ATSAM4S2CB-CFN
ATSAM4S2CB-CFN - 120MHz Cortex-M4 128KB MCU | Microchip
The Microchip Technology ATSAM4S2CB-CFN is a 32-bit ARM Cortex-M4 microcontroller operating at up to 120 MHz, with 128 KB of embedded Flash and 64 KB of SRAM, packaged in a 100-ball, 7 x 7 mm VFBGA package. It belongs to the SAM4S series and combines a high-performance RISC core, extensive connectivity, analog interfaces, and system-control peripherals in one compact surface-mount device. The industrial-temperature designation and green package identify its intended use in industrial embedded systems.
A microcontroller is a programmable semiconductor that integrates a processor core, nonvolatile program memory, working memory, and peripherals on one die. The ATSAM4S2CB-CFN sits within the hierarchy of 32-bit microcontroller, RISC embedded processor, and system-on-chip. Its ARM Cortex-M4 core includes a Memory Protection Unit, DSP instructions, and the Thumb-2 instruction set, allowing real-time control applications to combine deterministic control with useful digital signal-processing capability.
Key resources include 128 KB of Flash organized as 128K x 8, 64 KB of SRAM, and execution at up to 120 MHz. The SAM4S family also provides USB device connectivity and a broad peripheral set for system control, connectivity, and analog interfacing. Native support for Microchip QTouch capacitive sensing expands the device beyond conventional GPIO control into buttons, sliders, and wheel interfaces. These features make the MCU suitable for compact human-interface and connected-control designs.
The ATSAM4S2C family architecture is designed to offer pin-to-pin compatibility with the 48-, 64-, and 100-pin versions of SAM3N and SAM3S, as well as the 64-pin SAM4N and SAM7S families. Compatibility provides a path for board-family standardization, although firmware, electrical limits, peripheral availability, and package construction must still be checked before changing an existing design. The VFBGA package requires careful PCB escape routing and inspection after assembly.
Typical applications include industrial data acquisition, capacitive-touch control panels, USB-connected peripherals, environmental monitoring, compact automation controllers, and embedded human-interface systems. At 120 MHz, the Cortex-M4 core provides ample performance for protocol handling, state-machine control, communications, and moderate signal-processing workloads while retaining a simple embedded architecture.
Design attention should focus on BGA escape routing, decoupling, exposed-pad or thermal management requirements, and firmware support for the selected USB and touch peripherals. Before schematic release, verify the complete pin assignment, package drawing, operating limits, and peripheral availability in the manufacturer datasheet. The ATSAM4S2CB-CFN is also a natural platform for mixed-signal nodes where local sensing, touch detection, communications, and deterministic control must share one compact processor.
This page combines the key device characteristics, practical implementation considerations, package details, and verified drop-in comparison candidates to support faster component selection and board-design review.
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