ATSAM3N1BA-MU
ATSAM3N1BA-MU - 48MHz 64KB Cortex-M3 MCU | Microchip
The Microchip ATSAM3N1BA-MU is an ARM Cortex-M3 microcontroller with a 48 MHz operating frequency, 64 KB of programmable Flash memory, and 8 KB of SRAM, housed in a 64-QFN 9x9 mm package. It provides 47 I/O pins and uses an internal oscillator, making it suitable for cost-sensitive embedded systems that require substantial memory and peripheral integration in a compact surface-mount package.
An ARM Cortex-M3 microcontroller is a 32-bit reduced-instruction-computing core designed for embedded control. In the product hierarchy, it combines a processor core, embedded Flash, static RAM, interrupt control, timers, communication interfaces, and GPIO into one microcontroller IC. The Cortex-M3 revision 2.0 core supports Thumb-2 instructions, while the 24-bit SysTick counter and Nested Vector Interrupt Controller support deterministic event handling in real-time firmware.
Key features include 64 KB (64K x 8) program memory, 8K x 8 RAM, 47 I/O pins, and operation up to 48 MHz. The 64-QFN package provides a compact 9x9 mm surface-mount solution, while the supplied listing identifies tray packaging. The integration of memory, GPIO, and control peripherals can reduce the number of external components in compact industrial, consumer, communications, and control products.
The device is identified as an ARM-based Flash MCU and belongs to the SAM3N family. Verified listings describe it as a 32-bit microcontroller with 64 KB Flash and 8 KB RAM. The available distributor data also identifies a 1.62 V to 3.6 V supply range for ATSAM3N1BA-MU. Detailed peripheral assignments, electrical limits, pin names, and package dimensions must be confirmed against the original Atmel or Microchip datasheet before PCB release.
Typical applications include embedded control panels, low-cost sensor nodes, communications equipment, motor and relay control, industrial automation modules, and compact consumer products. The internal oscillator and integrated memory help simplify clock and memory design, while the 47 I/O pins provide interfaces for sensors, actuators, displays, and serial transceivers. Firmware must be selected for the exact ATSAM3N1BA-MU pinout and peripheral map.
For a new layout, place decoupling close to the supply pins and route high-current or sensitive signals away from switching nodes. Before replacing another MCU, verify package dimensions, pin names, supply limits, peripheral functions, programming requirements, and bootloader compatibility. The SAM3N family is stated to be pin-to-pin compatible with the SAM3S series, but that family-level statement does not automatically establish drop-in compatibility for every MPN or package variant.
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