PIC16F1936T-I/PT View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F1936T-I/PT

28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP™ Technology

Microchip Technology 

PIC16F193X/LF193X

18.0 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 18-1:

CAPACITIVE SENSING BLOCK DIAGRAM

CPS0

CPS1

CPS2

CPS3

CPS4

CPS5

CPS6

CPS7

CPS8(1)

CPS9(1)

CPS10(1)

CPS11(1)

CPS12(1)

CPS13(1)

CPS14(1)

CPS15(1)

CPS16(1)

CPSCH<3:0>(2)

CPSON(3)

T0XCS

T0CKI

0

1

FOSC/4

Timer0 Module

TMR0CS

0

TMR0

Overflow

1

Set

TMR0IF

CPSON

Capacitive

Sensing

Oscillator

CPSOSC

CPSCLK

CPSOUT

CPSRNG<1:0>

T1CS<1:0>

FOSC

FOSC/4

T1OSC/

T1CKI

T1GSEL<1:0>

T1G

SYNCC1OUT

SYNCC2OUT

Timer1 Module

TMR1H:TMR1L

EN

Timer1 Gate

Control Logic

Note 1: Reference Register 18-2 for channels implemented on each device

2: CPSCH3 is not implemented on PIC16F1933/1936/1938/PIC16LF1933/1936/1938.

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

© 2009 Microchip Technology Inc.

Preliminary

DS41364B-page 177

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