ATSAMD51J18A-AF - SAM D51 Cortex-M4F MCU 120MHz 256KB | Microchip
MPN： ATSAMD51J18A-AF ✓ 啟用中ATSAMD51J18A-AF 概覽
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash), volatile working memory (SRAM), and a rich set of peripherals such as timers, communication controllers, and analog blocks. The Cortex-M4F sits within the broader taxonomy of ARM Cortex-M cores (M0/M0+ -> M3 -> M4/M4F -> M7) and is positioned for DSP-class workloads while retaining deterministic interrupt behaviour and low-power Sleep modes. The SAM D51 family extends this core with Microchip's peripheral set, dual-panel Flash with ECC, and a dedicated Cortex-M4 core with FPU for floating-point acceleration.
Key features of the ATSAMD51J18A-AF include: up to 120 MHz core clock with single-precision FPU and DSP instructions, 256 KB dual-panel Flash with error correction, up to 128 KB SRAM, full-speed USB 2.0 device/host with on-the-go capability, a 12-bit 1 MSPS ADC with up to 16 channels, multiple SERCOM modules configurable as UART/SPI/I2C, I2S for digital audio, SDHC for memory cards, and an extended industrial operating temperature range. The 64-pin TQFP package balances I/O count with hand-solder-friendly pitch, simplifying prototype bring-up.
The architecture combines a Cortex-M4F core with a multi-layer bus matrix (AHB/APB) that allows simultaneous DMA-driven peripheral access and CPU execution. Hardware cryptographic acceleration (AES, True Random Number Generator), a high-precision internal 48 MHz DFLL, and an Event System for inter-peripheral signalling reduce CPU overhead and enable deterministic real-time response. Compared with Cortex-M0+ parts in the SAM D20/D21 family, the D51 delivers roughly 4x compute performance and substantially richer analog and connectivity resources.
Typical applications include industrial HMI panels, USB peripherals such as HID and CDC devices, audio playback stages using I2S codecs, smart sensor hubs, and low-power IoT edge nodes. The integrated FPU simplifies control-loop math and DSP-style filtering on a single MCU without an external DSP.
When designing with the ATSAMD51J18A-AF, ensure the 64-pin TQFP land pattern is allocated correctly and that decoupling follows Microchip's recommended 100 nF + bulk capacitor scheme near each supply pin. For USB applications the DP/DN lines require 90 ohm differential routing and an ESD array; for I2S audio, the MCLK-to-LRCLK ratio must match the codec's requirements and jitter on MCLK should be kept below the codec's specification.
直接替換替代品，適用於 ATSAMD51J18A-AF — 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： ATSAMD51J18A-AF （相同外形與佔位） — 差異在於 SRAM, MSL Level, Program Memory (Flash), Mounting Type, Package.
ATSAMD51J18A-AU
✅ 直接替換聯絡詢價
查看資料表 →ATSAMD51J19A-AF
✅ 直接替換📋 參考替代品（不在目錄中）
ATSAMD51J20A-AF
✅ 直接替換聯絡詢價
查看資料表 →ATSAMD51G18A-MF
✅ 直接替換聯絡詢價
查看資料表 →ATSAMD51J18A-AUT
✅ 直接替換聯絡詢價
查看資料表 →ATSAMD51P20A-CF
✅ 直接替換📋 參考替代品（不在目錄中）
ATSAMD51J18A-AF 最大額定值與電氣特性
| Core Architecture | ARM Cortex-M4F with single-precision FPU and DSP extensions |
| Maximum CPU Clock | 120 MHz |
| Program Memory (Flash) | 256 KB dual-panel with ECC |
| SRAM | Up to 128 KB |
| 封裝 | 64-pin TQFP (10x10 mm) |
| Supply Voltage (VDD) | 1.71 V to 3.63 V |
| 工作溫度 | -40C to +125C (extended industrial) |
| USB Interface | USB 2.0 Full-Speed Device/Host/OTG |
| ADC | 12-bit, up to 16 channels, 1 MSPS |
| Communication Peripherals (SERCOM) | Multiple SERCOM configurable as UART/SPI/I2C |
| Audio Interface | I2S |
| Storage Interface | SDHC / SDMMC |
| 安裝類型 | Surface Mount (TQFP) |
| RoHS 狀態 | Compliant |
| MSL 等級 | 3 (per JEDEC J-STD-020) |
ATSAMD51J18A-AF 腳位配置
| 腳位 1 | PA03 — General-purpose I/O / ADC input |
| 腳位 2 | PA04 — General-purpose I/O / ADC input |
| 腳位 3 | PA05 — General-purpose I/O |
| 腳位 4 | PA06 — General-purpose I/O |
| 腳位 5 | PA07 — General-purpose I/O |
| 腳位 6 | PA08 — General-purpose I/O / I2S |
| 腳位 7 | PA09 — General-purpose I/O / I2S |
| 腳位 8 | PA10 — General-purpose I/O |
| 腳位 9 | PA11 — General-purpose I/O / USB DM |
