSAM3N2BA-AU | ATSAM3N1BA-AU | ATSAM3S4AA-AU |
|---|---|---|---|---|---|---|
| Package | 64-LQFP (10 x 10 mm) | 64-LQFP (10 x 10 mm) - same | 64-LQFP (10 x 10 mm) - same | 64-LQFP (10 x 10 mm) - same | 64-LQFP (10 x 10 mm) - same | 64-LQFP (10 x 10 mm) - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) |
| Core / Clock | Cortex-M3, 48 MHz | Cortex-M3, 48 MHz | Cortex-M3, 48 MHz | Cortex-M3, 48 MHz | Cortex-M3, 48 MHz | Cortex-M3, 48 MHz |
| Flash | 256 KB | 256 KB | 256 KB | 128 KB | 64 KB | 256 KB |
| SRAM | 24 KB | 24 KB | 24 KB | 16 KB | 12 KB | 24 KB |
| USB Device Port | No | Yes | No | No | No | Yes |
| HSMCI (SD/MMC) | Yes (B-suffix) | Yes | No | Yes (B-suffix) | Yes (B-suffix) | No |
主要差異化特點
- Largest SAM3N memory density with SD/MMC interface (對比ATSAM3N2BA-AU)
- Documented SAM3S pin compatibility enables zero-respin USB upgrade (對比ATSAM3S4BA-AU)
- Honest trade-off: no USB or Ethernet connectivity (對比ATSAM3S4BA-AU)
設計說明
Verify memory fit before layout freeze: the ATSAM3N4BA-AU provides 256 KB Flash and 24 KB SRAM, which is generous for control code but tight for large buffers or RTOS-heavy stacks. If your code image exceeds 256 KB or your SRAM budget grows, plan migration to a pin-compatible SAM3S part with larger flash (e.g., SAM3S8/SAM3S16) rather than a mid-project respin - the datasheet guarantees pin-to-pin compatibility across the SAM3N/SAM3S families.
The device operates from a single 1.62 V to 3.6 V supply with a nominal 3.3 V rail. Decouple each VDD/VDDIO pin pair with 100 nF ceramic capacitors placed within a few millimeters of the pins, plus one bulk 10 uF capacitor per power domain. Because the internal oscillator is enabled by default, a power-gated or battery design can start up without crystal settling delay - but enable the crystal path and appropriate startup time in firmware if your application needs UART-class timing accuracy.
The 64-LQFP 10 x 10 mm footprint supports straightforward two-layer routing for GPIO-rich designs: keep the 0.5 mm pitch leads fan out on the top layer, and reserve ground pours for analog rails feeding any on-chip peripherals. If a future upgrade to the USB-capable ATSAM3S4BA-AU is plausible, route the shared USB/DDM pins to a test point or small connector footprint now - this preserves the migration path documented in the SAM3N datasheet pin-compatibility statement without a PCB respin later.
合規資訊
Compliance status was not stated in the verified web data; Microchip SAM3N standard industrial parts are typically RoHS-compliant, but confirm on the Microchip product page before procurement.
