K60P100M100SF2RM Datasheet, PDF (1757/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Chapter 55
Touch sense input (TSI)
55.1 Introduction
NOTE
For the chip-specific implementation details of this module's
instances see the chip configuration chapter.
The touch sensing input (TSI) module provides capacitive touch sensing detection with
high sensitivity and enhanced robustness. Each TSI pin implements the capacitive
measurement of an electrode having individual programmable detection thresholds and
result registers. The TSI module can be functional in several low power modes with ultra
low current adder and waking up the CPU in a touch event. It provides a solid capacitive
measurement module for the implementation of touch keypad, rotaries and sliders.
55.2 Features
• Support as many as 16 input capacitive touch sensing pins with individual result
registers
• Automatic detection of electrode capacitance change with programmable upper and
lower threshold
• Automatic periodic scan unit with different duty cycles for run and low power modes
• Full support with FSL touch sensing SW library (TSS) for the implementation of
keypads, rotaries and sliders
• Operation across all low power modes: Wait,Stop, VLPR, VLPW, VLPS,
LLS,VLLS{3,2,1}
• Capability to wake up MCU from low power modes
• Configurable interrupts:
• End-of-scan or out-of-range interrupt
• TSI error interrupts: pad short to V_DD/V_SS or conversion overrun
• Compensate temperature and supply voltage variations
• Stand alone operation not requiring any external crystal even in low power modes
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
1757