PIC16F722A-ESLASHML datasheet(117/284 Pages) MICROCHIP

117 / 284 page

 2010 Microchip Technology Inc.

DS41417A-page 117

PIC16F/LF722A/723A

14.0 CAPACITIVE SENSING

MODULE

The capacitive sensing module allows for an interaction

with an end user without a mechanical interface. In a

typical application, the capacitive sensing module is

attached to a pad on a printed circuit board (PCB), which

is electrically isolated from the end user. When the end

user places their finger over the PCB pad, a capacitive

load is added, causing a frequency shift in the capacitive

sensing module. The capacitive sensing module

requires software and at least one timer resource to

determine the change in frequency. Key features of this

module include:

• Analog MUX for monitoring multiple inputs

• Capacitive sensing oscillator

• Multiple timer resources

• Software control

• Operation during Sleep

FIGURE 14-1:

CAPACITIVE SENSING BLOCK DIAGRAM

T0CS

CPS0

CPS1

CPS2

CPS3

CPS4

CPS5

CPS6

CPS7

CPSCH<2:0>

Capacitive

Sensing

Oscillator

CPSOSC

CPSON

CPSRNG<1:0>

TMR0

Set

T0IF

Overflow

T0XCS

T0CKI

T1CS<1:0>

T1OSC/

T1CKI

TMR1H:TMR1L

T1GSEL<1:0>

Timer1 Gate

Control Logic

T1G

CPSOUT

TMR2

Timer2 Module

Set

TMR2IF

Overflow

Postscaler

CPSCLK

Note 1: If CPSON = 0, disabling capacitive sensing, no channel is selected.

FOSC/4

FOSC

FOSC/4

Timer0 Module

Timer1 Module

CPSON(1)

WDT

Event

Overflow

Watchdog Timer Module

Scaler

PS<2:0>

LP WDT

OSC

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