The STC15W4K16S4LQFP32 with LQFP-32(7x7) is a Microcontroller Unit (MCU/MPU/SOC) ROHS manufactured by STC. It is built around an 8051-compatible 16-bit STC15W4K family CPU. This MCU has a 16k-byte on-chip Flash program memory and an extremely rich peripheral set. It also contains 4-channel 10-bit high-speed Analog to Digital Converter (ADC), three 16-bit Timer/Counters, 3 UARTs, SPI, I2C, and two extra PWM outputs. It also features a low power shutdown mode, a programmable power-saving core timer and power-saving functions for different devices. The MCU can be programmed using on-chip Flash program memory for programming and debugging. This MCU is RoHS compliant and is built in a LQFP-32(7x7) package with a maximum operating voltage of 5.5v.