Atmel QTouch Library User Guide

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equired as shown in the case A of Figure 27. When the Resistive drive is option is not enabled,it is recommended to use 1kOhm resistors on X and Yk Lines external to the UC3L device. Thishardware arrangement is shown in case B.External Discharge modeWhen the External Discharge arrangement is used, a logic-level (DIS) pin is connected to anexternal resistor (Rdis) that can be used to control the discharge of the Capacitors. A typicalvalue for Rdis is 100 kOhm. This value of Rdis will give a discharge current of approximately1.1V/(100 kOhm) = 11 microAmp. The case C shows this arrangement. The Resistive driveoption on the X and Yk lines can be optionally enabled or disabled with this arrangement. Whenthe Resistive drive is option is not enabled, it is recommended to use 1kOhm resistors on X andYk Lines external to the UC3L device.SMP Discharge ModeWhen the SMP Discharge mode arrangement is used, a logic-level (SMP) pin is connected to thecapacitors through external high value resistors for the discharge of the capacitors. The case Dshows this arrangement. The Resistive drive option on the X and Yk lines can be optionallyenabled or disabled with this arrangement. When the Resistive drive is option is not enabled, it isrecommended to use 1kOhm resistors on X and Yk Lines external to the UC3L device.VDIVEN Voltage Divider Enable optionThe VDIV pin provides an option to make ACREFN a small positive voltage if required. The VDIVpin is driven when the analog comparators are in use, and this signal can be used along with avoltage divider arrangement to create a small positive offset on the ACREFN pin. The VDIVENoption can be used optionally with any of the QMatrix modes discussed in the previous sections.Typical values for Ra and Rb are Ra=8200 ohm and Rb = 50 ohm. Assuming a 3.3V I/O supply,this will shift the comparator threshold by 3.3V*(Rb/(Ra+Rb)) which is 20 mV. The VDIVEN pinoption usage in the Internal Discharge mode scenario is shown in case E.SYNC pin optionIn order to prevent interference from the 50 or 60 Hz mains line the CAT can optionally triggerQMatrix acquisition on the external SYNC input signal. The SYNC signal should be derived fromthe mains line and the acquisition will trigger on a falling edge of this signal. The SYNC pinoption can be used with any of the QMatrix modes discussed in the previous sections. TheSYNC pin usage in the Internal Discharge mode scenario is shown in case F.For QMatrix method SMP, DIS, VDIV and SYNC pin options discussed in this Section, Refer toSection 6.3.15.2.13.1208207K-AT42-09/11
A. QMatrix Internal Discharge mode arrangement.Resistive drive enabled on X and Yk LinesAtmelAT32UC3LX2Xn...SensorsX, YSensor0, 0Sensorn, 0Sensor0, mSensorn, mB. QMatrix Internal Discharge mode arrangement.Resistive drive disabled on X and Yk LinesAtmelAT32UC3LX0XnRX0...RXnSensor0, 0Sensorn, 0SensorsX, YSensor0, mSensorn, mY0AYmACAT CS0ModuleY0BYmB...CSmTypical Values:CS:4.7nFn - number of X Linesm - number of Y LinesY0AYmACATModuleCS0Y0BYmB...RX0...RXnCSmTypical Values:CS:4.7nFRX: 1kOhmn - number of X Linesm - number of Y LinesACIFB-ACREFNI/O Pin requirements:X: QMatrix method X LineYA: QMatrix method Yk LineYB: QMatrix method Y LineACIFB-ACREFN: PA16 I/O pinACIFB-ACREFNI/O Pin requirements:X: QMatrix method X LineYA: QMatrix method Yk LineYB: QMatrix method Y LineACIFB-ACREFN: PA16 I/O pinC. QMatrix External Discharge mode arrangement.Resistive drive enabled on X and Yk LinesAtmelAT32UC3LX2Xn...Sensor0, 0Sensorn, 0SensorsX, YSensor0, mSensorn, mD. QMatrix SMP Discharge mode arrangement.Resistive drive disabled on X and Yk LinesAtmelAT32UC3LX0XnRX0...RXnSensor0, 0Sensorn, 0SensorsX, YSensor0, mSensorn, mAtmelAT32UC3LY0AYmACATModuleY0BYmBDISACIFB-ACREFNX2XnCS0Rdis...CSmE. QMatrix Internal Discharge mode arrangementwith Volage Divider option enabled.Resistive drive enabled on X and Yk Lines...Typical Values:CS:4.7nFRdis: 100kOhmn - number of X Linesm - number of Y LinesI/O Pin requirements:X: QMatrix method X LineYA: QMatrix method Yk LineYB: QMatrix method Y LineDIS: CAT-DIS IO pinACIFB-ACREFN: PA16 I/O pinSensor0, 0Sensorn, 0SensorsX, YSensor0, mSensorn, mAtmelAT32UC3LY0AYmACATModuleCS0Y0BYmBRYB0SMPACIFB-ACREFN...RX0...RXnF. QMatrix Internal Discharge mode arrangementwith External Sync option enabled.Resistive drive enabled on X and Yk LinesX2Xn...CSmTypical Values:CS:4.7nFRX: 1kOhmRYB: 1kOhmRYBmn - number of X Linesm - number of Y LinesI/O Pin requirements:X: QMatrix method X LineYA: QMatrix method Yk LineYB: QMatrix method Y LineSMP: CAT-SMP IO pinACIFB-ACREFN: PA16 I/O pinSensor0, 0Sensorn, 0SensorsX, YSensor0, mSensorn, mY0AY0AYmACATModuleCS0...CSmYmACATModuleCS0...CSmY0BYmBVDIVENACIFB-ACREFNRaRbTypical Values:CS:4.7nFRa: 16500 OhmRb: 50 Ohmn - number of X Linesm - number of Y LinesI/O Pin requirements:X: QMatrix method X LineYA: QMatrix method Yk LineYB: QMatrix method Y LineVDIVEN: CAT-VDIVEN IO pinACIFB-ACREFN: PA16 I/O pinY0BYmBSYNCACIFB-ACREFNTypical Values:CS:4.7nFSynchronizesignaln - number of X Linesm - number of Y LinesI/O Pin requirements:X: QMatrix method X LineYA: QMatrix method Yk LineYB: QMatrix method Y LineSYNC: CAT-SYNC IO pinACIFB-ACREFN: PA16 I/O pin121
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Atmel QTouch LibraryUser GuideSuppo
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5.6.11.6.1 Debug Support in the sam
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6.3.16.21 touch_info_t ............
