EVK2160A

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. • • • • • • • • 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: • • • 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. • • 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 qprox.support@atmel.com Fax:+44 (0)23 8045 3939 REV 103.0708