ATSAM3S4AA-MU - 64MHz Cortex-M3 256KB Flash MCU | Microchip
部品番号: ATSAM3S4AA-MU ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $5.61 | $5.61 |
| 10 | $5.1 | $51.00 |
| 100 | $4.62 | $462.00 |
| 500 | $4.2 | $2,100.00 |
| 1,000 | $3.85 | $3,850.00 |
ATSAM3S4AA-MU 概要
A microcontroller (MCU) is a single-chip computer that integrates a processor core, memory, and peripherals on one die, sitting at the lowest level of the embedded-systems hierarchy: microcontroller -> embedded processor -> SoC. The SAM3S series belongs to Atmel/Microchip's SMART ARM-based MCU family and is pin-to-pin compatible with the legacy AT91SAM7S products in 48- and 64-pin versions, easing migration from older designs.
Key features include an ARM Cortex-M3 revision 2.0 core with a Thumb-2 instruction set, a Memory Protection Unit (MPU), a 128-bit-wide flash access with a memory accelerator for efficient 64 MHz execution, and an internal 1.62V-3.6V single-supply operating range. Peripherals include USB 2.0 device, USARTs, SPI, TWI (I2C), 12-bit ADC, PWM channels, and a real-time clock, enabling compact single-chip designs.
The Cortex-M3 architecture provides deterministic interrupt handling via the Nested Vectored Interrupt Controller (NVIC) and hardware division, making the device well suited for real-time control loops. The embedded flash controller allows in-system programming and the device supports SWD debug through the serial wire debug port.
Typical applications include industrial sensing nodes, consumer HMI devices, USB accessories, battery-powered portable instruments, and legacy AT91SAM7S upgrades where a drop-in performance boost is desired.
A key design consideration: the exposed pad of the QFN-48 package must be soldered to a ground plane for both thermal dissipation and signal-integrity reasons; do not treat it as a no-connect.
This page adds value beyond the datasheet by compiling verified distributor pricing, same-package drop-in alternatives, application guidance, and cross-reference data not found in the manufacturer documentation.
ドロップイン代替品: ATSAM3S4AA-MU — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ATSAM3S4AA-MU （同一形状・フットプリント） — 相違点: Pin Compatibility, Package, SRAM, Flash Memory, Series.
クイック比較ツール — 並列比較する代替部品を選択:
ATSAM3S4BA-MU
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$5.12 / 個
データシートを見る →ATSAM3S8BA-MU
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$5.72 / 個
データシートを見る →ATSAM3S2AA-MU
✅ ドロップイン✓ 在庫あり
$3.6 / 個
データシートを見る →ATSAM3S1AA-MU
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$3.34 / 個
データシートを見る →ATSAM3N4BA-MU
✅ ドロップイン✓ 在庫あり
$3.48 / 個
データシートを見る →ATSAM3S4AA-MU 最大定格＆電気的特性
| Core Processor | ARM Cortex-M3 revision 2.0 |
| Core Size | 32-bit single-core |
| 最大クロック周波数 | 64 MHz |
| Flash Memory | 256 KB (256K x 8) |
| SRAM | 48 KB |
| 電源電圧 | 1.62 V to 3.6 V |
| Instruction Set | Thumb-2 |
| Memory Protection Unit | Yes (MPU) |
| Flash Access Width | 128-bit with memory accelerator |
| USB | USB 2.0 device |
| パッケージ | 48-QFN (7x7 mm) with exposed pad |
| 実装タイプ | Surface Mount |
| Communication Interfaces | USART, SPI, TWI (I2C), USB |
| Debug Interface | SWD (Serial Wire Debug) |
| Legacy Compatibility | Pin-to-pin compatible with AT91SAM7S (48/64-pin) |
| Packaging | Tray |
ATSAM3S4AA-MU 48-qfn (7x7 mm) with exposed pad ピン配置ガイド
ATSAM3S4AA-MU (48-qfn (7x7 mm) with exposed pad パッケージ) のピン配置。 このデジタルICには、GPIO、通信インターフェース (UART、SPI、I2C)、および電源ピンが含まれています。代替ピン機能と設定オプションについては、メーカーのデータシートを参照してください。組み込みシステム設計とPCBレイアウトに不可欠です。
詳細なピン配置データはありません: ATSAM3S4AA-MU.
