Freescale Semiconductor Evaluation Board MPR031/2 for 2- or 3-pad touch sensor controllers DEMOMPR031 User Manuals

Table of Contents

• 1 Device Overview

  2
  • 1.1 Introduction

    2
  • 1.2 Internal Block Diagram

    2
• 2 External Signal Description

  3
  • 2.1 Device Pin Assignment

    3
    • Table 1. Device Pin Assignment

      3
  • 2.2 Recommended System Connections

    3
  • 2.3 Serial Interface

    4
    • 2.3.1 Serial-Addressing

      4
    • 2.3.2 Start and Stop Conditions

      4
    • 2.3.3 Bit Transfer

      5
    • 2.3.4 Acknowledge

      5
    • 2.3.5 The Slave Address

      5
    • Table 2.

      5
    • 2.3.6 Message Format for Writing the MPR03X

      6
    • 2.3.7 Message Format for Reading the MPR03X

      6
    • 2.3.8 Operation with Multiple Master

      7
  • 2.4 Register Address Map

    7
    • Table 3. Register Address Map

      7
• 3 Functional Overview

  8
  • 3.1 Introduction

    8
  • 3.2 Understanding the Basics

    8
  • 3.3 Implementation

    8
• 4 Modes of Operation

  9
  • 4.1 Introduction

    9
  • 4.2 Stop Mode

    9
    • 4.2.1 Initial Power Up

      9
    • Table 4. Power-Up Register Configurations

      9
    • 4.2.2 Stop Mode Usage

      9
  • 4.3 Run1 Mode

    10
  • 4.4 Run2 Mode

    10
  • 4.5 Electrode Configuration Register

    10
    • Table 5. Electrode Configuration Register Field Descriptions

      11
• 5 Output Mechanisms

  12
  • 5.1 Introduction

    12
  • 5.2 Touch Status

    12
    • 5.2.1 Touch Status Register

      12
    • Table 6. Touch Pad Status Register Field Descriptions

      12
  • 5.3 Filtered Data

    13
    • 5.3.1 Filtered Data Low Register

      13
    • Table 7. Filtered Data Low Register Field Descriptions

      13
    • 5.3.2 Filtered Data High Register

      13
    • Table 8. Filtered Data High Register Field Descriptions

      13
  • 5.4 Baseline Values

    14
    • 5.4.1 Baseline Value Register

      14
    • Table 9. Filtered Data High Register Field Descriptions

      14
• 6 Interrupts

  15
  • 6.1 Introduction

    15
  • 6.2 Triggering an Interrupt

    15
  • 6.3 Interrupt Handling

    15
  • 6.4 IRQ Pin

    15
• 7 Theory of Operation

  16
  • 7.1 Introduction

    16
  • 7.2 Capacitance Measurement

    16
    • Table 10.

      17
  • 7.3 Sensitivity

    17
    • Table 11.

      18
  • 7.4 Configuration

    19
    • 7.4.1 AFE Configuration Register

      19
    • Table 12. AFE Configuration Register Field Descriptions

      19
• 8 Filtering

  20
  • 8.1 Introduction

    20
  • 8.2 First Level

    20
  • 8.3 Second Level

    20
    • 8.3.1 Filter Configuration Register

      20
    • Table 13. Filter Configuration Register Field Descriptions

      21
  • 8.4 Third Level Filter

    21
    • 8.4.1 Max Half Delta Register

      21
    • Table 14. Max Half Delta Register Field Descriptions

      21
    • 8.4.2 Noise Half Delta Register

      22
    • Table 15. Noise Half Delta Register Field Descriptions

      22
    • 8.4.3 Noise Count Limit Register

      22
    • Table 16. Noise Count Limit Register Field Descriptions

      22
• 9 Touch Detection

  23
  • 9.1 Introduction

    23
  • 9.2 Thresholds

    23
    • 9.2.1 Touch Threshold Register

      23
    • Table 17. Touch Threshold Register Field Descriptions

      23
    • 9.2.2 Release Threshold Register

      23
    • Table 18. Release Threshold Register Field Descriptions

      23
• Appendix A Electrical Characteristics

  24
  • A.1 Introduction

    24
  • A.2 Absolute Maximum Ratings

    24
    • Table 19. Absolute Maximum Ratings - Voltage (with respect to VSS)

      24
  • A.3 ESD and Latch-up Protection Characteristics

    24
    • Table 20. ESD and Latch-up Test Conditions

      24
  • A.4 DC Characteristics

    25
    • Table 21. DC Characteristics (Temperature Range = -40C to 85C Ambient)

      25
  • A.5 AC Characteristics

    25
  • A.6 I2C AC Characteristics

    26
    • Table 22. I2C AC Characteristics

      26
• Appendix B Brief Register Descriptions

  27
• Appendix C Ordering Information

  28
  • C.1 Ordering Information

    28
  • C.2 Device Numbering Scheme

    28