E3B USER'S GUIDE
for use with the QT310 and QT320 family
The E3B eval board works with
Quantum’s QT31x and QT32x
QTouch ICs. Either type of device
can be inserted into the 8-pin DIP
socket.
QT31x -
single-channel devices
use the QTouch-1 sense pad.
QT32x -
two-channel devices use
both the QTouch-1 and QTouch-2
sense pads.
Both series of devices use the
header strip for feature cloning of
setups or uploading and download-
ing of information to and from a
host such as a PC. The board and these two series of devices are compatible with
QT3View windows software.
For detailed information about the ICs for this board please refer to the QT310
and QT320 datasheets (or datasheets for future devices in these series).
To begin using the board right away:
1.
Insert 2 AAA alkaline batteries into the battery holders. Make sure the small
power switch is ‘off’.
2.
Hold the board in one hand on the battery side of the board, keeping your fingers
away from the QTouch pad areas, and generally the entire lower right quadrant of
the board on either surface to prevent the IC from calibrating to your fingertips.
3.
Turn on the power switch.
4.
Touch either 'QTouch' pad area (QT320) or the QTouch-1 pad (QT310). The
corresponding LED will change state when touched, in a way that depends on
how the chip was setup using the cloning adaptor (see factory defaults).
If you are touching on or around the touch pads when you turn the switch on, it will
calibrate to ignore your fingers. If this happens, take your fingers away and cycle the
power switch again.
Because of Kirchoff's Current Law ("all currents must return to their origin", which also
applies to capacitive fields), the sensor is less sensitive if you are not holding it or if
the board's ground is not electrically coupled to something else. Thus, placing the
board on your desk will result in less sensitivity than if you hold it by the batteries or
connect the board's ground to something larger (or to earth ground).
Unstable operation
will occur if you simply place the board on a desktop and try it,
unless rubber feet are used. The board will rock when touched leading to strong varia-
tions in background signals which will affect operation. Make sure the board is firm
and cannot rock, even by a slight amount.
An external piece of metal foil or a wire loop can be connected to the board and
attached to the rear of a surface of your choice (plastic, glass, wood, or stone will all
work fine) to create fully self-calibrating touch buttons (be sure to connect the board's
ground to something else for best results - or, power from an external power supply.
External power - please note!
When using external power, limit the voltage to 5v
DC max, using the marked connection points. Be sure to remove the batteries first, or
you may cause an explosion or leakage hazard as the batteries will try to charge up
from the external supply!
Overview
Fast Start
Quantum Research Group Ltd. www.qprox.com
US: +1 (412) 391-7367 UK: +44 (0)23 8045 3934 QProx is a trademark of QRG Ltd.
R1.0 03/02
