ATSAM3S8BA-AU - Cortex-M3 64MHz 512KB Flash MCU | Microchip
料号： ATSAM3S8BA-AU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $7.89 | $7.89 |
| 10 | $7.49 | $74.90 |
| 100 | $7.1 | $710.00 |
| 500 | $6.75 | $3,375.00 |
| 1,000 | $6.4 | $6,400.00 |
ATSAM3S8BA-AU 概述
A flash microcontroller of this class integrates a processor core, program memory, SRAM, and a rich peripheral set on a single die, sitting in the hierarchy of 32-bit MCU -> ARM-based microcontroller -> embedded processor. The SAM3S family belongs to the Atmel SMART ARM-based MCU line and executes the Thumb-2 instruction set with an integrated Memory Protection Unit (MPU) for robust embedded software architectures.
Key features include the ARM Cortex-M3 revision 2.0 core at 64 MHz, 512KB (512K x 8) of flash program memory, and an integrated full-speed USB 2.0 device transceiver that enables fast data up/downloading without an external PHY. Peripheral connectivity covers I2C (TWI), SPI, UART/USART, SSC (I2S audio), IrDA, memory card (SD/MMC/SDIO), and USB, with 47 general-purpose I/O lines. Supporting peripherals include DMA, PWM, watchdog timer, brown-out detect/reset, and power-on reset.
From an architecture standpoint, the Cortex-M3 Harvard structure with Thumb-2 delivers high code density and deterministic interrupt handling via the Nested Vectored Interrupt Controller. The device operates from 1.8V, 2.5V, or 3.3V supply rails, and the family is documented as pin-to-pin compatible with the legacy Atmel AT91SAM7S series, simplifying migration for existing designs. Native Atmel QTouch capacitive touch support is available across the family.
Typical applications include USB-connected industrial instruments, human-machine interfaces with capacitive touch, motor control and power-monitoring nodes, and data-logging systems that transfer logged data over USB mass-storage or CDC classes.
A key design consideration is supply-domain planning: the device separates VDDCORE and VDDIO supplies, so designers must provide the recommended decoupling and respect the 1.62V-to-3.6V IO range when interfacing with 5V-tolerant or 1.8V logic.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： ATSAM3S8BA-AU ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATSAM3S8BA-AU （相同外形与封装尺寸） ——差异在于 RoHS Status, Package, Flash Memory, Peripherals, SRAM.
快速对比工具——选择替代料号进行并排对比：
ATSAM3SD8BA-AU
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$8.05 / 个
查看数据手册 →ATSAM3S4BA-AU
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATSAM3S2BA-AU
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$4.66 / 个
查看数据手册 →ATSAM3S1BA-AU
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AT91SAM7S512D-AU
✅ 直接替换📋 参考替代料（不在目录中）
ATSAM3S8BA-AU 最大额定值与电气特性
| Core Processor | ARM Cortex-M3 revision 2.0 |
| Core Size | 32-bit |
| Maximum Clock Speed | 64 MHz |
| Program Memory Size | 512KB (512K x 8) |
| Program Memory Type | FLASH |
| 电源电压 | 1.8 V / 2.5 V / 3.3 V |
| Number of I/O | 47 |
| Connectivity | I2C, IrDA, Memory Card, SPI, SSC, UART/USART, USB |
| Peripherals | Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT |
| MPU | Yes (Memory Protection Unit) |
| Instruction Set | Thumb-2 |
| 封装 | 64-LQFP (10x10 mm) |
| 安装方式 | SMD (Surface Mount) |
| Packaging | Tray |
| Family Compatibility | Pin-to-pin compatible with AT91SAM7S series |
| Touch Support | Native Atmel QTouch capacitive touch |
| RoHS 状态 | Compliant (LQFP, Grn, MRL per Mouser) |
ATSAM3S8BA-AU 64-lqfp (10x10 mm) 引脚配置指南
ATSAM3S8BA-AU（64-lqfp (10x10 mm) 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： ATSAM3S8BA-AU.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATSAM3S8BA-AU 适用于 6 应用s: USB Industrial Instruments, Capacitive Touch HMI, Data Logging with USB Offload, Motor Control Nodes, IoT Sensor Gateways, Portable and Battery-Powered Devices.
