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Getting Started with CapSense
®
Document No. 001-64846 Rev. *I 63
6. CapSense Migration Paths
As a system evolves, it may require a CapSense controller with more advanced features. The following sections
describe possible migrations among CapSense controllers.
6.1 CY8C20x34 to CY8C20xx6A/H/AS
CY8C20xx6A/H/AS devices implement CSA_EMC using dedicated hardware similar to that in CY8C20x34.
Therefore, upgrading your design from CY8C20x34 to CY8C20xx6A/AS does not require any external hardware or
firmware changes, simply clone your PSoC Designer project to CY8C20xx6A/AS.
Advantages of CY8C20xx6A/H/AS over CY8C20x34:
More I/O pins
Wider operating voltage range
Lower power consumption
Immersion TS2000 Haptics Technology for ERM control
6.2 CY8C21x34/B / CY8C24x94 to CY8C20xx6A/H/AS
All three devices feature CSD capacitive sensing. CY8C20xx6A/H/AS devices implement CSD using dedicated
hardware as opposed to programmable digital and analog blocks as in CY8C21x34/B and CY8C24x94 devices.
Furthermore, CY8C21x34/B and CY8C24x94 devices use an external bleed resistor in the current measuring circuit,
whereas CY8C20xx6A/H/AS devices use an on-chip iDAC. These architectural differences necessitate different
external circuitry, user module parameters, and settings for similarly named parameters and APIs between the
devices.
Advantages of CY8C20xx6A/H/AS over CY8C21x34/B and CY8C24x94:
Eliminates an external hardware component
Wider operating voltage range
Lower power consumption
Immersion TS2000 Haptics Technology for ERM control
6.3 CY8C20xx6A/H/AS to CY8C21x34/B / CY8C24x94
All three devices feature CSD capacitive sensing. CY8C20xx6A/H/AS devices implement CSD using dedicated
hardware as opposed to programmable digital and analog blocks as in CY8C21x34/B and CY8C24x94 devices.
Furthermore, CY8C21x34/B and CY8C24x94 devices use an external bleed resistor in the current measuring circuit,
whereas CY8C20xx6A/H/AS devices use an on-chip iDAC. These architectural differences necessitate different
external circuitry, user module parameters, and settings for similarly named parameters and APIs between the two
devices. If the USB module is used in CY8C20xx6A, then migration is not possible to CY8C21x34/B.
Advantages of CY8C21x34/B and CY8C24x94 over CY8C20xx6A/H/AS:
Proximity up to 5 cm
Water tolerance
- Getting Started with CapSense 1
- Contents 3
- 1. Introduction 6
- 1.4 Document Conventions 9
- 2. CapSense Technology 10
- 2.1.2 Mutual-Capacitance 11
- 2.3.1 Sensing Methods 12
- CY8C21x34/B 13
- = External Connection 14
- 2.4 CapSense Tuning 15
- 2.4.3 Measuring SNR 16
- 2.4.4.1 What is SmartSense? 17
- 2.5 Sensor Types 19
- 2.5.1.2 Matrix Buttons 20
- 2.5.2.1 Linear Sliders 20
- 2.5.2.2 Diplexed Sliders 21
- Area contacted by finger 22
- Proximity Sensor 22
- 2.6 Sensor Construction 23
- 2.7.1 Visual Feedback 24
- OFFON OFF 26
- 2.7.2 Haptic Feedback 28
- 2.7.3 Audible Feedback 29
- 2.8 Water Tolerance 31
- CapSense Controller 32
- 3. Design Considerations 33
- 3.2 ESD Protection 34
- Non Conductive 35
- Material 35
- 3.2.2 Redirect 36
- 3.2.3 Clamp 36
- 3.3.1.1 Ground Plane 37
- 3.3.1.2 Series Resistor 37
- 3.3.1.3 Trace Length 37
- 3.3.1.4 Current Loop Area 37
- CapSense 38
- Controller 38
- 3.3.2 Radiated Emissions 39
- 3.4 Software Filtering 41
- 3.4.2 IIR Filter 42
- Equation 18 43
- 3.4.3 Median Filter 44
- 3.4.4 Jitter Filter 45
- Unfiltered 46
- Filtered 46
- 3.5 Power Consumption 47
- 3.6 Pin Assignments 48
- 3.7 PCB Layout Guidelines 51
- 3.7.5 Slider Design 52
- 3.7.8 Trace Routing 53
- 3.7.9 Crosstalk Solutions 53
- 3.7.10 Vias 54
- 3.7.11 Ground Plane 54
- Sensor-1 55
- Shield Electrode 56
- Guard Sensor 56
- Sensor Pads 56
- 4.1.1.1 CY8CMBR20xx 57
- 4.1.1.2 CY8C201xx 57
- 4.1.2.1 CY8C20x34, CapSense 57
- 5. CapSense Selector Guide 59
- Design Requirements 60
- 7. Resources 65
- 7.4.5 Evaluation Pods 66
- 7.5 Demonstration Kit 67
- 7.6 PSoC Designer 67
- 7.7 PSoC Programmer 68
- C-to-USB Bridge Kit 69
- 7.10 Design Support 71
- 8. Appendix 72
- Introduced Capacitance, pF 73
- 8.1.4 Design Examples 74
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