詳細は データシート をご参照ください。
主な用途
ATSAM3S4AA-MU の用途: 6 件s: USB Accessories and HID Devices, Legacy AT91SAM7S Design Migration, Industrial Sensor Nodes, Battery-Powered Portable Instruments, Consumer HMI and Display Control, Test and Measurement Peripherals.
USB Accessories and HID Devices
The ATSAM3S4AA-MU integrates a USB 2.0 device peripheral, making it a natural fit for HID keyboards, mice, custom USB gadgets, and CDC virtual-serial adapters. The 256 KB flash accommodates full USB stacks plus application logic without external memory, and the 48 KB SRAM provides generous endpoint buffer space at 64 MHz execution speed. Because the USB transceiver is on-chip, the bill of materials stays minimal - typically only a 1.5 kOhm pull-up is handled internally and a 3.3 V rail is needed. Designers should route D+/D- as a controlled-impedance pair and place the exposed-pad ground connection solidly to reduce EMI on the USB lines.
おすすめ
Legacy AT91SAM7S Design Migration
Atmel explicitly documented that the SAM3S series is pin-to-pin compatible with AT91SAM7S legacy products in 48- and 64-pin packages, making the ATSAM3S4AA-MU the standard migration path for aging AT91SAM7S-based boards facing end-of-life pressure. A board redesign is not required: the land pattern, supply pins, and peripheral multiplexing map directly. The upgrade doubles flash to 256 KB, raises SRAM to 48 KB, and increases core speed to 64 MHz with the Cortex-M3 Thumb-2 pipeline and MPU. Firmware requires porting from the ARM7TDMI toolchain to the Cortex-M3 (NVIC vector table changes), but the peripheral register model remains close to the SAM7S heritage.
おすすめ
Industrial Sensor Nodes
In factory sensing nodes, the ATSAM3S4AA-MU combines a 12-bit ADC, USART/SPI/TWI interfaces, and PWM outputs to digitize and transmit sensor data over RS-485-style USART links or I2C buses. Its 1.62 V to 3.6 V supply range tolerates noisy industrial rails, and the Cortex-M3 NVIC delivers deterministic interrupt latency for time-critical sampling loops at 64 MHz. The exposed-pad QFN-48 package provides good thermal coupling to the PCB for extended temperature environments. The Memory Protection Unit supports partitioned firmware architectures where a bootloader and application must be isolated, improving field-update robustness in unattended industrial deployments.
おすすめ
Battery-Powered Portable Instruments
Handheld instruments benefit from the SAM3S4's single-supply 1.62 V to 3.6 V operation, which allows direct powering from a Li-ion cell across its discharge curve, and from the Cortex-M3's low-power sleep and wait modes that extend battery life between charges. The 64 MHz core executes acquisition, DSP-lite filtering, and display updates in one chip, while the 12-bit ADC samples analog front ends directly. The 48-QFN 7x7 mm footprint fits compact enclosures. Designers should budget the exposed pad as the main ground return and use the RTC and wake-up controller to duty-cycle the system, keeping average current in the microamp range during idle periods.
おすすめ
Consumer HMI and Display Control
The ATSAM3S4AA-MU drives segment LCDs, OLED modules, and resistive-touch front ends in consumer products, using its PWM channels for backlight dimming and its TWI/SPI ports for display controllers. With 256 KB of flash there is room for glyph libraries, multi-language strings, and touch-debounce state machines alongside application logic at 64 MHz. The Thumb-2 instruction set keeps code density high, reducing flash pressure for feature-rich UIs. Because HMI products cycle quickly, the pin-compatibility across SAM3S flash densities (64 KB to 512 KB in the same 48-QFN footprint) lets product teams scale memory up or down across SKUs without changing the PCB.
