This 16 key capacitive touch keypad is based on the TTP229 capacitive sensor with accurate sensing of up to 16 points. Using this keypad provides a solid state alternative to mechanical type keypads providing the advantage of greater durability especially in dusty environments. They keypad can also be configured in different modes providing various key group options upto 16 independent keys. Outs 1 to 8 on the header connector mimic the sates of the first 8 keys. When is 16 key mode the state of all 16 keys can be read via its 2 wire serial interface.