PSoC™ 4000 Series Programmable SoCs Infineon Technologies 4000 Series Programmable System-on-Chip (PSoC™) are small members of the PSoC 4 platform architecture. It is a combination of a microcontroller with standard communication and timing peripherals, a capacitive touch-sensing system (CapSense) with best-in-class performance, and general-purpose analog. PSoC 4000 products will be fully upward compatible with members of the PSoC 4 platform for applications and design needs.