TWR-K60N512-KEIL Freescale Semiconductor, TWR-K60N512-KEIL Datasheet - Page 157

• Manufacturer Part Number: TWR-K60N512-KEIL
• Description: K60N512 Keil Tower Kit
• Manufacturer: Freescale Semiconductor
• Series: Kinetisr
• Type: MCUr

Specifications of TWR-K60N512-KEIL

• Rohs Compliant: YES
• Contents: 4 Boards, Documentation, DVD
• Peak Reflow Compatible (260 C): Yes
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: Freescale Tower System, K60N512

Chapter 17
Touch Sense Input (TSI) Module
17.1 Overview
The Touch Sensing Input (TSI) module is designed to interface the MCU with capacitive
touch sensing electrodes to easily implement advanced user input controls. The TSI
module includes hardware that is able to drive touch sensing electrodes (or capacitors,
created by flat conductive areas) providing robustness above traditional GPIO-based RC
measurements and logic that automatically scans up to 16 electrodes, measures and
outputs the results, and generates interrupt signals to the CPU.
17.2 Introduction
Capacitive touch sensing has become one of the de-facto input technologies for user input
in Human-Machine Interfaces (HMI). It now has a place in all types of markets, from
industrial control panels to portable consumer devices. Though capacitive touch sensing
is not the only touch sensing method, it is one of the most common and most practical to
implement.
The basic element in capacitive touch sensing is the electrode. In this case, the electrode
is a an area of conductive material with dielectric material on the top, usually plastic or
glass. This is what the user touches. This conductive area plus the dielectric material
effectively creates a capacitor referenced to the system ground. By touching the dielectric
on top of the electrode, the user effectively changes the electrode capacitance both by
adding a second conductive area that is grounded (the conductive part of the finger) and
by increasing the dielectric of the original capacitor. The sensor (in this case, the TSI
module) uses a capacitive sensing method to measure changes in the electrode
capacitance.
Kinetis Quick Reference User Guide, Rev. 0, 11/2010
Freescale Semiconductor
157