The STC15W402AS-35I-TSSOP28 is an 8-bit microcontroller with low power consumption and a wealth of features. It is manufactured by STC and has a TSSOP-28 RoHS package. The device runs on a 12MHz internal oscillator and has 40 KB of Flash, 2 KB of ROM, 1 KB of EEPROM, and 1 KB of RAM. It has an integrated I/O controller, an on-chip debug system, an 8-channel 10-bit A/D converter, an SPI interface, 3 I2C buses, an 8-bit bus controller, two 16-bit timers, three 8-bit timers, two UARTs, a watchdog timer, two programmable I/O ports, and various interrupt sources. The microcontroller is compatible with various IDE, command-line, debug, and other free tools, giving users more options for control and development. Additionally, it is RoHS compliant and compliant with lead-free processes.