Features
- 2V to 5V single supply operation
- 10µA low power mode @ 2V
- Self-calibrating on power-up
- Sensitivity easily adjusted
- Consensus filter for noise immunity
- Autorecalibration timeout
- HeartBeat™ health indicator on output
- Only a few passive external parts required
- RoHS compliant SOT23-6 package
Applications
- Home appliances
- Toys
- Lighting controls
- Stereo systems and TV
Downloads
- QT100 Single channel touch IC
PDF
- Datasheet
- E100S Evaluation board
PDF
- Manual
- QAN0027: 6-pin SOT23 to 6-pin WSON conversion
PDF
- Application note
- QAN0028: Sensitivity differences when migrating from QT100 to QT100A
PDF
- Application note
Related Links
QT100: Single-Channel Touch Sensor IC
Charge-Transfer QTouch™ Chip
IMPORTANT NOTEThe QT100 is no longer recommended for new designs. We are committed to supporting customers currently using this product, but recommend the newly introduced QT100A for any new designs. The QT100A comes in a 10-pin MSOP package or a 6-pin WSON package. The latter is footprint compatible with the QT100 SOT23-6 package. Please visit the QT100A product page for more details. For customers who would like to switch from the QT100 to the QT100A, we can provide application guidance on how to achieve a smooth transition. For details please see the Application notes: QAN0027: 6-pin SOT23 to 6-pin WSON conversion QAN0028: Sensitivity differences when migrating from QT100 to QT100A |
The QT100 charge-transfer ('QT') touch sensor is a self-contained digital IC capable of detecting near-proximity or touch. It will project a touch or proximity field through any dielectric like glass, plastic, stone, ceramic, and even most kinds of wood. It can also turn small metal-bearing objects into intrinsic sensors, making them responsive to proximity or touch. This capability, coupled with its ability to self-calibrate, can lead to entirely new product concepts. It is designed specifically for human interfaces, like control panels, appliances, toys, lighting controls, or anywhere a mechanical switch or button may be found.
Power consumption is less than 500µA in most applications when running in Fast response mode. This typically drops to 5-10µA at 2V Vdd in Low Power mode, depending on the burst length. In most cases the power supply need only be minimally regulated; for example, by Zener diodes or an inexpensive three-terminal regulator. The QT100 only requires a common inexpensive X7R ceramic capacitor in order to function.
The QT100's Reduced Instruction Set Computer (RISC) core employs signal processing techniques pioneered by Quantum; these are specifically designed to make the device survive real-world challenges, such as 'stuck sensor' conditions and signal drift.
The Quantum-pioneered HeartBeat™ signal is also included, allowing a microcontroller to monitor the health of the QT100 continuously,if desired. By using the charge transfer principle, the IC delivers a level of performance clearly superior to older technologies in a highly cost-effective package.
Evaluation Board
The E100S evaluation board has been developed to show the capabilities of the QT100. The board demonstrates the chip in a typical application; a simple through-panel single-switch. The E100S illustrates how a QTouch solution requires only a very simple circuit design and a minimum of external components. See the downloads table below for a schematic diagram of the board.
The kit includes the board and 2 additional QT100 ICs.
E100S Kit Price: US$11.75. Please contact us for availability information.
Ordering Information
| Part # | Alt. Part † | QTouch™ Channels | Notes | Pkg | Temp (°C) | Power (V) | Digi-Key | Farnell |
| QT100-ISG | QT100A | 1 | Not recommended for new designs | SOT23-6 | -40 to 85 | +2 to 5 | Details | Details |
Download a faxable order form
