Cypress CY8C20xx7/S CapSense Series Manuals

Manuals and User Guides for Cypress CY8C20xx7/S CapSense Series. We have 1 Cypress CY8C20xx7/S CapSense Series manual available for free PDF download: Design Manual

Cypress CY8C20xx7/S CapSense Series Design Manual

Cypress CY8C20xx7/S CapSense Series Design Manual (75 pages)

Brand: Cypress | Category: Controller | Size: 2 MB

Table of Contents

Table of Contents
3
1 Introduction

6
2 Capsense Technology

11
- Capsense Fundamentals
  11
- Capacitive Sensing Methods in Cy8C20Xx7/S
  12
3 Capsense Design Tools

20
- Overview
  20
- User Module Overview
  22
- Capsense User Module Global Arrays
  22
  - Raw Count
    23
  - Baseline
    23
  - Difference Count (Signal)
    23
  - Sensor State
    23
- CSD/CSDPLUS User Module Parameters
  23
  - User Module High-Level Parameters
    24
  - CSD/CSDPLUS User Module Low-Level Parameters
    27
- Smartsense_Emcplus User Module Parameters
  31
4 Capsense Performance Tuning with User Modules

33
- General Considerations
  33
- Tuning the CSD/CSDPLUS User Module
  35
  - IDAC Range
    37
  - Autocalibration
    37
  - IDAC Value
    37
  - Compensation IDAC Value
    37
  - Precharge Source
    37
  - Prescaler
    37
  - Resolution
    38
  - Scanning Speed
    38
  - High-Level API Parameters
    39
  - Set High-Level Parameters
    40
- Using the Smartsense_Emcplus User Module
  40
- Design Migration from Cy8C20Xx6A/As to Cy8C20Xx7/S
  47
5 Design Considerations

48
- Overlay Selection
  48
- ESD Protection
  49
  - Prevent
    49
  - Redirect
    49
  - Clamp
    49
- Electromagnetic Compatibility (EMC) Considerations
  49
  - Radiated Interference
    49
  - Radiated Emissions
    50
  - Conducted Immunity and Emissions
    50
- Software Filtering
  50
- Power Consumption
  51
- Pin Assignments
  52
- GPIO Load Transient
  53
  - Hardware Guidelines to Reduce GPIO Load Transient Noise
    54
  - Firmware Guidelines to Compensate GPIO Load Transient Noise
    55
- PCB Layout Guidelines
  57
6 Liquid-Tolerant Design Considerations

58
- Shield Electrode and Guard Sensor
  58
  - Shield
    58
  - Guard Sensor
    61
- Design Recommendations
  63
7 Proximity Sensing Design Considerations

64
- Types of Proximity Sensors
  64
  - Button
    64
  - Wire
    64
  - PCB Trace
    64
  - Sensor Ganging
    64
- Design Recommendations
  65
8 Low-Power Design Considerations

66
- Additional Power Saving Techniques
  66
- Post Wakeup Execution Sequence
  68
9 Resources

70
- Website
  70
- Datasheet
  70
- Technical Reference Manual
  70
- Development Kits
  71
- Sample Board Files
  72
- Psoc Programmer
  74
- Capsense Data Viewing Tools
  74
- Psoc Designer
  74
- Code Examples
  74
- Design Support
  74
Revision History

75

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