ATSAM3U1CB-AU - 96MHz Cortex-M3 MCU | Microchip Technology
MPN： ATSAM3U1CB-AU ✓ 啟用中ATSAM3U1CB-AU 概覽
A microcontroller is a programmable semiconductor that integrates a processor core, memory, and peripherals into one device. The ATSAM3U1CB-AU belongs to the SAM3U family of flash microcontrollers, placing it within the hierarchy of ARM Cortex-M3 microcontroller, 32-bit embedded processor, embedded control IC, and semiconductor. This combination makes the device suitable for systems that require more processing capacity and connectivity than a basic 8-bit controller without moving to a higher-performance Cortex-M4 or Cortex-M7 design.
Key features include operation at 96 MHz, 64 KB of Flash organized as 64K by 8 bits, a Memory Protection Unit, and the Thumb-2 instruction set. The 100-LQFP package exposes the device's high-performance USB device port, high-speed MCI interface for SDIO, SD, and MMC storage, and external bus interface. These interfaces support data acquisition, removable storage, USB-connected control, and embedded industrial equipment.
The Cortex-M3 revision 2.0 core uses a RISC architecture and provides a deterministic embedded processing platform for supervisory control, protocol handling, and real-time peripheral management. The family architecture includes a memory accelerator and dual-bank Flash organization in higher-density members of the series. For the ATSAM3U1CB-AU specifically, the 64 KB Flash capacity requires disciplined firmware sizing while retaining the flexibility of a 32-bit instruction set and a broad peripheral platform.
Typical applications include USB peripheral control, SD or MMC data logging, industrial data-acquisition equipment, networked control panels, medical or laboratory instruments, and compact embedded gateways. The USB device controller is especially useful for a host-connected analyzer or configuration interface, while the MCI interface can connect removable or embedded storage for firmware updates and captured data.
Designers should assign pins according to the 100-pin LQFP pin-description table, preserve the required power, ground, decoupling, and clock connections, and route high-speed USB and memory signals with controlled return paths. The device is intended for surface-mount assembly, so land-pattern, solder-profile, and reflow details should be checked against the manufacturer datasheet before releasing the PCB design.
This page combines the confirmed 96 MHz Cortex-M3 architecture, 64 KB Flash configuration, 100-LQFP mechanical format, and family peripheral capabilities with practical replacement, comparison, and design guidance. It is intended to help engineers identify the correct ATSAM3U1CB-AU variant, evaluate genuine same-package alternatives, and plan a reliable embedded layout before procurement.
直接替換替代品，適用於 ATSAM3U1CB-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： ATSAM3U1CB-AU （相同外形與佔位） — 差異在於 Instruction Set, Memory Protection Unit, Embedded Flash Memory, Package, Product Type.
ATSAM3U4CA-AU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATSAM3U2CA-AU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATSAM3U2CB-AU
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ATSAM3U4CB-AU
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ATSAM3U4CB-AU-AU
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ATSAM3U1CB-AU 最大額定值與電氣特性
| Product Type | 32-bit ARM Cortex-M3 flash microcontroller |
| Maximum CPU Frequency | 96 MHz |
| Processor Core | ARM Cortex-M3 revision 2.0 |
| Architecture | 32-bit RISC |
| Embedded Flash Memory | 64 KB |
| Flash Memory Organization | 64K x 8 bits |
| Instruction Set | Thumb-2 |
| Memory Protection Unit | Yes |
| USB Interface | High-speed USB device port with embedded transceiver |
| Multimedia Card Interface | High-speed MCI for SDIO, SD, and MMC |
| External Bus | External bus interface |
| Package Type | 100-pin LQFP |
| Package Dimensions | 14 mm x 14 mm |
| 安裝類型 | Surface mount |
| 工作溫度範圍 | -40 °C to +85 °C |
| 生命週期狀態 | Active |
ATSAM3U1CB-AU 14 mm x 14 mm 腳位配置指南
ATSAM3U1CB-AU（14 mm x 14 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： ATSAM3U1CB-AU.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATSAM3U1CB-AU 適用於 6 應用s: USB Connected Data Acquisition, SD and MMC Data Logging, Industrial Sensor Gateway, Medical and Laboratory Instrument, External Bus Peripheral Controller, Firmware Update and Configuration Hub.
USB Connected Data Acquisition
The ATSAM3U1CB-AU fits a USB-connected analyzer because its Cortex-M3 core can perform acquisition control and host communication concurrently at up to 96 MHz. The integrated high-speed USB device port simplifies direct connection to a computer, while the 64 KB Flash capacity supports a compact firmware image, configuration tables, and communication routines. Place the device near the USB connector and route D+ and D- as a controlled differential pair with minimal stubs. Validate the complete USB electrical, firmware, and enumeration design under the intended host operating conditions.
推薦
SD and MMC Data Logging
The ATSAM3U1CB-AU is appropriate for industrial logging equipment that stores records on SD, SDIO, or MMC media. Its high-speed MCI peripheral handles storage communication, while the 96 MHz Cortex-M3 processor leaves processing capacity for sensor sampling, timestamp generation, file formatting, and status reporting. Keep the storage interface layout compact and controlled, provide the required pull-up or pull-down networks, and validate signal integrity with the intended media and connector. The 64 KB Flash budget also makes disciplined firmware partitioning important.
