1 NXP Touch

NXP

Touch software is designed to speed development of your touch

applications and is ideal for use with Kinetis

MCUs. Available in source code,

this software download features touch detection algorithms and be ideally

suited for RTOS-based applications. NXP Touch software employs a modular

architecture with various touch centric controls, modules, and electrode data

objects, enabling integrated and customizable features.

NXP Touch targets to help customers do a smooth migration and easy

designing in touch applications.

It is a total solution for touch control applications, and NXP Touch offers touch

software and hardware touch sensing IP TSI.

SW library in combination with the Kinetis KE1x platform brings lots of

improvements listed below:

• Great EMC performance, noise immunity, pass the IEC61000-4-6

standard test both 3 V/10 V test.

• Support both Self-cap and mutual-cap mode, up to 6x6 matrix touch pads.

• Great performance in liquid tolerance, water, oil, cold steam, and so on.

• High configurable sensitivity, supports up to 10 mm thick glass/plastic overlay.

2 Touch sensing HW support

NXP offers the latest TSI v5 HW peripheral available on Kinetis KE1x devices based on charge-transfer physical principle. This

method provides appropriate performance regarding the sensitivity and immunity against the environmental changes and EMC.

Touch sensing demo SW example is targeted for FRDM-KE15z with inserted FRDM-TOUCH module, which is not included

together with the FRDM board and must be ordered separately.

Contents

1 NXP Touch......................................1

2 Touch sensing HW support.............1

3 NT SW Library.................................2

4 FreeMASTER Run-Time Debugging

Tool................................................. 3

5 Supported compilers....................... 4

6 Software download..........................5

7 Beginning with FRDM board and

Touch Demo....................................8

8 Key detector uSAFA......................31

9 TSI module HW introduction......... 40

10 Shielding principles....................... 53

11 New features supported in NXP

Touch software library...................56

12 Conclusion.....................................59

13 References....................................59

14 Revision history.............................60

AN12709

NXP Touch Development Guide

Rev. 1 — 07 December 2021

Application Note

Figure 1. FRDM-KE15Z and FRDM-TOUCH

3 NT SW Library

NXP offers a touch software library, free of charge. It provides all the software required to detect touches and to implement more

advanced controllers like sliders or keypads.

TSI background algorithms are available for touch keypad and analog decoders, sensitivity auto calibration, low power, proximity,

water tolerance. SW distributed in source code form in “object C language code structure”

NXP Semiconductors

NT SW Library

NXP Touch Development Guide, Rev. 1, 07 December 2021

Application Note 2 / 61