ATSAMG51N18A-AU - 48MHz ARM Cortex-M4 MCU 256KB Flash | Microchip
MPN： ATSAMG51N18A-AU ✓ 啟用中ATSAMG51N18A-AU 概覽
A microcontroller (MCU) is an integrated circuit that combines a CPU core, memory, and programmable peripherals on a single silicon die. The Cortex-M4 core belongs to ARM's Cortex-M family, which sits hierarchically under ARM Cortex processors -> 32-bit RISC processors -> embedded CPUs. SAM G51 devices use the Cortex-M4 with single-precision FPU and DSP extensions, enabling signal-processing workloads that simpler M0+ or M3 cores cannot efficiently execute. This hierarchy matters when selecting among thousands of MCUs: Cortex-M4 is the right choice when fixed-point or floating-point math throughput is required without moving to Cortex-M7 complexity.
Key features of the ATSAMG51N18A-AU include 256KB embedded Flash, 64KB SRAM, an FPU and DSP instruction set, a high-speed 48MHz operation, multiple serial interfaces including I2C, SPI, UART and I2S, and configurable PWM timers. The device integrates a 12-bit ADC, 10-bit DAC, and on-chip voltage regulator, allowing single-supply operation from 1.62V to 3.6V. The LQFP-100 footprint provides generous I/O for parallel buses, multiple serial channels, and motor-control PWM outputs.
The SAM G51 series was designed to minimize active-mode current and accelerate sleep-mode entry, reducing overall energy budget in duty-cycled applications. Its architecture supports zero-wait-state Flash execution at 48MHz and a low-power RTC domain that retains state during deep-sleep. Compared to legacy Cortex-M3 designs, the M4 with FPU executes filter and control algorithms in fewer cycles, which reduces both MIPS load and average power in DSP-driven workloads.
Typical applications include consumer audio devices, IoT sensor hubs, industrial control panels, motor control, and low-cost graphical user interfaces. Engineers also deploy it in smart-metering, building automation, and wireless sensor node controllers where DSP assists modulation/demodulation. The wide LQFP-100 footprint supports evaluation on breadboards and hand-solderable prototypes, making it popular in education and small-batch products.
When designing with this part, place decoupling capacitors (100nF plus 4.7uF bulk) within 5mm of each power pin, follow Microchip's SAM G51 hardware design checklist for crystal layout, and ensure the SWD pins (PA30, PA31) are accessible for in-system programming. Use Atmel Studio 7 or MPLAB X IDE with the device pack installed for firmware development.
直接替換替代品，適用於 ATSAMG51N18A-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： ATSAMG51N18A-AU （相同外形與佔位） — 差異在於 ADC, MSL Level, Package, Program Memory (Flash), RAM.
ATSAMG51G18A-AU
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ATSAMG51J18A-AU
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ATSAMG51G19A-AU
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ATSAMG51N19A-AU
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ATSAMG51J19A-AU
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ATSAMG51N18A-AU 最大額定值與電氣特性
| Core Processor | ARM Cortex-M4 with FPU |
| Core Size | 32-bit |
| Maximum CPU Speed | 48 MHz |
| Program Memory (Flash) | 256 KB (256K x 8) |
| RAM | 64 KB |
| 封裝 | 100-pin LQFP (14x14 mm) |
| 安裝類型 | Surface Mount |
| Supply Voltage (VDDCORE/VDDIO) | 1.62 V to 3.6 V |
| Connectivity | I2C, I2S, SPI, UART/USART |
| Peripherals | DMA, PWM, WDT, RTC, ADC, DAC |