推薦
Industrial Sensor Gateway
The ATSAM3U1CB-AU can serve as the embedded controller in a compact sensor gateway that combines local acquisition with USB or removable-storage output. Its 32-bit Cortex-M3 architecture supports protocol handling and supervisory logic at up to 96 MHz, while the 100-LQFP package exposes USB, MCI, and external-bus resources in a compact surface-mount design. Separate sensitive analog grounds from digital return paths, provide local decoupling at every supply pin, and verify the external-bus impedance and termination requirements for the connected peripherals.
推薦
Medical and Laboratory Instrument
The ATSAM3U1CB-AU is suitable for laboratory and medical-instrument control functions requiring deterministic embedded processing, USB connectivity, and removable-storage support. The 96 MHz Cortex-M3 core can supervise sensors, manage user commands, and transfer captured records, while the -40 °C to +85 °C device rating fits many controlled industrial environments. For medical use, complete risk analysis, electrical-safety review, isolation design, and validation of the complete instrument rather than relying on MCU qualification alone.
推薦
External Bus Peripheral Controller
The ATSAM3U1CB-AU can act as the host controller for external-bus peripherals because the SAM3U family includes an external bus interface alongside the 100-pin package’s other communication resources. This arrangement suits compact control systems that need to supervise sensors, memory devices, or communication bridges while also providing USB connectivity. Derive interface timing from the connected peripheral requirements, maintain defined signal levels, and provide adequate return paths. The 64 KB Flash configuration may require modular drivers to conserve code space.
推薦
Firmware Update and Configuration Hub
The ATSAM3U1CB-AU fits a configuration hub that receives commands or firmware through USB and stores operational data on removable media. The high-speed USB device interface supports host-to-device communication, the MCI peripheral supports SD or MMC media, and the Cortex-M3 core can coordinate boot selection, authentication, and status reporting. Implement a robust bootloader with power-loss recovery, validate image boundaries before programming, and test USB enumeration and media compatibility across all supported host and card configurations.
推薦
推薦產品摘要
工程參考資料，適用於 ATSAM3U1CB-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 | ATSAM3U4CA-AU | ATSAM3U2CA-AU | ATSAM3U2CB-AU | ATSAM3U4CB-AU | ATSAM3U4CB-AU-AU |
|---|---|---|---|---|---|---|
| Package | 100-pin LQFP, 14 mm x 14 mm | 100-pin LQFP, 14 mm x 14 mm | 100-pin LQFP | 100-pin LQFP | 100-pin LQFP | 100-pin LQFP |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| CPU Core | ARM Cortex-M3 revision 2.0 | ARM Cortex-M3 revision 2.0 | ARM Cortex-M3 revision 2.0 | ARM Cortex-M3 revision 2.0 | ARM Cortex-M3 revision 2.0 | ARM Cortex-M3 revision 2.0 |
| Maximum CPU Frequency | 96 MHz | 96 MHz | 96 MHz | 96 MHz | 96 MHz | 96 MHz |
| USB Interface | High-speed USB device port with embedded transceiver | High-speed USB device port with embedded transceiver | High-speed USB device port with embedded transceiver | High-speed USB device port with embedded transceiver | High-speed USB device port with embedded transceiver | High-speed USB device port with embedded transceiver |
| Multimedia Card Interface | High-speed MCI for SDIO, SD, and MMC | High-speed MCI for SDIO, SD, and MMC | High-speed MCI for SDIO, SD, and MMC | High-speed MCI for SDIO, SD, and MMC | High-speed MCI for SDIO, SD, and MMC | High-speed MCI for SDIO, SD, and MMC |
| External Bus Interface | Yes | Yes | Yes | Yes | Yes | Yes |
主要差異化特點
- Lower-memory configuration within the 96 MHz SAM3U family (對比ATSAM3U4CA-AU)
- Same processor speed and package as the higher-density family member (對比ATSAM3U4CB-AU)
- Distinct package choice compared with the TFBGA family variant (對比ATSAM3U1CB-CU)
設計說明
Use the manufacturer’s 100-pin LQFP land pattern and pin-description table as the controlling references for PCB construction. Route the USB differential pair as a short, continuous pair away from switching nodes and maintain the specified impedance geometry. Keep the MCI interface traces compact, observe the required pull-up or pull-down arrangements, and provide a continuous ground reference beneath high-speed routes to reduce data-integrity risk.
Place the required input, output, and internal decoupling capacitors close to their associated device pins, with short and low-inductance supply paths. Separate noisy return currents from sensitive signal references and maintain a solid ground plane beneath the device. Validate startup current, regulator headroom, and peripheral load transients at both 96 MHz operation and the lowest intended supply voltage before freezing the power tree.
Do not confuse the 100-LQFP ATSAM3U1CB-AU with ATSAM3U1CB-CU, which uses a TFBGA package and therefore a different land pattern. Also avoid assuming that all ATSAM3U memory-density variants are firmware-interchangeable even when their package and CPU frequency match. Review the device name, pin assignment table, startup configuration, peripheral multiplexing, and linker memory map for every exact replacement MPN.
Follow the clock requirements and external-component recommendations in the manufacturer datasheet. Keep crystal or oscillator routing short, maintain a controlled ground return, and isolate switching circuitry from clock and communication nets. Because the package exposes many peripheral functions in a relatively small land area, review the fanout for simultaneous USB, MCI, and external-bus use, adding layer changes only where return-path continuity remains intact.
合規資訊
The operating temperature range of -40 °C to +85 °C is identified by the LCSC listing. RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals status were not stated in the cited product information.
