User Manuals: Cypress CapSense CY8C21x34/B Controller

Manuals and User Guides for Cypress CapSense CY8C21x34/B Controller. We have 1 Cypress CapSense CY8C21x34/B Controller manual available for free PDF download: Design Manual

Cypress CapSense CY8C21x34/B Design Manual

Cypress CapSense CY8C21x34/B Design Manual (57 pages)

Brand: Cypress | Category: Controller | Size: 1 MB

Table of Contents

Table of Contents
3
1 Introduction

7
2 Capsense Technology

11
- Capsense Fundamentals
  11
- Capsense Methods in Cy8C21X34/B
  13
3 Capsense Design Tools

16
- Overview of Capsense Design Tools
  16
- User Module Overview
  18
- Capsense User Module Global Arrays
  18
  - Raw Count
    19
  - Baseline
    19
  - Difference Count (Signal)
    19
  - Sensor State
    19
- CSD User Module Configurations
  20
  - CSD Without Clock Prescaler
    20
  - CSD with Clock Prescaler
    20
- CSD User Module Parameters
  20
- CSD User Module High-Level Parameters
  21
  - Finger Threshold
    21
  - Noise Threshold
    21
  - Baseline Update Threshold
    21
  - Sensors Autoreset
    21
  - Hysteresis
    21
  - Debounce
    22
  - Negative Noise Threshold
    22
  - Low Baseline Reset
    22
  - High Level Parameter Recommendations
    22
- CSD User Module Low-Level Parameters
  23
  - Scanning Speed
    23
  - Resolution
    23
  - Reference
    24
  - Ref Value
    24
  - Prescaler Period
    24
  - Shield Electrode out
    24
- CSDADC User Module Configurations
  24
- CSDADC User Module Parameters
  25
- Low-Level Parameters
  25
  - Scanning Speed
    25
  - Resolution
    25
  - Reference
    26
  - Ref Value
    26
  - Prescaler Period
    26
  - Shield Electrode out
    26
  - ADC Enabled
    26
- Smartsense User Module Parameters
  27
- Low-Level Parameters
  27
  - Shield Electrode out
    27
  - Modulator Capacitor Pin
    27
  - Feedback Resistor Pin
    27
  - Threshold Setting Mode
    27
  - Sensitivity Level
    27
  - Finger Threshold
    28
4 Capsense Performance Tuning with User Modules

29
5 Design Considerations

37
- Overlay Selection
  37
- ESD Protection
  38
  - Prevent
    38
  - Redirect
    38
  - Clamp
    38
- Electromagnetic Compatibility (EMC) Considerations
  38
  - Radiated Interference
    38
  - Radiated Emissions
    39
  - Conducted Immunity and Emissions
    39
- Software Filtering
  39
- Power Consumption
  40
- Pin Assignments
  42
- PCB Layout Guidelines
  42
6 Water Tolerance

43
- Shield Electrode and Guard Sensor
  43
  - Shield
    43
  - Guard Sensor
    46
- Design Recommendations
  48
7 Proximity Sensing

49
- Types of Proximity Sensors
  49
  - Button
    49
  - Wire
    49
  - PCB Trace
    49
  - Sensor Ganging
    49
- Design Recommendations
  50
8 Low Power Design Considerations

51
- Additional Power Saving Techniques
  51
  - Set Drive Modes to Analog HI-Z
    51
  - Putting It All Together
    52
  - Sleep Mode Complications
    52
  - Pending Interrupts
    52
  - Global Interrupt Enable
    52
- Post Wakeup Execution Sequence
  53
  - PLL Mode Enabled
    53
  - Execution of Global Interrupt Enable
    53
  - I C Slave with Sleep Mode
    53
  - Sleep Timer
    53
9 Resources

55
- In-Circuit Emulation (ICE) Kit
  56
- Design Support
  57

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