ATSAM3U1CB-AU - 96MHz Cortex-M3 MCU | Microchip Technology
N.º de pieza: ATSAM3U1CB-AU ✓ ActivoATSAM3U1CB-AU Descripción general
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.
Alternativas directas para ATSAM3U1CB-AU — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ATSAM3U1CB-AU (mismo factor de forma y huella) — difiere en Instruction Set, Memory Protection Unit, Embedded Flash Memory, Package, Product Type.
ATSAM3U4CA-AU
✅ Sustitución directa ⚠️ Especificaciones sin verificarConsulte el precio
Ver hoja de datos →ATSAM3U2CA-AU
✅ Sustitución directa ⚠️ Especificaciones sin verificarConsulte el precio
Ver hoja de datos →ATSAM3U2CB-AU
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
ATSAM3U4CB-AU
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
ATSAM3U4CB-AU-AU
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
ATSAM3U1CB-AU Valores máximos y características eléctricas
| 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 |
| Tipo de montaje | Surface mount |
| Rango de temperatura de funcionamiento | -40 °C to +85 °C |
| Estado del ciclo de vida | Active |
Guía de configuración de pines de ATSAM3U1CB-AU 14 mm x 14 mm
Configuración de pines para ATSAM3U1CB-AU (encapsulado 14 mm x 14 mm). Este CI digital incluye GPIO, interfaces de comunicación (UART, SPI, I2C) y pines de alimentación. Consulte la hoja de datos del fabricante para conocer las funciones alternativas de los pines y las opciones de configuración. Esencial para el diseño de sistemas embebidos y el diseño de PCB.
No hay datos detallados de patillaje disponibles para ATSAM3U1CB-AU.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
ATSAM3U1CB-AU es adecuado para 6 aplicacións: 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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ATSAM3U1CB-AU — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | 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 |
Diferenciadores clave
- Lower-memory configuration within the 96 MHz SAM3U family (frente a ATSAM3U4CA-AU)
- Same processor speed and package as the higher-density family member (frente a ATSAM3U4CB-AU)
- Distinct package choice compared with the TFBGA family variant (frente a ATSAM3U1CB-CU)
Notas de diseño
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.
Información de cumplimiento
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.
