评估板, 触摸开关子板, LC717A00AR电容性数字转换器
The from is a touch switch shield evaluation board. It demonstrates LC717A00AR high performance, low cost capacitance-digital converter LSI for electrostatic capacitive touch sensor, especially focused on usability. The built-in logic circuit can detect the state ON/OFF of each input and output the result. This makes it ideal for various switch applications. The calibration function is automatically performed by built-in logic circuit during power activation or whenever there are environmental changes. In addition, since initial settings of parameters, such as gain are configured, LC717A00AR can operate in stand-alone mode when recommended switch pattern is applied. Since LC717A00AR has a serial interface compatible with I2C and SPI bus, the PCA9655E is used to provide 16bit of general purpose parallel I/O GPIO expansion through I2C bus and SMBus, detecting outputs of LC717A00AR"s 8 input capacitance data and measuring it as 8bit data.