ATSAM4SD32CB-CFN
ATSAM4SD32CB-CFN - 120MHz Cortex-M4 MCU 2MB Flash | Microchip
The Microchip Technology ATSAM4SD32CB-CFN is a 32-bit ARM Cortex-M4 microcontroller from the SAM4S family, delivering up to 120 MHz core performance with 2 MB of embedded Flash and 160 KB of SRAM, packaged in a 100-ball 7x7 mm VFBGA. The device integrates a single-precision Floating Point Unit (FPU), a Memory Protection Unit (MPU), and up to 4 Kbytes of cache, providing a balanced combination of computational density and deterministic real-time response.
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash), volatile working memory (SRAM), and a rich set of peripherals (timers, communication controllers, ADCs, GPIOs). The ARM Cortex-M4 is a 32-bit RISC core with DSP extensions and an optional FPU, purpose-built for embedded deterministic control in cost- and power-sensitive applications. The SAM4S family extends this core with Microchip-specific peripherals (HS USB, EMAC, CAN, SSC) and aims at industrial, consumer, and connectivity-enabled embedded designs.
Key features of the ATSAM4SD32CB-CFN include 2 MB dual-bank Flash, 160 KB SRAM, full-speed USB Device port with on-chip transceiver, up to 16 peripheral DMA channels, 12-bit ADC, two 16-bit timers, and up to five USART, three SPI, and two TWI (I2C-compatible) interfaces. An integrated 32-bit real-time timer and a 128-bit unique device ID are also provided. The Cortex-M4 core with FPU executes Thumb-2 instructions and DSP blocks at up to 1.25 DMIPS/MHz, allowing digital signal processing workloads to share the same MCU that performs supervisory control.
The architecture uses a multi-layer bus matrix connecting the Cortex-M4 core, Flash controller, SRAM, and peripheral bridges, minimising contention under concurrent DMA transfers. The 100-ball VFBGA (7x7 mm, 0.65 mm pitch) supports compact layouts for space-constrained designs and provides ample GPIO for parallel buses and high-pin-count peripherals. The 1.2 V internal core is regulated from a single 1.62 V to 3.6 V external supply, simplifying power-tree design.
Typical applications include industrial control and Human-Machine Interface (HMI) panels, smart energy metering, USB peripherals (data loggers, HID devices), point-of-sale terminals, building automation gateways, and consumer audio/connectivity hubs. The combination of Cortex-M4 DSP, USB, and large Flash suits firmware-upgradable field devices with on-device signal conditioning.
When migrating existing SAM4S designs, verify revision status: the manufacturer datasheet recommends Revision B silicon for new prototypes and production. Footprint-compatible lower-density SAM4S variants (SAM4SD16, SAM4SA16, SAM4S16, SAM4S8, SAM4S4) share the same 100-ball VFBGA pad map and pinout, simplifying capacity scaling without PCB rework.
This page synthesises distributor pricing, drop-in compatible SAM4S variants, and practical design notes that supplement the manufacturer datasheet with sourcing and replacement context.
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