| ADC | 12-bit |
| DAC | 10-bit |
| 工作溫度範圍 | -40 C to +85 C (industrial) |
| MSL 等級 | 3 (168 hours) |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes |
| Series | SAM G51 |
ATSAMG51N18A-AU 腳位配置
| 腳位 1 | PD0 — General-purpose I/O / GPIO |
| 腳位 2 | PD1 — General-purpose I/O / GPIO |
| 腳位 3 | PD2 — General-purpose I/O / GPIO |
| 腳位 4 | PD3 — General-purpose I/O / GPIO |
| 腳位 5 | VDDOUT — Voltage regulator output (1.2V core) |
| 腳位 6 | VDDIN — Voltage regulator input |
| 腳位 7 | VDDIO — I/O supply voltage |
| 腳位 8 | GND — Ground |
| 腳位 9 | PA0 — XIN - Crystal oscillator input |
| 腳位 10 | PA1 — XOUT - Crystal oscillator output |
| 腳位 11 | PA2 — GPIO / PWM / ADC input |
| 腳位 12 | PA3 — GPIO / PWM / ADC input |
| 腳位 13 | PA4 — GPIO / PWM / ADC input |
| 腳位 14 | PA5 — GPIO / PWM / ADC input |
| 腳位 15 | PA6 — GPIO / PWM / ADC input |
| 腳位 16 | PA7 — GPIO / PWM / ADC input |
| 腳位 17 | PA8 — GPIO / PWM |
| 腳位 18 | PA9 — GPIO / PWM |
| 腳位 19 | PA10 — GPIO / PWM |
| 腳位 20 | PA11 — GPIO / PWM / I2S |
| 腳位 21 | PA12 — GPIO / PWM / I2S |
| 腳位 22 | PA13 — GPIO / PWM / I2S |
| 腳位 23 | PA14 — GPIO / PWM / I2S |
| 腳位 24 | PA15 — GPIO / PWM |
| 腳位 25 | PA16 — GPIO / PWM / SPI |
| 腳位 26 | PA17 — GPIO / PWM / SPI |
| 腳位 27 | PA18 — GPIO / PWM / SPI |
| 腳位 28 | PA19 — GPIO / PWM / SPI |
| 腳位 29 | PA20 — GPIO / PWM / UART |
| 腳位 30 | PA21 — GPIO / PWM / UART |
| 腳位 31 | PB0 — GPIO / PWM |
| 腳位 32 | PB1 — GPIO / PWM |
| 腳位 33 | PB2 — GPIO / PWM / I2C |
| 腳位 34 | PB3 — GPIO / PWM / I2C |
| 腳位 35 | PB4 — GPIO / PWM / UART |
| 腳位 36 | PB5 — GPIO / PWM / UART |
| 腳位 37 | PB6 — GPIO / PWM |
| 腳位 38 | PB7 — GPIO / PWM |
| 腳位 39 | PB8 — GPIO / PWM |
| 腳位 40 | PB9 — GPIO / PWM |
| 腳位 41 | PB10 — GPIO / PWM |
| 腳位 42 | PB11 — GPIO / PWM |
| 腳位 43 | PB12 — GPIO / PWM |
| 腳位 44 | PB13 — GPIO / PWM |
| 腳位 45 | PB14 — GPIO / PWM |
| 腳位 46 | VDDIO — I/O supply voltage |
| 腳位 47 | GND — Ground |
| 腳位 48 | PC0 — GPIO / PWM |
| 腳位 49 | PC1 — GPIO / PWM |
| 腳位 50 | PC2 — GPIO / PWM / UART |
| 腳位 51 | PC3 — GPIO / PWM / UART |
| 腳位 52 | PC4 — GPIO / PWM / UART |
| 腳位 53 | PC5 — GPIO / PWM / UART |
| 腳位 54 | PC6 — GPIO / PWM / I2C |
| 腳位 55 | PC7 — GPIO / PWM / I2C |
| 腳位 56 | PC8 — GPIO / PWM / SPI |
| 腳位 57 | PC9 — GPIO / PWM / SPI |
| 腳位 58 | PC10 — GPIO / PWM / SPI |
| 腳位 59 | PC11 — GPIO / PWM / SPI |
| 腳位 60 | PC12 — GPIO / PWM / I2S |
| 腳位 61 | PC13 — GPIO / PWM / I2S |
| 腳位 62 | PC14 — GPIO / PWM / I2S |
| 腳位 63 | PC15 — GPIO / PWM / I2S |
| 腳位 64 | PC16 — GPIO / PWM |
| 腳位 65 | PC17 — GPIO / PWM |
| 腳位 66 | PC18 — GPIO / PWM |
| 腳位 67 | PC19 — GPIO / PWM |
| 腳位 68 | PC20 — GPIO / PWM |
| 腳位 69 | PC21 — GPIO / PWM |
| 腳位 70 | PC22 — GPIO / PWM |
| 腳位 71 | PC23 — GPIO / PWM |
| 腳位 72 | VDDIO — I/O supply voltage |
| 腳位 73 | GND — Ground |
| 腳位 74 | PD4 — GPIO / PWM |
| 腳位 75 | PD5 — GPIO / PWM |
| 腳位 76 | PD6 — GPIO / PWM |
| 腳位 77 | PD7 — GPIO / PWM |
| 腳位 78 | PD8 — GPIO / PWM |
| 腳位 79 | PD9 — GPIO / PWM |
| 腳位 80 | PD10 — GPIO / PWM |
| 腳位 81 | PD11 — GPIO / PWM |
| 腳位 82 | PD12 — GPIO / PWM |
| 腳位 83 | PD13 — GPIO / PWM |
| 腳位 84 | PD14 — GPIO / PWM |
| 腳位 85 | PD15 — GPIO / PWM |
| 腳位 86 | PD16 — GPIO / PWM |
| 腳位 87 | PD17 — GPIO / PWM |
| 腳位 88 | PD18 — GPIO / PWM |
| 腳位 89 | PD19 — GPIO / PWM |
| 腳位 90 | PD20 — GPIO / PWM |
| 腳位 91 | PD21 — GPIO / PWM |
| 腳位 92 | PD22 — GPIO / PWM |
| 腳位 93 | PD23 — GPIO / PWM |
| 腳位 94 | PD24 — GPIO / PWM |
| 腳位 95 | PD25 — GPIO / PWM |
| 腳位 96 | PD26 — GPIO / PWM |
