Using the EVK1060A:
This kit is for the evaluation and development of applications using the AT42QT1060-MMU
TM
('QT1060') 6 Channel QTouch Integrated Circuit (IC). In this example, the QT1060 is shown
working in a battery powered 'Standalone' mode, but can connected to a PC and/or User application
by simple modifications/connections to the EVK1060A Evaluation Board.
The EVK1060A is configured with 6 capacitive keys (one as a 'Guard Channel'), 6 General Purpose
Inputs/Outputs (GPIO's) as Outputs (LED 0 - 5) and the seventh GPIO as an input channel (SW1).
Please refer to the QT1060 datasheet available at www.atmel.com for full details.
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Ensure the EVK1060A Evaluation Board has 6x clear feet fitted to underside of the PCB.
Insert the CR2032 3V battery provided into the battery holder on the EVK1060A.
Ensure that the battery has the correct orientation (negative (-) side to board) or the
EVK1060A will not work.
The LEDs will illuminate in a set sequence, then extinguish.
Touch and hold the ON/OFF symbol - Power LED will illuminate indicating power to the
QT1060. Remove touch from the ON/OFF symbol.
Touch any of the 5 key(s) (Rewind (K0), Play (K1), Pause (K2), Forward (K3), Stop (K4)) on
the EV1060A and the corresponding LED(s) will illuminate. (The number of LED(s)
illuminated will depend on the Adjacent Key SuppressionTM (AKSTM ) feature setting at J1)
If the Guard Channel (K5 which surrounds K0 - K4) is touched, then LED5 will illuminate.
Touch and hold the ON/OFF symbol - The Power LED will extinguish to indicating power to
the QT1060 has been removed. Remove touch from the ON/OFF symbol.
The EVK1060A will power off after approximately 3 minutes of inactivity.
Guard Channel:
D1: 0 Ohm
Resistor fitted
D1: Fit Diode
when connecting
to external supply
D2: Fit Diode
when connecting
to external supply
K5 Electrode surrounds K0 - K4 electrodes and LED5 is driven by the 5029 to show when touch is
detected on this channel. When AKS feature is on, this channel will can be used to indicate 'nondesired' touches (e.g. when a product is in a pocket or against an ear) and can be used to advise
the User's host chip to ignore touches on other keys.
3mm
2mm
5mm
4.5mm
The width of the K5 electrode varies to show the Guard Channel effect. Compare the effect of
touching at the 2mm wide area to the effect at the 5mm wide area.
External Keyboard/Electrodes:
The EVK1060A can be connected to user electrodes, using pads adjacent to R0 – R5 and cutting
the associated 6 tracks (LK4 - LK9 on the schematic).
The EVK1060A can be divided, if required, (a cutting tool is required) to separate the QT1060A
circuit from the power and 5029 circuit.
Input/Output:
The EVK2160A can be connected to User applications through I2C, using the /CHG, SCL, SDA
pads.
The Plug-In USB card, Part Number 9206, which uses Atmel’s AT90USB64 IC, can be connected to
the connector J3. PC based software is available to further evaluate the QT1060 settings.
The seven GPIO’s are available at the pads on the top edge of the EVK1060A.
Sense Capacitors/Sensitivity:
C0 - C5 can be replaced with different value X7R capacitors to change the sensitivity of each of the
channels K0 - K5 respectively. Increasing the capacitor values will increase sensitivity and
decreasing the capacitor value will decrease the sensitivity. (All flux residues should be removed
after component replacement.)
The sensitivity of all channels will increase if any pad/component connected to ground is touched.
Compare touching a key when the EVK1060A is on a desk, to when the EVK1060A is picked up
and held at the GND PAD.
Power Supply:
An external power supply can be used instead of the supplied battery, but ensure that Schottky
diodes are fitted to D1 and D2 to prevent cross powering of USB and battery sources.
It is advised to remove the battery when using an external power supply.
5029:
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Provides On/Off QTouchTM button, including auto power-off
Determines whether connected to USB port/external I2C
Sets the QT1060 through I2C: Default values except:
EVK1060A Kit Contents:
Address
Value
Address
Value
Address
Value
16
17
18
19
15
15
15
15
20
21
22
23
12
8
1
0x3F
25
26
27
30
0x3F or 0x00
0
0x1F
2
1x EVK1060A Assembly
1x CR2032 Battery, 3V, 235mAh
2x Sample AT42QT1060-MMU ICs
1x EVK1060A User Guide
AKS Feature:
Packed by:
Dated:
On the EVK1060A, the AKS feature is a global setting for the 6 capacitive keys.
The AKS mode is changed by moving the 2-way link fitted to J1 as indicated.
Touch Technology Division
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1 Mitchell Point
Copyright © 2008 QRG Ltd.
Ensign Way, Hamble
All rights reserved
Southampton SO31 4RF
Patented and patents pending
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If AKS feature set to 'On' (link on Pins 1 and 2): When touching multiple keys, only the LED
associated with the key with the strongest signal is lit. The Guard Channel (K5) is configured to
give the strongest signal (large electrode and largest sense capacitor (C5) value)
If set to 'Off' (link on Pins 2 and 3): When touching multiple keys, multiple LEDs will be lit.
SW1:
Pressing SW1 demonstrates the QT1060's 7th GPIO as an input. LED6 will illuminate when SW1 is
pressed.
TM
United Kingdom
www.atmel.com
Tel: +44 (0)23 8056 5600
[email protected]
Fax:+44 (0)23 8045 3939
REV 100.0908