QT220 / QT240: 2 and 4-Channel Touch Sensor ICs

With Spread-Spectrum and Discrete Outputs for Touch Controls

QT220 and QT240 QTouch™ ICs are self-contained digital sensor devices capable of detecting near-proximity or touch on 2 or 4 electrodes.

Each of the channels operates independently of the others, and each can be tuned for a unique sensitivity level by simply changing its sample capacitor value. Two speeds are supported, one of which consumes only 90µA of typical current at 4V. Unique among capacitance sensors, the device incorporates spread spectrum modulation for unsurpassed EMC compliance.

These ICs are Ideal for Controls in PC Peripherals or Monitors like the Philips 190X-5FB pictured right.

Operating Modes

All specifications are typical and depend on circuit design and usage.

Evaluation Board

The E240B evaluation board shows how easily a small, single-sided PCB can be designed for diverse applications such as small appliances, monitors or PC peripherals where a low cost, touch sensitive solution is required to enhance the product.

The section of PCB supporting the LEDs can be snapped off to leave a small touch key array with a minimum of components on the board. The board is the size of a credit card

E1240B Kit Price: US$30.00. Please contact us for 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