PIC12F1822-ISLASHMF datasheet(307/398 Pages) MICROCHIP

307 / 398 page

 2010 Microchip Technology Inc.

Preliminary

DS41413A-page 307

PIC12F/LF1822/16F/LF1823

26.0 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 Power modes

• High power range with variable voltage references

• Multiple timer resources

• Software control

• Operation during Sleep

FIGURE 26-1:

CAPACITIVE SENSING BLOCK DIAGRAM

Note 1:

Reference CPSCON1 register (Register 26-2) for channels implemented on each device.

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

TMR0CS

CPS0

CPS1

CPS2

CPS3

CPS4(1)

CPS5(1)

CPS6(1)

CPSCH<3:0>

Capacitive

Sensing

Oscillator

CPSOSC

CPSON

CPSRNG<1:0>

TMR0

Set

TMR0IF

Overflow

T0XCS

T0CKI

CPSOUT

CPS7(1)

CPSCLK

FOSC/4

Timer0 Module

CPSON(2)

T1CS<1:0>

T1OSC/

T1CKI

TMR1H:TMR1L

T1GSEL<1:0>

Timer1 Gate

Control Logic

T1G

FOSC

FOSC/4

Timer1 Module

SYNCC1OUT

SYNCC2OUT

Int.

Ref.

FVR

DAC

Ref+

Ref-

CPSRM

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