Microchip Technology SAM3A ARM® Cortex®-M3 Flash-Based Microcontrollers

Microchip Technology SAM3A ARM® Cortex®-M3 Flash-Based Microcontrollers feature connectivity peripherals, including a dual CAN interface and high-speed USB (HS USB) MiniHost and device with an on-chip physical layer (PHY). Devices are available in a dual-bank configuration of 256KB and 512KB Flash total and in 100-pin QFP and BGA package options. The architecture is designed to support high-speed data transfers and includes a multi-layer bus matrix plus dual SRAM banks, direct memory access (DMA) channels, and a peripheral DMA controller (PDC) for applications supporting multi-task operations. The SAM3A series is ideal for networking applications in the industrial embedded market and in home and building automation, smart grids, and industrial automation.


  • ARM® Cortex®-M3 revision 2.0 Core running at up to 84MHz
  • Memories
    • 16kb ROM with embedded bootloader routines (UART, USB) and IAP routines
    • SRAM, NOR, NAND support; NAND Flash controller with 4kb RAM buffer and ECC Static Memory Controllers (SMC) 
    • SDRAM Controller
  • System
    • Embedded voltage regulator for single supply operation
    • POR, BOD, and Watchdog for safe reset
    • Quartz or ceramic resonator oscillators: 3MHz to 20MHz main and optional low power 32.768kHz for RTC or device clock
    • High precision 8MHz/12MHz factory trimmed internal RC oscillator with 4MHz Default Frequency for fast device startup
    • Slow Clock Internal RC oscillator as permanent clock for device clock in low power mode
    • One PLL for device clock and one dedicated PLL for USB 2.0 High-Speed Mini Host/Device
    • Temperature sensor
    • Up to 17 peripheral DMA (PDC) channels and 6-channel central DMA plus dedicated DMA for High-Speed USB Mini Host/Device and Ethernet MAC
  • Low Power Modes
    • Sleep and backup modes, down to 2.5μA in backup mode
    • VDDBU pin, RTC, eight 32-bit backup registers backup domains 
    • Ultra-low-power RTC
  • Peripherals
    • 480Mbps, 4kb FIFO, up to 10 bidirectional Endpoints, dedicated DMA USB 2.0 device/mini host 
    • Up to 8-channel 16-bit PWM (PWMC) with complementary output, fault input, 12-bit dead time generator counter for motor control
    • One Ethernet MAC 10/100 (EMAC) with dedicated DMA
    • Two CAN controllers with eight mailboxes
    • One True Random Number Generator (TRNG)
Published: 2019-02-15 | Updated: 2023-05-15