EVK1060A【PDF 1/1 页】KIT EVAL FOR AT42QT1060-MMU

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('QT1060') 6 Channel QTouch

Integrated Circuit (IC). In this example, the QT1060 is shown

Using the EVK1060A:

This kit is for the evaluation and development of applications using the AT42QT1060-MMU

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.

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 Suppression TM (AKS TM ) 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:

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 'non-

desired' 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:

? Provides On/Off QTouch TM 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

0x3F

Address

Value

0x3F or 0x00

0x1F

1x EVK1060A Assembly

1x CR2032 Battery, 3V, 235mAh

2x Sample AT42QT1060-MMU ICs

1x EVK1060A User Guide

AKS Feature:

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.

Packed by:

Touch Technology Division

Dated:

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.

1 Mitchell Point

Ensign Way, Hamble

Southampton SO31 4RF

United Kingdom

Patented and patents pending

www.atmel.com

SW1:

Pressing SW1 demonstrates the QT1060's 7th GPIO as an input. LED6 will illuminate when SW1 is

pressed.

Tel: +44 (0)23 8056 5600

Fax:+44 (0)23 8045 3939

qprox.support@atmel.com

REV 100.0908

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