ATSAM3S4AA-AUR - 64MHz Cortex-M3 MCU, 256KB Flash | Microchip
MPN： ATSAM3S4AA-AUR ✓ 啟用中ATSAM3S4AA-AUR 概覽
A microcontroller (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals on one die, sitting at the device level of the embedded-systems hierarchy (MCU -> embedded processor -> microcontroller -> system-on-chip). The SAM3S series belongs to the ARM Cortex-M3 class of 32-bit MCUs, which use a 3-stage pipeline Harvard architecture with Thumb-2 instruction set for high code density and deterministic interrupt handling via the Nested Vectored Interrupt Controller (NVIC).
Key features of the ATSAM3S4AA include a Full Speed USB 2.0 Device port with embedded transceiver, a High Speed Multimedia Card Interface (HSMCI) supporting SDIO/SD/MMC, I2C (TWI), SPI, UART and USART serial interfaces, PWM outputs, a 12-bit ADC and a 10-bit DAC, plus brown-out detection/reset and power-on reset for supply supervision. Parallel data capture on the PIO ports allows direct connection of non-standard devices such as low-cost image sensors, with DMA offloading transfers from the CPU.
Technically, the device balances performance and power: the Cortex-M3 core executes from fast Flash with a prefetch buffer, and multiple power-management modes (including wait, sleep, and backup) let designers scale consumption in battery-operated products. The 1.62V minimum supply supports operation directly from single-cell Li-IO stacks via regulators, and the industrial grade rating suits harsh environments.
Typical applications include industrial control panels, consumer appliances, USB-enabled data loggers, SD-card-based instrumentation, battery-powered metering, and touch or sensor front-ends using the on-chip ADC and PWM channels.
A key design consideration: the SAM3S4A is pin-to-pin compatible with the SAM3N4A, so boards can be migrated between series without PCB rework, but USB availability differs between the families - verify the peripheral set before second-sourcing.
This page adds value beyond the manufacturer datasheet by consolidating distributor pricing, verified drop-in alternatives, design notes, and an AEO-optimized FAQ in one place.
直接替換替代品，適用於 ATSAM3S4AA-AUR — 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： ATSAM3S4AA-AUR （相同外形與佔位） — 差異在於 Connectivity, Package, Core Processor, Flash Memory, RoHS Status.
ATSAM3S4AA-AU
✅ 直接替換聯絡詢價
查看資料表 →ATSAM3S4BA-AUR
✅ 直接替換聯絡詢價
查看資料表 →ATSAM3N4AA-AU
✅ 直接替換聯絡詢價
查看資料表 →ATSAM3S2AA-AUR
✅ 直接替換聯絡詢價
查看資料表 →ATSAM3S1AB-AUR
✅ 直接替換聯絡詢價
查看資料表 →ATSAM3S4AA-AUR 最大額定值與電氣特性
| Core Processor | ARM Cortex-M3 |
| Core Size | 32-Bit |
| 最大時脈頻率 | 64 MHz |
| Flash Memory | 256 KB (256K x 8) |
| SRAM | 48 KB |
| Supply Voltage Range | 1.62 V to 3.6 V |
| 工作溫度 | -40C to +85C |
| 封裝 | 48-LQFP (7x7 mm) |
| 安裝類型 | Surface Mount |
| Connectivity | I2C, SPI, USB, MMC/SDIO, UART, USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, DMA, WDT |
| Data Converters | A/D 12-bit, D/A 10-bit |
| USB | Full Speed USB Device with embedded transceiver |
| Program Memory Type | FLASH |
| Packaging | Tape & Reel (suffix R) |
ATSAM3S4AA-AUR 48-lqfp (7x7 mm) 腳位配置指南
ATSAM3S4AA-AUR（48-lqfp (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： ATSAM3S4AA-AUR.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATSAM3S4AA-AUR 適用於 6 應用s: USB Data Loggers and Instrumentation, SD/MMC Storage and Portable Media Devices, Industrial Control and Automation Panels, Battery-Powered Metering and Sensing, Consumer Appliances and HMI Controllers, Embedded Image Sensor Front-Ends.
