ATSAM3SD8BA-AU - 512KB Flash Cortex-M3 MCU 64MHz | Microchip
MPN： ATSAM3SD8BA-AU ✓ 啟用中ATSAM3SD8BA-AU 概覽
A 32-bit flash microcontroller is an embedded processing IC that integrates a processor core, program memory, data SRAM, and a rich set of peripherals on a single chip, forming the compute layer of the broader embedded systems hierarchy: Cortex-M3 core -> SAM3S MCU family -> 32-bit microcontroller -> embedded system IC. The SAM3S family descends from the Atmel AVR/ARM legacy and is pin-to-pin compatible with the AT91SAM7S series, providing an easy migration path for legacy designs.
Key features include the ARM Cortex-M3 revision 2.0 core with Memory Protection Unit (MPU) and Thumb-2 instruction set, a high-speed USB 2.0 device port with an integrated transceiver for plug-and-play connectivity, and a core supply domain of 1.08V to 1.32V with 1.62V to 3.6V I/O operation. The 47 general-purpose I/O lines, multiple USART/SPI/TWI serial channels, and a 12-bit DAC on the SD8 variant suit mixed analog-digital designs.
Technically, the device combines a high-speed flash controller with a multi-layer bus matrix, sustaining zero-wait-state execution in large measure and robust EMI tolerance. The integrated USB transceiver eliminates the external PHY, reducing BOM cost and board area. The embedded 12-bit DAC and hardware interleaved Flash architecture differentiate the SAM3SD8 from the SAM3S8 non-DAC sibling.
Typical applications include USB-connected industrial data loggers, test and measurement interfaces, patient monitoring accessories, and consumer appliances requiring USB firmware upgrade capability and moderate analog output capability.
For design, decouple the VDDCORE domain carefully and observe the 1.62V to 3.6V I/O constraint; the internal 1.2V core regulator requires an external output capacitor per the reference design.
This page synthesizes distributor pricing, verified alternatives, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 ATSAM3SD8BA-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： ATSAM3SD8BA-AU （相同外形與佔位） — 差異在於 RoHS Status, Supply Voltage, Core Processor, Package, Series.
ATSAM3S8BA-AU
✅ 直接替換聯絡詢價
查看資料表 →ATSAM3N4BA-MU
✅ 直接替換聯絡詢價
查看資料表 →ATSAM3SD8BA-MUR
✅ 直接替換聯絡詢價
查看資料表 →ATSAM3U4CA-AU
✅ 直接替換📋 參考替代品（不在目錄中）
ATSAM3SD8BA-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 | 64 MHz |
| Flash Memory | 512KB (512K x 8) |
| SRAM | 100KB |
| Core Supply Voltage (VDDCORE) | 1.08 V to 1.32 V |
| I/O Supply Voltage | 1.62 V to 3.6 V |
| Number of I/O | 47 |
| USB | USB 2.0 High-Speed Device with integrated transceiver |
| Memory Protection Unit | Yes (MPU) |
| Instruction Set | Thumb-2 |
| Peripherals | DMA, 12-bit DAC, USART, SPI, TWI, PWM, ADC |
| 封裝 | 64-LQFP (10 x 10 mm) |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40C to +85C (Industrial) |
| RoHS 狀態 | Compliant (LQFP, Green, MRL) |
| 生命週期狀態 | Active |
| Compatibility | Pin-to-pin compatible with AT91SAM7S legacy series |
ATSAM3SD8BA-AU 64-lqfp (10 x 10 mm) 腳位配置指南
ATSAM3SD8BA-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： ATSAM3SD8BA-AU.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATSAM3SD8BA-AU 適用於 6 應用s: USB Data Loggers and Interfaces, Industrial Control and Automation Nodes, Test and Measurement Instruments, Medical Monitoring Accessories, Consumer Appliance Control Boards, Legacy AT91SAM7S Design Migration.
USB Data Loggers and Interfaces
The ATSAM3SD8BA-AU's USB 2.0 high-speed device controller with integrated transceiver delivers 480 Mbps transfers for fast data up/downloading, which is the defining requirement of industrial data loggers and PC-connected measurement interfaces. With 512KB Flash and 100KB SRAM, the MCU holds a USB mass-storage or CDC stack alongside the logging application without external memory. Placed as the single system controller, it enumerates plug-and-play on any host while its 1.62V to 3.6V I/O domain connects directly to 3.3V sensors. The robust EMI tolerance of the integrated PHY reduces external filtering needs, cutting BOM cost versus PHY-less MCU solutions requiring an external USB transceiver.
推薦
Industrial Control and Automation Nodes
In factory automation, the ATSAM3SD8BA-AU combines a 64 MHz Cortex-M3 with 47 GPIO lines, multiple USART/SPI/TWI channels, PWM timers, and an industrial -40C to +85C temperature grade, making it a strong single-chip control node for motor-adjacent logic, valve controllers, and sensor aggregation. The MPU supports partitioned firmware with privileged RTOS kernels for functional robustness, while Thumb-2 code density keeps 512KB Flash sufficient for protocol-heavy applications. Its pin-to-pin compatibility with the AT91SAM7S legacy series allows migration of aging AT91SAM7S designs without PCB respin, extending the service life of installed industrial platforms at minimal engineering cost.