| 腳位 10 | VDDIO — I/O supply voltage |
| 腳位 11 | GND — Ground |
| 腳位 12 | PA12 — General-purpose I/O / USB DP |
| 腳位 13 | PA13 — General-purpose I/O |
| 腳位 14 | PA14 — General-purpose I/O |
| 腳位 15 | PA15 — General-purpose I/O |
| 腳位 16 | PA16 — General-purpose I/O / I2C SDA |
| 腳位 17 | PA17 — General-purpose I/O / I2C SCL |
| 腳位 18 | PA18 — General-purpose I/O |
| 腳位 19 | PA19 — General-purpose I/O |
| 腳位 20 | VDDCORE — Core supply (decoupling) |
| 腳位 21 | PA20 — General-purpose I/O |
| 腳位 22 | PA21 — General-purpose I/O |
| 腳位 23 | PA22 — General-purpose I/O |
| 腳位 24 | PA23 — General-purpose I/O |
| 腳位 25 | PA24 — General-purpose I/O |
| 腳位 26 | PA25 — General-purpose I/O |
| 腳位 27 | PA27 — General-purpose I/O |
| 腳位 28 | RESETN — Active-low reset input |
| 腳位 29 | VDDIO — I/O supply voltage |
| 腳位 30 | GND — Ground |
| 腳位 31 | PB00 — General-purpose I/O |
| 腳位 32 | PB01 — General-purpose I/O |
| 腳位 33 | PB02 — General-purpose I/O / ADC |
| 腳位 34 | PB03 — General-purpose I/O / ADC |
| 腳位 35 | PB04 — General-purpose I/O / ADC |
| 腳位 36 | PB05 — General-purpose I/O / ADC |
| 腳位 37 | PB06 — General-purpose I/O |
| 腳位 38 | PB07 — General-purpose I/O |
| 腳位 39 | PB08 — General-purpose I/O |
| 腳位 40 | PB09 — General-purpose I/O |
| 腳位 41 | PB10 — General-purpose I/O |
| 腳位 42 | PB11 — General-purpose I/O |
| 腳位 43 | PB12 — General-purpose I/O |
| 腳位 44 | PB13 — General-purpose I/O |
| 腳位 45 | PB14 — General-purpose I/O |
| 腳位 46 | PB15 — General-purpose I/O |
| 腳位 47 | PB16 — General-purpose I/O |
| 腳位 48 | PB17 — General-purpose I/O |
| 腳位 49 | PB18 — General-purpose I/O |
| 腳位 50 | PB19 — General-purpose I/O |
| 腳位 51 | PB20 — General-purpose I/O |
| 腳位 52 | PB21 — General-purpose I/O |
| 腳位 53 | PB22 — General-purpose I/O |
| 腳位 54 | PB23 — General-purpose I/O |
| 腳位 55 | PB24 — General-purpose I/O |
| 腳位 56 | PB25 — General-purpose I/O |
| 腳位 57 | VDDIO — I/O supply voltage |
| 腳位 58 | GND — Ground |
| 腳位 59 | PA00 — General-purpose I/O / XIN |
| 腳位 60 | PA01 — General-purpose I/O / XOUT |
| 腳位 61 | PA02 — General-purpose I/O / ADC |
| 腳位 62 | VDDIO — I/O supply voltage |
| 腳位 63 | GND — Ground |
| 腳位 64 | NC — Not connected (per datasheet) |
典型應用
ATSAMD51J18A-AF 適用於 6 應用s: Industrial HMI Touch Panels, USB HID / CDC Peripherals, Audio Playback Devices (I2S DACs), Smart Sensor Hubs, Low-Power IoT Edge Nodes, Motor Control and BLDC Drivers.
Industrial HMI Touch Panels
The ATSAMD51J18A-AF suits industrial HMI panels requiring responsive touch and graphics. Its 120 MHz Cortex-M4F with FPU drives LCD controllers and renders UI assets at 60 fps, while the 256 KB Flash stores fonts, icons, and the application. The 12-bit ADC reads panel temperature sensors, and SERCOM channels drive I2C touch controllers. USB Full-Speed supports firmware update via CDC. The extended -40C to +125C range handles factory floor conditions; integrated DMA offloads touch sampling from the CPU for deterministic response.
推薦
USB HID / CDC Peripherals
The integrated USB 2.0 Full-Speed Device/Host/OTG controller makes the ATSAMD51J18A-AF ideal for HID keyboards, mice, CDC serial adapters, and custom USB peripherals. The Cortex-M4F handles HID report descriptors and protocol stacks in 256 KB Flash, while the FPU accelerates any cryptographic processing required by HID-over-USB with security extensions. The 90 ohm differential pair routing guideline matches the on-chip PHY; designers add an ESD array on DP/DN to meet IEC 61000-4-2 for industrial USB ports.
推薦
Audio Playback Devices (I2S DACs)
The ATSAMD51J18A-AF's I2S peripheral and Cortex-M4F FPU make it suitable for digital audio playback applications such as Bluetooth speakers, headphone amplifiers, and home audio streamers. The FPU executes biquad filters and dynamic range compression in real time, while I2S delivers bit-perfect data to external DACs. DMA-driven I2S streams free the CPU for Bluetooth stack management. The 64-TQFP package provides ample GPIO for rotary encoders, button inputs, and LED indicators in consumer audio devices.