USB Data Loggers and Instrumentation
The ATSAM3S4AA-AUR fits USB data-logger designs because its Full Speed USB 2.0 Device port has an embedded transceiver, removing the external PHY and its BOM cost while guaranteeing a compliant 12 Mbps link. The 256 KB Flash holds protocol stacks and a bootloader with room to spare, and the DMA controller moves ADC samples into the 48 KB SRAM buffer without CPU intervention, sustaining continuous acquisition between USB bursts. In a typical logger topology the 12-bit ADC samples sensor channels, DMA fills a ring buffer in SRAM, and the USB endpoint streams records to a host PC. Quantitatively, at 64 MHz the Cortex-M3 has ample headroom to run USB, filesystem code, and signal processing concurrently. The trade-off is power: unlike ultra-low-power MCUs, sleep current is moderate, so duty-cycling the 1.62V-to-3.6V rail domain is recommended for battery products.
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SD/MMC Storage and Portable Media Devices
The High Speed Multimedia Card Interface (HSMCI) of the ATSAM3S4AA-AUR supports SDIO, SD, and MMC cards, making it a natural controller for portable recorders, metering devices, and field instruments that archive data to removable media. Running from the 64 MHz Cortex-M3 core, the HSMCI transfers blocks through DMA into the 48 KB SRAM, so firmware can sustain multi-hundred-kilobyte-per-second card throughput while servicing user interfaces over USART or PWM-driven indicators. The 1.62V to 3.6V supply range eases integration in single-cell battery products with a small regulator, and industrial -40C to +85C rating allows outdoor and vehicle-mounted use. Designers should budget card-detect and write-protect GPIOs from the PIO bank, and use the parallel capture mode when interfacing non-standard sensors whose data feeds the same logging pipeline.
推薦
Industrial Control and Automation Panels
With an industrial temperature rating of -40C to +85C, power-on reset, and brown-out detection/reset, the ATSAM3S4AA-AUR is well suited to factory control panels, motor-interface boards, and process controllers that must survive harsh electrical environments. The PWM peripheral drives actuator or dimmer stages directly, multiple USARTs link to PLC backplanes, HMIs, or Modbus networks, and the I2C/SPI buses connect ADCs, EEPROMs, and real-time clocks. The 256 KB Flash accommodates large ladder-style control firmware plus an in-field bootloader, while DMA offloads routine I/O so the 64 MHz core focuses on control loops. The parallel data capture mode on the PIOs is distinctive: it accepts data from devices not compliant with standard memory-read protocols, such as low-cost image sensors used for simple machine-vision checks, streaming into memory without CPU load.
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Battery-Powered Metering and Sensing
Utility meters, environmental monitors, and handheld gauges benefit from the ATSAM3S4AA-AUR's multiple power-management modes, 1.62V minimum supply, and on-chip 12-bit ADC with 10-bit DAC for excitation and calibration loops. In a typical meter topology, the core sleeps between measurement intervals, wakes on RTC or brown-out-supervised events, samples via the ADC under DMA control, writes results to HSMCI-attached removable media or transmits over USART to a comms module, then re-enters sleep. The 48 KB SRAM buffers measurement tables without external RAM, and the 256 KB Flash stores multi-year logging firmware with OTA-style bootloaders. Designers should sequence peripherals through the power-management controller to minimize sleep current, and select the SAM3N4A pin-compatible part only when USB is unnecessary for further power savings.
推薦
Consumer Appliances and HMI Controllers
Home appliances, thermostats, and small appliances need a cost-effective MCU that drives touch interfaces, displays, and communication links concurrently. The ATSAM3S4AA-AUR covers this with its 64 MHz Cortex-M3 for responsive UI code, PWM channels for backlight dimming and buzzer tones, I2C for capacitive-touch controllers and EEPROM configuration storage, and USART for links to Wi-Fi or Bluetooth modules. The 256 KB Flash supports localized string tables and graphical assets, while the 12-bit ADC reads NTC sensors and supply supervision inputs. Consumer designs operating at 0C to +70C still benefit from the -40C to +85C industrial margin, improving reliability at enclosure hot spots near power electronics. Full Speed USB adds a service port for factory diagnostics and firmware updates without a second interface chip.
