IQS550EV03 S Azoteq, IQS550EV03 S Datasheet - Page 5

• Manufacturer Part Number: IQS550EV03 S
• Description: Touch Sensor Development Tools Trackpad Demo for IQS550
• Manufacturer: Azoteq

Specifications of IQS550EV03 S

• Tool Is For Evaluation Of: IQS550
• Interface Type: I2C, SPI
• Operating Voltage: 1.65 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C

1 Overview
The IQS550 is a capacitive sensing controller designed for multi-touch applications using
projected capacitance touch panels. The device offers high sensitivity proximity/hover (PROX)
detection and contact detection (TOUCH) through a selectable number of sensor lines (Rx‟s
and Tx‟s).
Touch and proximity positions are calculated to provide multiple X-Y coordinates.
The device has an internal voltage regulator and Internal Capacitor Implementation (ICI) to
reduce external components. Advanced on-chip signal processing capabilities yields a stable
high performance capacitive controller with high sensitivity.
The controller uses the principle of projected capacitance charge transfer on the trackpad.
When a conductive object such as a human finger approaches the sense plate it will decrease
the detected capacitance. Observing the measured results at various sensing points on the
touchpad enables the controller to determine PROX and TOUCH on all channels, and
accurately determine the coordinates on the touch area. Multiple touch positions can thus be
obtained.
Due to the advanced sensitivity of the device, MULTIPLE non-contact (proximity hover) co-
ordinates can also be obtained. These hover co-ordinates can be used to predict the touch
co-ordinate of an approaching user, before the touch is made, allowing innovative user
interface options.
Multiple filters are implemented to suppress and detect noise and track slow varying
environmental conditions, and avoid effects of possible drift. The Auto Tuning (ATI) allows for
the adaptation to a wide range of touch screens without using external components.
An innovative addition, known as a Snap (Click), is also available on each channel. This adds
another output additional to the PROX and TOUCH of each channel.
The trackpad application firmware on the IQS550 is very flexible in design, and can
incorporate standard touch sensors, trackpad / touchscreen areas (giving XY output data) and
conventional snap-dome type buttons, all providing numerous outputs such as Prox, Touch,
Snap, Touch Strength and actual finger position even before physical contact, all in one
solution.
Copyright © Azoteq (Pty) Ltd
All Rights Reserved.
Product N umber 4 0 / P roject N umber 0 / V ersion N umber 5
This d atasheet a pplies t o t he f ollowing A zoteq v
ProxSense
IQ Switch
IQS550 Trackpad Datasheet
®
Revision 1.04
Series
®
ersion:
5
November 2012
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