48 MHz Cortex-M0 with integrated CapSense — what this PSoC 4 brings to the BOM
The Infineon CY8C4247AZI-L475 is a 32-bit ARM Cortex-M0 MCU from the PSoC 4 CY8C42xx-L series, clocked at 48 MHz with 128 KB Flash and 16K x 8 RAM. Its headline feature is the integrated CapSense and SmartSense peripheral block, which handles capacitive touch sensing directly — no external touch controller IC needed. The wide supply range from 1.71 V to 5.5 V lets it run from a single 3.3 V or 5 V rail, simplifying the power tree in mixed-voltage designs. With 53 I/O, USB connectivity, and a 12-bit SAR ADC (16 channels) plus four 8-bit DACs, this part targets human-machine interface (HMI) panels, appliance control boards, and industrial sensor nodes that need touch input alongside general-purpose MCU tasks.
CapSense block — no separate touch controller needed
The integrated CapSense and SmartSense peripheral handles self-capacitance and mutual-capacitance touch sensing. SmartSense auto-tunes the sensor parameters during operation, which compensates for overlay thickness variation and environmental drift. For a BOM engineer, this means one less IC to qualify and one less firmware stack to maintain — the touch library runs on the same Cortex-M0 core that handles application code.