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• ARM: refers to a device in the
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Libraries for AVR microcontrollers
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QMatrix charge transfer is labeled
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Maximum ON DurationIf an object uni
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Setting Variable name Data Type Uni
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Guard ChannelGuard channel in Qtouc
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7 AKS groups are supported by the l
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Data structuresThis section lists t
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The signal gain for each sensor is
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• This function can be called any
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unit16_t qt_measure_sensors( uint16
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Channel NumberingChannel numbering
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qt_reset_sensing()qt_enable_xxx()qt
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Port AAll SNSK pinsterminatedon thi
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Example:Pins A0 ,A3 and A5 of PORT
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Channel 47 N/A N/A N/A N/A N/A X7Y5
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channel 0channel 1channel 2channel
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Disabling and Enabling of Pull-up f
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‣ Recommended threshold should be
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QMatrix acquisitionmethod libraries
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definition is not required.QT_NUM_C
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SNS1 and SNSK1 pins usethe same por
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• It is recommended to disable PU
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Table 4 :List of configurable param
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Number ofchannels requiredfor the a
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2. The above definitions should be
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NUM_Y_LINES_ROTOR_SLIDER_QT_MAX_NUM
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has Four Comparators (AC0A , AC1A ,
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Note: When using the IAR IDE / comp
Page 70 and 71: Figure 5-11: Selecting the right co
Page 72 and 73: SNS1 - SNSK1 & SNS2 -SNSK2QT_NUM_CH
Page 74 and 75: Selecting the right configurationTh
Page 76 and 77: Figure 5-20 : Specifying QMatrix ac
Page 78 and 79: Debug Support in Example applicatio
Page 80 and 81: Support for different compiler tool
Page 82 and 83: Maximum number of rotor / sliders s
Page 84 and 85: Tips on pin assignments for the sen
Page 86 and 87: ATtiny88)v1g1s2(ATtiny461,ATmega16a
Page 88 and 89: X0,X1,X2,X3 are on PB0,PB1,PB2,PB3N
Page 90 and 91: 1. The channel numbers are allocate
Page 92 and 93: SNSK_array[1][1]=0x00; (SNSK odd ma
Page 94 and 95: SNSK_array[1][0]=0x14; (SNSK even m
Page 96 and 97: Figure 5-28: New Design Sensors in
Page 98 and 99: Figure 5-31: Selecting the MCU for
Page 100 and 101: Figure 5-34: Selecting the SNS and
Page 102 and 103: 2. QTOUCH_STUDIO_MASKS needs to be
Page 104 and 105: Figure 5-38: Selecting New Design3.
Page 106 and 107: Figure 5-42: Start window of the co
Page 108 and 109: Figure 5-45: Selecting the X,YA,YB,
Page 110 and 111: The code can be copied using the
Page 112 and 113: ApplicablereleaseQTouch libraries v
Page 114 and 115: Device Specific LibrariesIntroducti
Page 116 and 117: Table 8 Compiler tool chains suppor
Page 118 and 119: maintains the States of QMatrix, QT
Page 122 and 123: Figure 37 QMatrix method schematicQ
Page 124 and 125: Figure 39 QMatrix API Flow diagram
Page 126 and 127: CAT Module Pin NameCSA0CSB0CSA1CSB1
Page 128 and 129: The QTouch method acquisition using
Page 130 and 131: Host Application codeUsing the init
Page 132 and 133: Frozen Stop Stop Run Run Run Run On
Page 134 and 135: Figure 45 Raw acquisition mode API
Page 136 and 137: Figure 46 GNU Example project usage
Page 138 and 139: the QTouch Library as QMatrix data
Page 140 and 141: TOUCH_STATUS_CHANGE 0x0002u Status
Page 142 and 143: sensor_type_tEnumerationUsesensor_t
Page 144 and 145: OUT_OF_TOUCHIN_TOUCHCurrently the a
Page 146 and 147: num_channel_signals uint8_t Length
Page 148 and 149: touch_at_statusstructureInput / Out
Page 150 and 151: UseData structure which holds the R
Page 152 and 153: variable to the Touch library. The
Page 154 and 155: structure.p_qta_config touch_qt_con
Page 156 and 157: p_touch_sensor_param touch_qm_param
Page 158 and 159: current_time_ms touch_time_t Curren
Page 160 and 161: touch_ret_t touch_qt_sensor_config(
Page 162 and 163: touch_qt_sensors_calibratetouch_ret
Page 164 and 165: touch_qt_get_libinfotouch_ret_t tou
Page 166 and 167: • This API updates the configurat
Page 168 and 169: Rule Rule Description Advisory/Requ
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VCCPA0No ConnectionPA1PA2ATtiny20PA
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QTouch Library configuration parame
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Recommended setting.Table 19 QTouch
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Figure 51 Schematic overview of QTo
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QTouch Library configuration parame
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Devices supportedThe list of differ
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• The channel number is derived f
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MISRA Compliance ReportThis section
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May 2010Ver 4.2July 2010Ver 4.3Jan
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