The STC12C5A40S2 with STC LQFP-44_10x10x08P RoHS manufactured by STC is a single-chip 8-bit microcontroller. It has an operating voltage range of 2.0V to 5.5V, and an operating frequency of 40MHz. This chip has an 8K Bytes ROM, 1K Bytes RAM, and a 4K Bytes Flash. It also includes 4 16-bit timers, 3 UARTs, 2 SPI ports, I2C port, 4 10-bit A/D converters, and built-in keyboard scan interface modules. It has a total of 44 pins, which have an LQFP package with a 10x10x08P configuration. This part is lead and halogen free, compliant to the RoHS standard.