Manual 20985651

Manual 20985651
Using the EVK2160A:
This kit is for the evaluation and development of applications using the AT42QT2160-MMU
('QT2160') 16 Key QMatrixTM Integrated Circuit (IC). In this example, the QT2160 is shown
working in a battery powered 'Standalone' mode, but can connected to a PC and/or User
application by simple modifications to the EVK2160A Evaluation Board.
In this example, the QT2160 is configured with 8 individual keys plus 8 keys configured as a
slider.
Please refer to the QT2160 datasheet available at www.atmel.com for full details.
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Ensure the EVK2160A Evaluation Board is securely located in the clear molded case.
Insert the CR2032 3V battery provided into the battery holder on the EVK2160A.
Ensure that the battery has the correct orientation (negative (-) side to board) or the
EVK2160A will not work.
The 12 LEDs will illuminate in sequence, then extinguish.
Touch and hold the ON/OFF symbol - LED (D11) will illuminate indicating power to the
QT2160. Remove touch from the ON/OFF symbol.
Touch any of the 8 key(s) on the EVK2160A and the corresponding LED(s) will illuminate.
(The number of LED(s) illuminated will depend on the AKSTM setting at J1)
Touch and/or slide up on the slider area and the corresponding 3 LED(s) will illuminate at
different intensities (using QT2160's PWM capabilities) dependant on the last reported
touched position.
Touch and hold the ON/OFF symbol - The LED (D11) will extinguish to indicating power to
the QT2160 has been removed. Remove touch from the ON/OFF symbol.
The EVK2160A will power off after approximately 3 minutes of inactivity.
0 Ohm Resistor Jumpers and Links have
been omitted in this simplified schematic.
0 Ohm
Resistor fitted
REFER TO TABLE FOR LED COMPONENTS
RLED
RLED
LED
LED
RX
QLED
RSL
CQ
SL_SIG
XMSIG
CSIG
QLED
CQ
LED Component Details:
SL_SIG
XMSIG
RSL
RX
QLED
CQ
LED
RLED
CSIG
XM0
XM1
XM2
XM3
XM4
XM5
XM6
XM7
R38
R41
R44
-
RN2:3
RN2:4
RN2:5
RN2:6
RN2:7
RN2:8
RN2:1
RN2:2
Q8
Q9
Q10
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
C26
C27
C29
C22
C24
C17
C19
C14
C15
C6
C7
D8
D9
D9
D0
D1
D2
D3
D4
D5
D6
D7
R40
R43
R46
RN3:5
RN3:4
RN3:6
RN3:3
RN3:7
RN3:2
RN3:8
RN3:1
C21
C23
C18
C20
C13
C16
C11
C12
SL_LED_1
SL_LED_2
SL_LED_3
5028:
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Provides On/Off QTouchTM button, including auto power-off
Determines whether connected to USB port/external I2C
Sets the QT2160 through I2C: Default AT42QT2160 values (refer to datasheet) except:
Address
10
18
20
21
Value
0x01
0x00
0xA8
0x00
Address
22…29
30…37
38…53
54…69
Value
0x02
0x01 or 0x00
0x1E
0x20
Address
70
73
75
76
Value
0x00
0x1C
0x10
0x00
AKSTM Mode:
On the EVK2160A, AKSTM is a global setting for the 8 individual keys. The AKSTM mode is
changed by moving the 2-way link fitted to J1 as indicated.
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If 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.
If set to 'Off' (link on Pins 2 and 3): When touching multiple keys, all associated LEDs will be lit.
External Keyboard/Electrodes:
The EVK2160A can be connected to User electrodes, using pads X0-X7 and Y0, Y1, and cutting
the associated 10 tracks adjacent to keys K8-K15. Slide the EVK2160A out of the molded case to
access the component side of the board.
Input/Output:
The EVK2160A can be connected to User applications through I2C, using /CHG, SCL, SDA pads.
Three dedicated General Purpose Inputs/Outputs (GPIO’s) are available at the pads connected to
Pins 1, 2 and 28 of the QT2160.
Power Supply:
An external power supply can be used instead of the supplied battery, but ensure that Schottky
diodes are fitted to D12 and D13 to prevent cross powering of USB and battery sources.
It is advised to remove the battery when using an external power supply.
Troubleshooting:
Problem
Potential Solution
EVK2160A does not work
If the Power LED is off, the Auto Power off timeout may
have been exceeded. Touch ON/OFF to restore power.
If using a battery, check that the negative (-) side is facing
the board.
Check/replace battery.
If using an external power supply, check that the correct
connections have been made, and D12 and D13 have been
fitted correctly.
LED(s) stuck on
Ensure the EVK2160A Evaluation Board is mechanically
stable. Movements relative to its surrounding can affect key
reference values.
LED(s) Flash/Erratic behaviour
Check battery condition. Old batteries can cause voltage
drops which will affect the performance of the QT2160.
Do not touch any of the tracks close to the QT2160 (on
either side of the PCB), as this will affect the capacative
signals.
EVK2160A Kit Contents:
1x EVK2160A Assembly
(EVK2160A Evaluation Board in molded box)
1x CR2032 Battery, 3V, 235mAh
2x Sample AT42QT2160-MMU ICs
1x EVK2160A User Guide
Packed by:
!
Dated:
TM
Touch Technology Division
1 Mitchell Point
Copyright © QRG Ltd.
Ensign Way, Hamble
All rights reserved
Southampton SO31 4RF
Patented and patents pending
United Kingdom
www.atmel.com
Tel: +44 (0)23 8056 5600
[email protected]
Fax:+44 (0)23 8045 3939
REV 103.0708
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