QT1103 10-Key QTouch™
Sensor IC

For Charge-Transfer Capacitive Touch Sensing

QT1103 charge-transfer ('QT') QTouch™ IC is a self-contained, patented digital controller capable of detecting near-proximity or touch on up to ten electrodes. It allows electrodes to project independent sense fields through any dielectric such as glass or plastic. This capability coupled with its continuous self-calibration feature can lead to entirely new product concepts, adding high value to product designs. The devices are designed specifically for human interfaces, like control panels, appliances, gaming devices, lighting controls, or anywhere a mechanical switch or button may be found; they may also be used for some material sensing and control applications.

Please be aware that the QT1103 is not a retrofit part for the QT1101. We will continue to supply the QT1101 for all existing designs, but for new projects the QT1103 is recommended due to enhanced functionality and reduced solution cost. Please be advised that there are no plans to discontinue the QT1101. Please refer to our discontinuation policy for further details.

Each of the channels operates independently of the others, and each can be tuned for a unique sensitivity level by simply changing a corresponding external Cs capacitor.

Patented AKS™ Adjacent Key Suppression suppresses touch from weaker responding keys and allows only a dominant key to detect, for example to solve the problem of large fingers on tightly spaced keys.

Spread spectrum burst technology provides superior noise rejection. These devices also have a SYNC/LP pin which allows for synchronization with additional similar parts and/or to an external source to suppress interference, or, an LP (low power) mode, which conserves power.

By using the charge transfer principle, this device delivers a level of performance clearly superior to older technologies yet is highly cost-effective.

Evaluation Board

The E1103 evaluation kit contains a motherboard and a removable ten-button keypad. The boards illustrate the capabilities of the QT1103 IC, including ten-channel touch control, auto recalibration, stuck key detect and Adjacent Key Suppression (AKS™). By removing the eight-button keypad you can easily connect the board to your own electrodes for evaluation purposes.

The Downloads section to the right provides a link to the user manual and a schematic diagram of the evaluation board. The kit includes the boards and 2 additional QT1103 ICs

Please contact us for price availability information.

Ordering Information

* Release Q3 2007

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