TS‐GEVB: Touch Switch Shield Evaluation Board
The touch switch shield evaluation board demonstrates the LC717A00AR which is a high‐performance,
low‐cost capacitance‐digital‐converter LSI for electrostatic capacitive touch sensor, especially focused on
usability. It has 8 channels capacitance‐sensor input. 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 the 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 the recommended switch
pattern is applied. Since LC717A00AR has a serial interface compatible with I2C and SPI bus, the
PCA9655E is used to provide provides 16 bits of General Purpose parallel Input and Output (GPIO)
expansion through the I2C‐bus and SMBus, detecting outputs of the LC717A00AR's 8‐input capacitance
data and measuring it as 8‐bit data.
Evaluation/Development Tool Information
Product Status Compliance
TS-GEVB Active Pb-free
Short Description
Touch Switch Shield Evaluation Board
Parts Used
LC717A00AR-NH , PCA9655EMTTXG
http://www.onsemi.com/PowerSolutions/evalBoard.do?id=TS‐GEVB 4‐6‐17
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