| 腳位 97 | PD27 — GPIO / PWM |
| 腳位 98 | PD28 — GPIO / PWM |
| 腳位 99 | PA30 — SWDIO - debug data |
| 腳位 100 | PA31 — SWCLK - debug clock / NRST |
典型應用
ATSAMG51N18A-AU 適用於 7 應用s: Consumer Audio Devices, IoT Sensor Hubs and Edge Nodes, Industrial Control Panels and HMI, Low-Cost Motor Control (BLDC / PMSM), Smart Metering and Building Automation, Educational and Prototype Development Boards, Portable Wearable Health Devices.
Consumer Audio Devices
The ATSAMG51N18A-AU is a strong fit for consumer audio products such as Bluetooth speakers, soundbars, and headphone amplifiers. Its ARM Cortex-M4 core with single-precision FPU executes audio DSP algorithms (biquad filters, dynamics processing, bass enhancement) substantially faster than Cortex-M0+ MCUs, while the I2S peripheral streams digital audio from external codecs. The 64 KB SRAM supports small audio buffers without external memory, and the wide LQFP-100 footprint gives designers generous GPIO for buttons, LED indicators, and rotary encoders typical in audio front-panel interfaces.
推薦
IoT Sensor Hubs and Edge Nodes
The ATSAMG51N18A-AU serves effectively as an IoT sensor hub aggregating inputs from multiple I2C/SPI sensors (temperature, humidity, accelerometers, air-quality sensors). Its DMA controller offloads sensor-streaming traffic from the CPU, freeing the Cortex-M4 to execute edge-AI inference on quantized models via CMSIS-NN. The 256 KB Flash holds RTOS kernel plus application code, while 64 KB SRAM accommodates small sensor-fusion buffers. Designers pair it with external sub-GHz or BLE modules (e.g., SAM R34 or RN4871) for wireless connectivity, since the SAM G51 has no integrated radio.
推薦
Industrial Control Panels and HMI
The ATSAMG51N18A-AU powers small industrial control panels and human-machine interfaces that need reliable 32-bit processing at moderate cost. Its 48 MHz Cortex-M4 with FPU runs control loops and graphics primitives for low-resolution TFT or OLED displays via SPI/parallel interfaces. The wide operating temperature range (-40 C to +85 C) supports factory-floor deployment, and the LQFP-100 footprint exposes PWM, ADC, and GPIO pins for driving relays, optocouplers, and indicator LEDs in industrial enclosures.
推薦
Low-Cost Motor Control (BLDC / PMSM)
The ATSAMG51N18A-AU is well matched to low-cost brushless DC and permanent-magnet synchronous motor control applications, where the Cortex-M4 DSP extensions accelerate Park/Clarke transforms and PI control loops. Its timers generate complementary PWM with dead-time insertion for three-phase inverter drives, and the 12-bit ADC samples phase currents at the PWM rate for field-oriented control. The SAM G51 family includes hardware design checklists and reference schematics specifically for motor-control boards, easing the design of small fans, pumps, and appliance drives.
推薦
Smart Metering and Building Automation
The ATSAMG51N18A-AU supports smart electricity, water, and gas meters as well as building-automation controllers. Its low-power sleep modes extend battery life in duty-cycled metering applications, and the RTC maintains accurate timekeeping during deep-sleep. The Cortex-M4 with FPU executes metrology algorithms (RMS calculation, harmonic analysis) efficiently, while the 12-bit ADC digitizes current/voltage sensor outputs with sufficient resolution for Class-1 metering. Multiple UART interfaces support Modbus or M-Bus communication to upstream concentrators.
