HomedatasheetQT118H-DG

QT118H-DG Datasheet

CHARGE-TRANSFER TOUCH SENSOR
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Description

OVERVIEW
The QT118H is a digital burst mode charge-transfer (QT) sensor designed specifically for touch controls; it includes all hardware and signal processing functions necessary to provide stable sensing under a wide variety of changing conditions. Only a few low cost, non-critical discrete external parts are required for operation.
Figure 1-1 shows the basic QT118H circuit using the device, with a conventional output drive and power supply connections. Figure 1-2 shows a second configuration using a common power/signal rail which can be a long twisted pair from a controller; this configuration uses the built-in pulse mode to transmit the output state to the host controller.

● Less expensive than many mechanical switches
● Projects a ‘touch button’ through any dielectric
● 100% autocal for life - no adjustments required
● No active external components
● Piezo sounder direct drive for ‘tactile’ click feedback
● LED drive for visual feedback
● 2.5 ~ 5V single supply operation
● 10µA at 2.5V - very low power drain
● Toggle mode for on/off control (via option pins)
● 10s or 60s auto-recalibration timeout (via option pins)
● Pulse output mode (via option pins)
● Gain settings in 3 discrete levels
● Simple 2-wire operation possible
● HeartBeat™ health indicator on output
● Pb-Free package

APPLICATIONS -
● Elevator buttons
● Toys & games
● Access systems
● Pointing devices
● Appliance control
● Security systems
● Light switches
● Industrial panels

Features

Parameters


Manufacturer information

QUANTUM RESEARCH GROUP

Quantum Research Group was acquired by Atmel.

Quantum Research Group is the leading independent developer of capacitive sensing IP and solutions for user interfaces. Offering a wide variety of touch and proximity sensing solutions, Quantum Research Group is the leading independent supplier of capacitive sensing solutions. Quantum Research Group innovative touchpad navigation technologies support a wide range of markets and applications.


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