推薦
Test and Measurement Instruments
Handheld and benchtop measurement accessories benefit from the ATSAM3SD8BA-AU's blend of fast USB upload, 12-bit on-chip DAC for test-signal generation, and ADC inputs for measurement acquisition. The 64 MHz core executes calibration math and DSP-lite filtering in real time, while the DAC provides stimulus output for sensor characterization - a differentiator versus the DAC-less SAM3S8. The 100KB SRAM buffers waveform captures before high-speed USB transfer to a host. Because the device is active-lifecycle with broad distributor availability (11 sources via Octopart as of 2026-09-19), instrument makers can rely on long-term sourcing for service and production builds alike.
推薦
Medical Monitoring Accessories
Portable patient-monitoring accessories such as vital-sign pods and clinical data adapters require quiet analog, dependable USB connectivity, and industrial temperature margins, all of which the ATSAM3SD8BA-AU provides. The dual-rail architecture isolates the 1.08V to 1.32V core domain from the 1.62V to 3.6V I/O/analog domain, reducing digital noise coupling into measurement front ends. The 12-bit DAC can drive calibration or alarm-tone outputs, and the 480 Mbps USB link uploads patient data quickly to a monitor host. Designers should follow the datasheet's power-decoupling and VDDANA guidance to preserve signal integrity in the analog path.
推薦
Consumer Appliance Control Boards
White-goods and small-appliance controllers use the ATSAM3SD8BA-AU for its combination of cost-effective 32-bit compute, USB service port for in-field firmware updates, and rich PWM/timer resources for actuator and display driving. The green LQFP package meets environmental directives, and the 512KB Flash comfortably holds GUI command sets, sensor-fusion routines, and USB DFU bootloaders concurrently. The 47 I/O lines interface LED arrays, keypads, and motor driver ICs directly at 3.3V logic. The pin-compatible SAM3S family lets appliance makers scale memory or peripherals across product tiers with a single PCB platform, amortizing layout and certification effort.
推薦
Legacy AT91SAM7S Design Migration
Microchip explicitly positions the SAM3S family as pin-to-pin compatible with the AT91SAM7S legacy series, and the ATSAM3SD8BA-AU is the natural drop-in upgrade for AT91SAM7S boards approaching end-of-life sourcing risk. The Cortex-M3 revision 2.0 core with Thumb-2 delivers substantially higher throughput than the ARM7TDMI predecessor at the same 64 MHz-class clock, and 512KB Flash exceeds typical AT91SAM7S densities. Firmware requires peripheral-driver porting, but the identical 64-LQFP footprint means no PCB revision - a decisive advantage when recertification cost outweighs redesign. Verified active lifecycle status and 11-distributor availability further de-risk the migration window.
推薦
推薦產品摘要
工程參考資料，適用於 ATSAM3SD8BA-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 | ATSAM3S8BA-AU | ATSAM3N4BA-MU | ATSAM3U4CA-AU |
|---|---|---|---|---|
| Package | 64-LQFP (10 x 10 mm) | 64-LQFP (10 x 10 mm) - same | 64-LQFP - same | 64-LQFP |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology (Atmel) |
| Flash Memory | 512KB | 512KB | 512KB | 256KB (2 x 128KB dual-bank) |
| USB High-Speed | Yes (integrated transceiver) | Yes | No | Yes (high-speed) |
| 12-bit DAC | Yes | No | No | No |
主要差異化特點
- Integrated 12-bit DAC (對比ATSAM3S8BA-AU)
- USB 2.0 high-speed with integrated transceiver (對比ATSAM3N4BA-MU)
- Largest memory in the SAM3S 64-LQFP tier (對比ATSAM3U4CA-AU)
設計說明
The ATSAM3SD8BA-AU uses a dual-rail architecture: VDDCORE must be held at 1.08V to 1.32V while VDDIO/VDDANA accept 1.62V to 3.6V. The internal 1.2V regulator requires the datasheet-specified output capacitance on its VDDCORE pin - do not omit it, or the core rail may oscillate during flash programming. Estimated: at 64 MHz the core current is typically in the tens of mA range per the SAM3S datasheet current-consumption tables, so a single 3.3V LDO input with a low-ESR 10uF bulk plus 0.1uF per supply pin is a reliable starting point.
Place 0.1uF ceramic decoupling capacitors within 2 mm of each VDDIO and VDDCORE pin pair, with one bulk 10uF per supply domain. Route the USB D+/D- pair as a 90-ohm differential pair with length matching better than 1 mm; the integrated high-speed transceiver still needs controlled-impedance layout at 480 Mbps. Keep the VDDANA domain on a quiet island with its own ferrite bead and local 1uF + 10nF caps when using the ADC/DAC, since switching noise on the analog rail directly degrades the 12-bit converter effective number of bits.
Designers migrating from AT91SAM7S must not assume identical register maps - the SAM3S peripheral programming model differs even though the pinout is compatible, so re-verify the PIO multiplexer table for every pin before board sign-off. Also remember the I/O domain is limited to 3.6V absolute maximum: 5V-tolerant logic does not exist on this part, so level-shift any 5V signals. Finally, the USB high-speed PHY requires the correct crystal/oscillator accuracy per the datasheet USB chapter; marginal clock accuracy is the most common cause of enumeration failures.
合規資訊
Mouser listing describes the package as 'LQFP, Grn, IT, MRL' indicating green (halogen-free), lead-free, industrial temperature, mold-release-agent compliant construction. REACH and conflict-minerals status not stated in provided data.
