Capacitive mtouch Sensing Solutions
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1 Capacitive mtouch Sensing Solutions Design Guidelines 2010 Microchip Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 1
2 Agenda Design Guidelines for: Copper Pad Size Circuit Traces Ground Plane Other Considerations LED Back-Lighting Effect Robust Design Conclusion Appendix Test Board Spec Test Condition Breakdown Voltage of panels materials 2010 Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 2
3 Design Guidelines for : Copper Pad Size 2010 Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 3
4 Capacitance A C ε = 0 ε r A d d ε0 εr A C d Permittivity of Free Space (8.854 Pico-Farad/meter) Relative Dielectric Constant (unit-less) Area of Plates (meters) Capacitance (Farads) Distance between plates (meters) 2010 Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 4
5 Pad Shape and Size C = ε 0 ε A r d d A Pad Area Sensing Area Increase Sensitivity 2010 Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 5
6 Pad Shape and Size C = ε 0 ε A r d d A ½ x ½ (12.7mm x 12.7mm) 2010 Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 6
7 Pad Shape and Size 1 < Top > < Bottom > 20mm Touch Pad PIC16F726 Idle Touch % <1> <2> <3> <4> <5> Idle Touch % 2 15mm Touch Pad PIC16F690 Idle Touch % Idle Touch % 3 10mm <1> <2> <3> <4> <5> mm 5mm Touch Pad PIC10F206 Idle Touch % Idle Touch % <1> <2> <3> <4> <5> Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 7
8 Design Guidelines for : Circuit Traces 2010 Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 8
9 Pads and Traces PICmicro MCU CVREF 2/3 VDD + _ C1 S Q Covering Plate 1/4VDD + _ C2 R Q sensor sensor 2 Via PCB Trace connects sensor to PIC MCU pin Sensing Trace as far away from other signals trace as possible (Do not route traces under any Sensor) 120KΩ C P1 120KΩ C P Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 9
10 Other Trace Considerations Traces connected to Sensor pad Same Length (as short as possible) Same Thickness (as thin as possible) Parasitic capacitance sensor 1 sensor 2 sensor 3 Bottom View 2010 Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 10
11 Design Guidelines for : Ground Plane 2010 Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 11
12 Ground Plane Ground Plane for Sensor Pad - Sensor Pad Closed to Ground Plane, Capacitance Cp Increase (Sensor Sensitivity decrease) - Ground plane is needed for reducing the SNR (signal to Noise Ratio) - Open Mesh Ground to Minimize Parasitic Capacitance - Recommended Gap is 2~4 mm. Top Side Bottom Side Ground Plane for Traces - Traces Close to Ground Plane, Capacitance Cp Increase (Sensor Sensitivity decrease) - Ground plane is needed for reducing the SNR (signal to Noise Ratio) Sensor Pad Gap Ground Plane 2010 Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 12
13 Design Guidelines for : Covering Plate 2010 Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 13
14 Covering Plate Thickness Thinner covering plates increase sensitivity and accuracy C = ε 0 ε A r d CF CF 2010 Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 14
15 Dielectric Constant (εr) Material Air FR-4 Teflon Rubber Plexiglass Paper Glass Acryl Ceramic Vaseline Amber(fossil reson) ABS water Dielectric Constant(εr) ~ ~ ~ ~ Covering Plate PCB C = Copper Pad ε 0 ε A r d Cover plate thickness and Its Dielectric Constant Play a large Part In Sensor Sensitivity. If you want to get high sensitivity, Cover plate s Material has a High Dielectric Constant Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 15
16 Design Guidelines for : Other Considerations 2010 Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 16
17 LED Backlighting Issue Cover Plate PCB Touch Pad LED Touch Pad At nearby led a touch pad was cause led cross capacitance. It make the touch sensor less sensitive. To compensate a Led Cross Capacitance, Attached a 10nF Capacitor to transistor s Collector Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 17
18 Robust Design: CSM Product PIC16F726 CAPOSC Module (Oscillator) Frequency Capture TMR1 CS TMR0 Resistor Value (ohm) PIC16F726 Idle Touch % K K K K K K 5.1K 11K 56K 100K Idle Touch % 2010 Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 18
19 Robust Design : SR-Latch CVREF 2/3 VDD PIC16F690 1µF 300KΩ VDD 1/4VDD 100KΩ + _ + _ C1 C2 S R Q Q C2OUT pin TIMER0 TIMER1 T0CKI pin CS Resistor Value (ohm) PIC16F690 Idle Touch % K K K K K K 5.1K 11K 56K 100K Idle Touch % 2010 Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 19
20 Robust Design : Simple Comparator Product PIC10F206 + C1 _ MMBD4148SE Band Gap(0.6V) CS 220K TMR0 Resistor Value (ohm) PIC10F206 Idle Touch % K K K Idle Touch % 56K K K 5.1K 11K 56K 100K Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 20
21 Conclusion Design Considerations: Copper Pad Size Circuit Traces Ground Plane Covering Plate Other Considerations d LED Backlighting Issue Robust Design A C = ε 0 ε A r d 2010 Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 21
22 Appendix Test Board Spec & Test Condition 2010 Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 22
23 MCU Board Picture PIC16F726 Various Resistor PIC12F629 PIC16F690 Programmer Connector Push Button LEDs PIC10F206 Touch Ports Connector PIC24FJ128GA106 USB Jack PIC16F727 9V Adaptor Jack PICKIT Serial Connector Buzzer MCP1790 Jumper ( 5V or 3.3V ) MCP Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 23
24 Touch Board Picture < Top > < Bottom > 4 Zone Slide Pad Touch Pad Connector 2 Zone Slide Pad Touch Pad Connector 4X4 Matrix Pad Cap & Resistor Space for ESD/EMI Same Size(10mm), Different Pattern Same Pattern, Different Size 2010 Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 24
25 Test Condition Touch Pad Condition - Cover Material : Plastic - Cover Thickness : 3mm MCU Condition 1. PIC16F726( CSM Family ) - System Voltage : 5V - System Clock : Internal 4Mhz - Cap Button Scan Rate : 2.16mSec - CSM OSC Range Current : 18uA 2. PIC16F690( SR-Latch Family ) - System Voltage : 5V - System Clock : Internal 4Mhz - Cap Button Scan Rate : 2.16mSec 3. PIC10F206( Simple Comparator Family ) - System Voltage : 5V - System Clock : Internal 4Mhz - Cap Button Scan Rate : 10mSec 2010 Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 25
26 Breakdown Voltage of Panel s Materials Material Air Glass-Common Glass-Borosilicate Formica ABS Acrylic Polycarbonate FR-4 Nylon Lexan Breakdown Voltage [V/mm] 1200~ ,000 18,000 16,000 13,000 16,000 27,000 16,000 15, Microchip Technology Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 26
27 Thank You!! 2010 Microchip Korea AE Team. All Rights Reserved. Capacitive Touch Sensing Design Guide Slide 27
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