ATSAM4S8CB-CFNR
ATSAM4S8CB-CFNR - 120MHz Cortex-M4 MCU, 512KB Flash, VFBGA-100 | Microchip
The Microchip Technology (formerly Atmel) ATSAM4S8CB-CFNR is a 32-bit ARM Cortex-M4 microcontroller running at up to 120 MHz, integrating 512 KB of Flash and 128 KB of SRAM in a 100-ball 7x7 mm VFBGA package. It is part of the SAM4S family of Flash microcontrollers optimized for low-power, high-performance embedded applications with a rich peripheral set including USB, CAN, and high-speed analog. The 'CFN' suffix indicates the industrial temperature grade (-40C to +85C), the 100-pin BGA package, and a specific Flash/RAM density, while the 'R' suffix denotes Tape & Reel packaging.
An ARM Cortex-M4 microcontroller is a 32-bit RISC processor core based on the ARMv7-M architecture, featuring single-cycle DSP instructions, a single-precision floating-point unit (FPU) in many variants, and a nested vector interrupt controller (NVIC). The Cortex-M4 family is the standard mainstream MCU core for industrial, IoT, and motor-control designs, sitting between the Cortex-M0+ (ultra-low power) and Cortex-M7 (high-end DSP) tiers. SAM4S devices specifically target applications that previously used the SAM7S, SAM3N, and SAM3S families, offering pin-to-pin compatibility with those older designs to enable drop-in upgrades.
Key features of the ATSAM4S8CB-CFNR include a 120 MHz maximum CPU clock with a Memory Protection Unit (MPU), 512 KB embedded Flash with 16 KB additional Flash for user signature, 128 KB SRAM with single-cycle access at full bus speed, and a high-speed Multi-bit ECC block for Flash integrity. The peripheral set includes a USB 2.0 Full-Speed Device with on-chip transceiver, a CAN 2.0A/B controller, up to five USART/UART channels, three TWI (I2C-compatible) ports, three SPI controllers, a 10-bit ADC with up to 16 channels and 1 MSPS conversion rate, a 12-bit DAC, and a 16-bit timer/counter block. The integrated SleepWalking peripheral event system reduces wake-up latency by allowing peripherals to wake the CPU autonomously only when needed.
Architecturally, the SAM4S series uses a 90 nm low-power CMOS process with an on-chip 3.3V core supply generated by an embedded voltage regulator from a single 1.62V to 3.6V external supply. Power consumption is approximately 0.5 mA/MHz active at 1.62V, with multiple low-power modes (Sleep, Wait, Backup) drawing single-digit microamps. The 120 MHz Cortex-M4 delivers 1.26 DMIPS/MHz, putting it ahead of Cortex-M3 and Cortex-M0+ devices for computationally intensive tasks such as motor control, audio processing, and protocol stacks.
Typical applications include industrial automation controllers, building automation gateways, smart energy metering, USB peripherals and HID devices, automotive body and infotainment subsystems, motor control drives (BLDC, PMSM, stepper), graphical user interface boards with TFT displays, and portable medical instruments. The combination of Cortex-M4 DSP instructions, hardware FPU, USB, CAN, and high-resolution timers makes the SAM4S particularly well-suited to real-time control loops and human-machine interface systems. The 100-pin BGA package reduces PCB footprint in space-constrained designs but requires careful routing and reflow profiling.
When designing with this device, pay attention to the BGA land pattern: the 7x7 mm VFBGA uses 0.5 mm pitch balls, which require microvia PCB technology for inner-layer fan-out and proper solder paste stencil aperture design to mitigate tombstoning. Decoupling the VDDIO and VDDCORE pins with 100 nF ceramic capacitors placed within 2 mm of each ball, and providing a bulk 4.7 uF capacitor on VDDIN, are essential for stable operation across the industrial temperature range.
This page synthesizes distributor pricing for the ATSAM4S8CB-CFNR, pin-compatible SAM4S family variants, drop-in alternatives, and practical BGA PCB design notes not consolidated in the manufacturer datasheet alone.
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