120 MHz Cortex-M4 — processing headroom for control and signal chain
The Microchip ATSAM4S8BA-ANR is a 32-bit ARM Cortex-M4 MCU from the SAM4S series, clocked at 120 MHz. The 128 KB SRAM is organised as 128K x 8, which maps cleanly to 32-bit word accesses from the Cortex-M4.
The peripheral list includes I²C, SPI, UART/USART, USB, and a Memory Card interface for SD/MMC storage, plus a 12-bit ADC with 11 channels and a 12-bit DAC with 2 channels.
Package and footprint — 64-LQFP with 47 I/O
Housed in a 64-LQFP package (10x10 mm body), the ATSAM4S8BA-ANR brings out 47 general-purpose I/O pins. The 0.50 mm pitch requires a 4-layer PCB for full fan-out on all 64 leads; a 2-layer board can route the outer rows but will struggle with the inner power and ground pins. The package is RoHS3 compliant per the listing.
Sourced through independent distribution.