推薦
Embedded Image Sensor Front-Ends
A differentiating feature of the SAM3S4A is the parallel data capture mode on the PIOs, which collects data from external devices not compliant with standard memory-read protocols - a direct fit for low-cost CMOS image sensors in simple vision products such as presence detectors, barcode aids, and object counters. DMA transfers captured frames to the 48 KB SRAM, offloading the CPU; for small QVGA-grayscale crops or line-scan sensors the on-chip memory suffices, while larger frames stream out over USB to a host. The 10-bit DAC can generate sensor clock or reference bias signals, and the 12-bit ADC handles exposure telemetry. Because frame capture is DMA-driven, the 64 MHz core concurrently runs edge-detection algorithms, making this a compact single-chip solution where a separate FPGA or camera SoC would be overkill.
推薦
推薦產品摘要
工程參考資料，適用於 ATSAM3S4AA-AUR — 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 | ATSAM3S4AA-AU | ATSAM3S4BA-AUR | ATSAM3N4AA-AU | ATSAM3S2AA-AUR | ATSAM3S1AB-AUR |
|---|---|---|---|---|---|---|
| Package | 48-LQFP (7x7 mm) | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Max Frequency | ARM Cortex-M3, 64 MHz | ARM Cortex-M3, 64 MHz | ARM Cortex-M3, 64 MHz | ARM Cortex-M3, 64 MHz | ARM Cortex-M3, 64 MHz | ARM Cortex-M3, 64 MHz |
| Flash Memory | 256 KB | 256 KB | 256 KB | 256 KB | 128 KB | 64 KB |
| 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 | 1.62 V to 3.6 V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
主要差異化特點
- Embedded USB transceiver (對比ATSAM3N4AA-AU)
- Double the Flash at the same footprint (對比ATSAM3S2AA-AUR)
- Parallel capture DMA reduces CPU load (對比ATSAM3S4AA-AU)
- Cost-optimized firmware scaling (對比ATSAM3S1AB-AUR)
設計說明
The ATSAM3S4AA-AUR operates from 1.62V to 3.6V, but peripherals (especially USB) require the VDDUSB domain to be held at 3.0V to 3.6V per the SAM3S datasheet family requirements. Decouple each VDD pin with 100 nF ceramic capacitors placed within 2 mm of the pin, plus one bulk 4.7 uF to 10 uF capacitor per supply domain. Use the on-chip brown-out detector - configure its threshold in firmware so the core never executes from Flash during a rail sag that could corrupt EEPROM-emulated Flash sectors.
Second-sourcing: the SAM3S4A is pin-to-pin compatible with the SAM3N4A, but the SAM3N lacks the Full Speed USB Device port present on the ATSAM3S4AA-AUR. A dual-footprint strategy (same 48-LQFP land pattern accepting either family) only works if the firmware never touches USB registers. Also note that ATSAM3S2AA-AUR and ATSAM3S1AB-AUR fit the identical footprint but have 128 KB and 64 KB Flash respectively - always link your image size against the smallest Flash variant you may qualify.
For the 48-LQFP (7x7 mm) footprint, place the USB DM/DP traces as a 90-ohm differential pair with length matching within 1 mm and route them away from the HSMCI clock lines to prevent crosstalk on the 12 Mbps Full Speed link. Provide a solid ground plane under the MCU; avoid splitting it under the crystal (typically a 3 MHz to 8 MHz main crystal per the SAM3S reference design) and keep the crystal load capacitors adjacent with a guard ground ring.
The HSMCI supports high-speed SD/SDIO clocking; keep CLK, CMD, and DAT0-3 traces under 50 mm with series termination (22 to 33 ohm) near the driver to control ringing on the SD card stubs. When using the PIO parallel capture mode for image sensors, group the data bus and route it over an unbroken ground reference; sampled data integrity at the capture register depends on setup/hold margins that degrade with long, unmatched traces.
合規資訊
Compliance details not explicitly stated in the provided web data. Microchip catalog parts of this generation are typically RoHS-compliant and lead-free, but this must be confirmed against the official Microchip product page before claims are made.