推薦
Smart Sensor Hubs
Industrial and IoT sensor hubs benefit from the ATSAMD51J18A-AF's combination of high-performance core, multiple SERCOM channels (UART/SPI/I2C), and 12-bit ADC. The Cortex-M4F runs sensor fusion algorithms such as Kalman filtering and FFT-based vibration analysis in real time. DMA channels move sensor data from SPI/I2C peripherals to SRAM without CPU intervention, leaving bandwidth for edge analytics. Up to 16 ADC channels read analog sensors (temperature, pressure, current) directly, simplifying BOM.
推薦
Low-Power IoT Edge Nodes
The SAM D51's low-power Sleep modes (down to single-digit microamps retention) and 120 MHz active performance let the ATSAMD51J18A-AF serve as an IoT edge node running sensor sampling, edge inference, and LoRa/Wi-Fi/BLE stack management. The Event System links peripherals directly to wake sources without CPU involvement. Designers can shut down unused SERCOM blocks individually for additional savings. The -40C to +125C operating range supports outdoor deployment.
推薦
Motor Control and BLDC Drivers
The ATSAMD51J18A-AF's 120 MHz Cortex-M4F core, hardware PWM timers, and 12-bit ADC support sensorless and sensored BLDC/PMSM motor control loops at high PWM frequencies. The FPU executes field-oriented control (FOC) math without integer scaling penalties, while the ADC's 1 MSPS sample rate enables sub-microsecond current sensing. The 64-TQFP exposes enough GPIO for three-phase PWM, encoder input, and fault detection. The wide supply range allows direct 3.3 V MOSFET driver interface.
推薦
推薦產品摘要
工程參考資料，適用於 ATSAMD51J18A-AF — 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 | ATSAMD51J18A-AU | ATSAMD51J19A-AF | ATSAMD51G18A-MF | ATSAMD51P20A-CF |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-TQFP (10x10 mm) | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-QFN (9x9 mm) | 100-TQFP (14x14 mm) |
| Core | ARM Cortex-M4F @ 120 MHz | Cortex-M4F @ 120 MHz | Cortex-M4F @ 120 MHz | Cortex-M4F @ 120 MHz | Cortex-M4F @ 120 MHz |
| Flash | 256 KB | 256 KB | 512 KB | 256 KB | 1 MB |
| SRAM | 128 KB | 128 KB | 192 KB | 128 KB | 256 KB |
| USB | Full-Speed OTG | Full-Speed OTG | Full-Speed OTG | Full-Speed OTG | Full-Speed OTG |
| ADC | 12-bit 1 MSPS | 12-bit 1 MSPS | 12-bit 1 MSPS | 12-bit 1 MSPS | 12-bit 1 MSPS |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
| Approx. Price (qty 1000) | USD 4.50 | USD 4.50 | USD 5.50 | USD 4.50 | USD 8.00 |
主要差異化特點
- Same-die upgrade paths in identical TQFP footprint (對比ATSAMD51J18A-AU)
- QFN variant for space-constrained designs (對比ATSAMD51G18A-MF)
- Cost-effective tray packaging for prototyping (對比ATSAMD51J18A-AU)
設計說明
Place a 100 nF decoupling capacitor within 3 mm of every VDDIO pin and a single 4.7 uF bulk capacitor near the VDDIN pins. The VDDCORE pin requires a 1 uF low-ESR capacitor placed as close as possible. Use Microchip's SAM D51 design checklist for the DC-DC inductor selection if you enable the on-chip DC-DC converter; the inductor must be 4.7 uH shielded with saturation current above 200 mA.
Route the USB DP/DN pair as a 90 ohm differential with maximum 3 mm length mismatch and continuous ground reference plane beneath. Place the 27 ohm series termination resistors within 4 mm of the MCU pins. For I2S audio, route MCLK, BCLK, and LRCLK as length-matched pairs (<5 mm delta) and keep them away from switching power lines to minimise jitter. The SDHC lines should also be length-matched within 1 mm to meet SD card timing.
Do not leave the RESETN pin floating - it must have a 10 kohm pull-up to VDDIO and a 1 nF capacitor to ground for noise immunity. The NVMCTRL (Flash) controller requires the system clock to be at or below 48 MHz before write/erase operations; configure the NVMCTRL write mode accordingly in your firmware. Enable the WDT (Watchdog Timer) in hardware startup code for reliable industrial deployment.
At 120 MHz with all peripherals active, the ATSAMD51J18A-AF dissipates up to ~200 mW. The 64-TQFP package has a thermal resistance theta_JA of approximately 35 C/W on a 2-layer JEDEC test board, giving a ~7C rise above ambient at full load. Ensure adequate copper pours on VDDIO/GND planes under the exposed pad (if used) and provide minimum 1 square inch of copper for thermal relief at elevated ambient temperatures.
合規資訊
RoHS and REACH compliance confirmed via Microchip product page. AEC-Q100 not qualified - automotive designs should consider the SAM RH71 or SAM E70 family. Halogen-free per Microchip green-compound declarations.
