ATSAM4S2BA-UUR
ATSAM4S2BA-UUR - 120MHz Cortex-M4 128KB MCU | Microchip
The Microchip Technology ATSAM4S2BA-UUR is a 32-bit ARM Cortex-M4 RISC microcontroller with 120 MHz maximum operating frequency, 128 KB of Flash memory, and 64 KB of SRAM in a 64-pin WLCSP package. It supports 1.2 V and 3.3 V operation and integrates I2C, SPI, UART, USB, PWM, ADC, and DAC peripherals.
A microcontroller is a programmable semiconductor that combines a processor core, memory, and embedded peripherals on one integrated circuit. The ARM Cortex-M4 belongs to the microcontroller hierarchy and provides deterministic instruction execution for embedded control systems. Within Microchip's SAM4S family, the ATSAM4S2BA-UUR is positioned as a compact, moderately resourced device for connected industrial, communications, and control applications.
The 120 MHz Cortex-M4 core provides substantially greater processing headroom than lower-frequency 8-bit or 16-bit controllers while retaining the simplicity of a single-chip embedded design. Its 128 KB Flash configuration supports embedded firmware, while 64 KB of SRAM accommodates working memory, buffers, stack space, and intermediate processing data. Native QTouch support expands the design options for capacitive buttons, sliders, and wheels.
Communication and conversion peripherals reduce the need for external components in connected control equipment. The device includes I2C and SPI interfaces for sensors and memories, UART for serial links, full-speed USB device connectivity, PWM channels for motor or lighting control, and ADC and DAC functions for measurement and analog signal generation. This integration allows a compact system to process local data and communicate with a host, controller, or service equipment.
Typical uses include industrial sensor nodes, USB-connected data-acquisition equipment, capacitive touch interfaces, compact motor controllers, and embedded communications modules. The 64-pin WLCSP construction favors space-constrained products, but it demands careful PCB design, fine-pitch assembly capability, and deliberate thermal and power planning.
Designers should follow the pin-description table, recommended decoupling configuration, and layout guidance in the manufacturer datasheet. The WLCSP footprint should be reviewed against assembly capability, while USB, analog, and high-speed signal routes require short paths, controlled return-current paths, and appropriate grounding. The MCU should be selected only when its memory and peripheral set match the application without requiring unnecessary firmware complexity.
This page consolidates the exact device identity, package, memory, interface, and application information into an engineering-oriented selection reference. It also distinguishes same-package family options by memory capacity, helping designers assess PCB reuse while recognizing that firmware, pin multiplexing, and peripheral-equivalence checks remain essential before replacement.
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