The STC15W408AS-35I-SOP28 is an 8-bit microcontroller manufactured by STC. It is designed using a CMOS technology and features a maximum operating frequency of 35MHz. It has an on-chip 4K × 12-bit RAM, 32 I/O ports, 2 Timers/Event Counters, 5 Capacitive touch sensing channels, two 16-bit PWMs, four sets of 8-level hardware breakpoint register and 6 channels of 10-bit A/D converter. It also features an integrated 8-level hardware stack, UART interface, Watchdog Timer, Low voltage reset and power-down wake up functions. It is packaged in SOP-28_300mil RoHS package, meaning that it is a small outline package with 300 mil lead pitch, made up of RoHS compliant material.