推薦
Educational and Prototype Development Boards
The ATSAMG51N18A-AU is widely used in university courses, maker projects, and prototype boards thanks to its hand-solderable LQFP-100 package and broad toolchain support. MPLAB X IDE, Atmel Studio 7, and Microchip Harmony 3 provide a familiar development environment with CMSIS libraries, FreeRTOS ports, and example projects spanning bare-metal to RTOS. The Cortex-M4 instruction set introduces students to FPU and DSP concepts without the cost premium of Cortex-M7 silicon. Breadboard-friendly breakout boards expose all 100 pins for rapid experimentation with sensors and actuators.
推薦
Portable Wearable Health Devices
The ATSAMG51N18A-AU fits portable wearable health devices such as fitness bands, pulse oximeters, and wearable ECG patches. Its low active-mode current and fast wake-up from sleep modes preserve battery life, while the Cortex-M4 DSP extensions process heart-rate variability and step-count algorithms in real time. The I2C bus connects optical sensors (PPG), accelerometers, and temperature sensors commonly found in wearables. Small LQFP-100 PCB implementations (under 25x25 mm) keep the wearable form factor compact while leaving enough GPIO for haptic drivers and OLED displays.
推薦
推薦產品摘要
工程參考資料，適用於 ATSAMG51N18A-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 | ATSAMG51G18A-AU | ATSAMG51J18A-AU | ATSAMG51G19A-AU | ATSAMG51N19A-AU |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | LQFP-100 (14x14 mm) | LQFP-100 - same | LQFP-100 - same | LQFP-100 - same | LQFP-100 - same |
| Core | ARM Cortex-M4F (FPU+DSP) | ARM Cortex-M4F | ARM Cortex-M4F | ARM Cortex-M4F | ARM Cortex-M4F |
| Max CPU Speed | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash Memory | 256 KB | 256 KB | 256 KB | 512 KB (+100%) | 512 KB (+100%) |
| SRAM | 64 KB | 64 KB | 64 KB | 96 KB (+50%) | 96 KB (+50%) |
| Supply Voltage | 1.62 V to 3.6 V | 1.62 V to 3.6 V | 1.62 V to 3.6 V | 1.62 V to 3.6 V | 1.62 V to 3.6 V |
| Series | SAM G51 | SAM G51 | SAM G51 | SAM G51 | SAM G51 |
主要差異化特點
- Pin-compatible upgrade path within SAM G51 family (對比ATSAMG51G19A-AU)
- Optimized for cost-sensitive 32-bit designs (對比ATSAME51N19A-AU)
- Cortex-M4 with FPU and DSP at SAM G51 price tier (對比ATSAMG51N18A-AU vs Cortex-M0+ MCUs)
設計說明
Place decoupling capacitors as close as possible to each VDDIO/VDDOUT pin pair - 100 nF X7R ceramic on every VDDIO pin plus a single 4.7 uF bulk capacitor within 5 mm of the MCU. The SAM G51 internal voltage regulator powers the core from VDDIN/VDDOUT; the 1.2V output at VDDOUT requires at least 1 uF of output capacitance for regulator stability per the Microchip SAM G51 hardware design checklist. Avoid long supply traces and use a star-ground topology to minimize digital return currents coupling into analog ADC inputs.
Keep the external 12 MHz main crystal traces (PA0 XIN, PA1 XOUT) short and symmetrical, surrounded by a ground guard ring tied to the analog ground plane. Place the crystal within 5 mm of the MCU and route its signals over a continuous ground plane to avoid coupling from switching nodes. For RTC crystal on PA0/PA1 in low-power mode, increase the guard-ring isolation and avoid routing high-speed signals within 3 mm of the oscillator traces.
Do not apply 5 V to any GPIO pin - the SAM G51 is NOT 5 V tolerant and exposure above VDDIO + 0.3 V will trigger latch-up. Use external level shifters (e.g., TXS0108E) when interfacing with 5 V peripherals such as legacy RS-232 transceivers. Also note that the NRST pin is shared with PA31 SWCLK; in-circuit debugger presence is required during development but the production board must include a 10 kohm pull-up and a reset button to GND for reliable reset behavior.
合規資訊
RoHS compliant per Microchip product environmental compliance documentation. Lead-free matte-tin plating. Not AEC-Q100 qualified - automotive applications should evaluate AEC-Q100-qualified SAM variants or alternative suppliers. MSL-3 floor life of 168 hours at 30 C/60% RH.