USB Industrial Instruments
The ATSAM3S8BA-AU fits USB-connected test and measurement instruments because its integrated full-speed USB 2.0 device transceiver removes the external PHY, cutting BOM cost and board area while providing robust EMI tolerance for factory-floor environments. Running at 64 MHz with 512KB flash, it comfortably hosts USB CDC or vendor-class firmware stacks plus command parsing and data buffering. Typical usage places the MCU as the instrument's main controller handling front-panel I/O and USB bulk transfers; unlike MCUs requiring external USB PHYs, the SAM3S needs only the D+/D- lines with appropriate series termination, and its 1.8V/2.5V/3.3V supply flexibility eases integration with industrial 3.3V logic.
推荐
Capacitive Touch HMI
Human-machine interfaces benefit directly from the SAM3S family's native Atmel QTouch capacitive touch support: the ATSAM3S8BA-AU implements touch channels on its 47 GPIO without a dedicated touch controller, saving cost in appliances, control panels, and white-goods interfaces. The 512KB flash accommodates the QTouch library alongside graphics or menu firmware, and the Cortex-M3 at 64 MHz provides the scan-rate and response-time headroom required for multi-key, slider, and wheel widgets. Implementation typically multiplexes touch sense lines with LED drive or segment outputs; the main trade-off is scheduling touch scans around other firmware tasks, managed with the DMA and timer peripherals to keep scan timing deterministic.
推荐
Data Logging with USB Offload
The ATSAM3S8BA-AU is a strong fit for battery-powered data loggers: its memory-card connectivity (SD/MMC/SDIO interface) writes sampled data to removable media, while the integrated USB device transceiver provides plug-and-play offload to a PC as a mass-storage or CDC device. The 512KB flash stores both application firmware and a bootloader supporting field updates via USB. In a typical design the MCU samples sensors over I2C or SPI, buffers through SRAM and DMA, and burst-writes to the card; a quantified benefit is that USB offload happens without opening the enclosure, reducing ingress-risk and service time in deployed units. Power domains must be sequenced so VBUS detect works across battery and USB sources.
推荐
Motor Control Nodes
With four PWM-capable timer channels, DMA, and a 64 MHz Cortex-M3 core, the ATSAM3S8BA-AU serves fan, pump, and small-motor control nodes that need speed-command inputs and status reporting over USB or UART. The 47 I/O lines cover gate or driver interfaces, encoder inputs, and fault feedback, while the brown-out detector and watchdog ensure safe PWM shutdown on supply anomalies - important when controlling inductive loads. Typical usage pairs the MCU with an external gate driver or MOSFET stage; the PWM peripheral generates complementary or independent outputs with dead-time control in hardware. The main design consideration is separating the noisy power ground from the MCU analog ground to protect ADC accuracy and touch sensing.
推荐
IoT Sensor Gateways
As a gateway aggregating I2C and SPI sensors toward a host, the ATSAM3S8BA-AU offers multiple TWI and SPI controllers plus UART/USART channels, allowing simultaneous links to several sensor buses and an upstream modem or host at 3.3V logic. The 512KB flash and SRAM hold protocol stacks (Modbus, custom frames) with margin for firmware evolution, and the SSC peripheral with I2S support handles digital microphones or audio front-ends for acoustic sensing nodes. The device's 1.62V-to-3.6V VDDIO range matches common sensor rails directly, avoiding level shifters. Designers should exploit DMA on all serial links so the 64 MHz core remains free for protocol processing and local filtering rather than byte-level servicing.
推荐
Portable and Battery-Powered Devices
The SAM3S series is marketed for low-power benefits, and the ATSAM3S8BA-AU suits portable devices needing USB charging or data connectivity: handheld meters, readers, and accessories. The Cortex-M3 achieves high performance per clock, letting firmware finish tasks quickly and return to low-power wait modes, while supply options of 1.8V, 2.5V, and 3.3V allow direct connection to single-cell-regulated rails. In practice the USB transceiver is powered only during connection events, and wake sources (USART, TWI, RTC) keep standby current low between sessions. The key trade-off versus dedicated low-power MCUs is verifying sleep-state currents against the datasheet electrical characteristics for the specific sleep mode selected.
