QT1103

lQ QT1103 QTOUCH™ 10-KEY SENSOR IC This datasheet is applicable to all revision 3 chips DETECT SYNC/LP VSS SNS7K SNS7 SNS6K SNS6 SNS5K The QT1103 is designed for low cost appliance, mobile, and consumer electronics applications. QTouch™ technology is a type of patented charge-transfer sensing method well known for its robust, stable, EMC-resistant characteristics. It is the only all-digital capacitive sensing technology in the market today. This technology has over a decade of applications experience spanning thousands of designs. QTouch circuits are renowned for simplicity, reliability, ease of design, and cost effectiveness. QTouch™ sensors employ a single reference capacitor tied to two pins of the chip for each sensing key; a signal trace leads from one of the pins to the sensing electrode which forms the key. The sensing electrode can be a simple solid shape such as a rectangle or circle. An LED can be placed near or inside the solid circle for illumination. The key electrodes can be designed into a conventional Printed Circuit Board (PCB) or Flexible Printed Circuit Board (FPCB) as a copper pattern, or as printed conductive ink on plastic film. SS /RST VDD OSC N/C SNS0 SNS0K SNS1 24 23 22 21 20 19 18 17 SNS8 SNS8K SNS9 SNS9K N/C /CHANGE 1W RX 25 26 27 28 29 30 31 32 QT1103 1 234 56 78 16 SNS5 15 SNS4K 14 SNS4 13 SNS3K 12 SNS3 11 SNS2K 10 SNS2 9 SNS1K AT A GLANCE Number of keys: 1 to 10 Technology: Patented spread-spectrum charge-transfer (one-per-key mod...