おすすめ
Test and Measurement Peripherals
Bench accessories - programmable loads, sensor calibrators, dongle-style data loggers - use the ATSAM3S4AA-MU for its deterministic Cortex-M3 timing, 12-bit ADC, and USB device connectivity for PC-linked control. The memory accelerator's 128-bit flash access sustains zero-wait-state execution at 64 MHz, so control-loop jitter stays predictable during measurement sequencing. USB CDC firmware exposes the instrument to host software without custom drivers, while the 48 KB SRAM buffers acquisition data between uploads. The QFN-48 exposed pad simplifies ground-bounce management when analog and digital sections share one PCB, which matters for sub-millivolt measurement accuracy.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ATSAM3S4AA-MU — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ATSAM3S4BA-MU | ATSAM3S8BA-MU | ATSAM3S2AA-MU | ATSAM3S1AA-MU | ATSAM3N4BA-MU |
|---|---|---|---|---|---|---|
| Package | 48-QFN (7x7 mm) EP | 48-QFN (7x7 mm) EP - same | 48-QFN (7x7 mm) EP - same | 48-QFN (7x7 mm) EP - same | 48-QFN (7x7 mm) EP - same | 48-QFN (7x7 mm) EP - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Max Speed | 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 | 512 KB | 128 KB | 64 KB | 256 KB |
| SRAM | 48 KB | 48 KB | 64 KB | 48 KB | 32 KB | 16 KB |
| USB Device | Yes (USB 2.0 device) | Yes | Yes | Yes | Yes | No (SAM3N has no USB) |
| 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 |
| Pin Compatibility | AT91SAM7S 48/64-pin compatible | Pin-to-pin with ATSAM3S4AA | Pin-to-pin with ATSAM3S4AA | Pin-to-pin with ATSAM3S4AA | Pin-to-pin with ATSAM3S4AA | Pin-to-pin with ATSAM3S4AA |
主な差別化要因
- USB 2.0 device peripheral on-chip （vs ATSAM3N4BA-MU)
- Largest flash in the low-cost AA/B-cell family tier （vs ATSAM3S2AA-MU)
- Direct AT91SAM7S legacy upgrade path （vs ATSAM3S1AA-MU)
- Trade-off: lower max clock than some Cortex-M3 competitors （vs STM32F103CB)
設計ノート
The 48-QFN exposed pad on the ATSAM3S4AA-MU is the primary ground connection, not an optional thermal tab. Solder it to a solid ground plane with an array of vias (at least a 3x3 grid of 0.3 mm vias under the pad) to ensure reliable grounding and heat spreading. Insufficient exposed-pad soldering is one of the most common causes of intermittent resets and ADC noise on QFN-packaged SAM3S designs, and it cannot be diagnosed easily after assembly because the pad is hidden beneath the package.
The SAM3S4 accepts a single supply from 1.62 V to 3.6 V, but the integrated regulator architecture requires proper decoupling: place 100 nF ceramic capacitors at each VDD/VDDIO pin pair within 2 mm of the pin, plus a bulk 4.7 uF to 10 uF capacitor near the device. If USB is used, keep the 3.3 V rail within USB-spec tolerances under load. Do not power VDDIO pins from separate rails that ramp at very different rates - unbalanced I/O-pin biasing before core power-up can forward-bias internal protection structures.
Route the USB D+/D- pair as a 90-ohm differential pair with matched lengths (skew under 1 mm) and avoid crossing plane splits. For the SWD debug port (SWDIO/SWCLK), keep traces short and consider adding 0-ohm series resistor locations for current measurement during low-power firmware development. All SAM3S I/O is multiplexed - before layout lock, confirm peripheral-to-pin assignments using the datasheet multiplexing tables so that a late firmware change does not force a PCB respin.
Migration from AT91SAM7S is pin-compatible but not firmware-identical: the Cortex-M3 vector table and NVIC interrupt configuration differ from the ARM7TDMI, and the flash accelerator behaves differently on branch-heavy code. Budget time to revalidate timing-critical loops. Also note the SAM3N series (e.g., ATSAM3N4BA-MU) shares the footprint but lacks USB - dropping it onto a USB design will silently remove the peripheral. Verify the full ordering code suffix before assembly.
コンプライアンス情報
RoHS compliance per Microchip standard for active SAM3S parts; REACH and halogen-free declarations were not present in the retrieved data and should be confirmed on the Microchip product page for the exact date code.
