QT1081 8-Key QTouch™ Sensor IC

For Charge-Transfer Capacitive Touch Sensing

The QT1081 is an improved, lower cost, simplified circuit version of the popular QT1080 sensor IC. The QT1081 is designed for low cost appliance, mobile, and consumer electronics applications.

Please be aware that the QT1081 is not a retrofit part for the QT1080. We will continue to supply the QT1080 for all existing designs, but for new projects the QT1081 is recommended due to enhanced functionality and reduced solution cost. Please be advised that there are no plans to discontinue the QT1080. Please refer to our discontinuation policy for further details.

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.

The QT1081 is also compatible with clear films to make simple button-style touch screens over LCD displays.

Evaluation Board

The E1081 evaluation kit contains a motherboard and a removable eight-button keypad PCB. The E1081 demonstrates the features of the QT1081 device, such as eight-channel touch control, auto recalibration, stuck key detect and Adjacent Key Suppression (AKS™). Removing the keypad allows connection to your own electrodes. The download table, below, provides a link to the user manual and a schematic diagram of the evaluation board. The kit includes the boards and 2 additional QT1081 ICs

Please contact us for price and availability information.

Ordering Information

Download a faxable order form

‡ Price Bands (100k drop price indications, in US$, FOB UK)
A: under $0.50 | B: $0.50 - $0.80 | C: $0.80 - $1.50 | D: over $1.50