推荐
推荐产品汇总
工程参考数据： ATSAM3S8BA-AU ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ATSAM3SD8BA-AU | ATSAM3S4BA-AU | ATSAM3S2BA-AU | AT91SAM7S512D-AU |
|---|---|---|---|---|---|
| Package | 64-LQFP (10x10 mm) | 64-LQFP - same | 64-LQFP - same | 64-LQFP - same | 64-LQFP - same (pin-to-pin compatible) |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology (Atmel) |
| Core / Max Speed | ARM Cortex-M3 @ 64 MHz | ARM Cortex-M3 @ 64 MHz | ARM Cortex-M3 @ 64 MHz | ARM Cortex-M3 @ 64 MHz | ARM7TDMI @ 55 MHz |
| Flash Memory | 512KB | 512KB | 256KB | 128KB | 512KB |
| USB Device Support | Yes (integrated full-speed transceiver) | Yes (integrated transceiver) | Yes (integrated transceiver) | Yes (integrated transceiver) | Yes (USB device) |
关键差异点
- 512KB flash is the largest in the 64-pin SAM3S family （对比 ATSAM3S4BA-AU)
- Modern Cortex-M3 core vs legacy ARM7TDMI migration path （对比 AT91SAM7S512D-AU)
- Integrated USB transceiver saves external PHY （对比 ATSAM3S4BA-AU)
- Trade-off: ATSAM3SD8BA-AU adds hardware SD/MMC bridge （对比 ATSAM3SD8BA-AU)
设计说明
The ATSAM3S8BA-AU uses separated supply domains: VDDCORE for the core (regulated from VDDIN via the internal regulator) and VDDIO for I/O banks. Follow the SAM3S datasheet reference schematic exactly - place the recommended output capacitor on VDDOUT and decouple every VDDIO pin with 100 nF ceramics placed within 2-3 mm of the pin. Do not power VDDCORE directly from an external rail unless you intentionally bypass the internal regulator per the datasheet's alternate configuration; incorrect core supply is the most common cause of non-boot SAM3S boards.
For the USB device interface, route D+ and D- as a 90-ohm differential pair with matched lengths, and place the series resistors and ESD protection close to the connector. The integrated transceiver means no external PHY, but the pair still should not cross plane splits. Keep the 480-ohm (as applicable per reference design) or datasheet-specified D+ pull-up handled by the MCU per USB device default. For crystal layout, keep XIN/XOUT traces short, guard with ground, and place load capacitors directly at the pins to ensure the 64 MHz PLL reference is stable from a clean 8-12 MHz crystal startup.
Three recurring SAM3S pitfalls: (1) The ERASE pin asserts full flash erase when pulled high - never leave it on a user-accessible switch without pull-down; (2) program the GPNVM bits carefully when switching boot mode to flash, since a wrong GPNVM state can brick boot until an ERASE cycle recovers it; (3) the 64-LQFP has no 5V-tolerant I/O - applying 5V logic to PA/PB pins stresses the pads, so level-shift 5V signals. Also validate that SD-card VDD is sequenced before or with VDDIO to avoid back-powering the MCU through I/O protection diodes.
If using the QTouch capacitive touch capability, allocate touch pads on a hatched ground plane with clearance per the Atmel QTouch design guide, and route sense lines away from PWM, USB, and crystal signals to prevent coupling that causes ghost key detection. Schedule touch acquisition with a timer interrupt and use the DMA to move samples so scan timing stays constant regardless of main-loop load - variable scan timing is the leading cause of inconsistent touch sensitivity in QTouch designs on Cortex-M3 SAM parts.
合规信息
Mouser lists the package as "LQFP, Grn, MRL" indicating green (halogen-free/RoHS) package. REACH and conflict-minerals status should be confirmed on Microchip's official compliance documentation.