The SiS USI Stylus Controller is an active stylus controller which is compliant to the USI Stylus and Device Technical Specification.
The controller contains low power 32-bit RISC processor with various interfaces including SPI, I2C, UART and four GPIOs for flexible expansion. The adaptive gain control for the DSSS receiver provides high performance and low power for USI uplink packet decode. Three operation modes are supported with MCU frequency control to further reducing power consumption.