INTEDG datasheet(327/478 Pages) MICROCHIP

327 / 478 page

 2010-2012 Microchip Technology Inc.

DS41414D-page 327

PIC16(L)F1946/47

26.0 CAPACITIVE SENSING (CPS)

MODULE

The Capacitive Sensing (CPS) module allows for an

interaction with an end user without a mechanical

interface. In a typical application, the CPS 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

CPS module. The CPS 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 power modes

• Multiple current ranges

• Multiple voltage reference modes

• Software control

• Operation during Sleep

FIGURE 26-1:

CAPACITIVE SENSING BLOCK DIAGRAM

Note 1:

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

TMR0CS

CPS0

CPS1

CPS2

CPS3

CPS4

CPS5

CPS6

CPS7

CPS8

CPS9

CPS10

CPSCH<3:0>

Capacitive

Sensing

Oscillator

CPSOSC

CPSON

CPSRNG<1:0>

TMR0

Set

TMR0IF

Overflow

T0XCS

T0CKI

CPS11

CPS12

CPS13

CPS14

CPS15

CPSCLK

FOSC/4

Timer0 Module

CPSON(1)

TMR1CS<1:0>

T1OSC/

T1CKI

TMR1H:TMR1L

T1GSEL<1:0>

Timer1 Gate

Control Logic

T1G

FOSC

FOSC/4

Timer1 Module

sync_C1OUT

sync_C2OUT

Int.

Ref.

FVR

DAC

Ref+

Ref-

CPSRM

CPS16

CPSOUT

Output

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