PIC16LF1946_13 Datasheet, PDF (327/478 Pages) Microchip Technology – 64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology

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
CPS0
CPS1
CPS2
CPS3
CPS4
CPS5
CPS6
CPS7
CPS8
CPS9
CPS10
CPS11
CPS12
CPS13
CPS14
CPS15
CPS16
CPSCH<3:0>
CPSON⁽¹⁾
T0XCS
T0CKI
0
1
CPSRNG<1:0>
CPSON
FOSC/4
Timer0 Module
TMR0CS
Set
TMR0IF
0
TMR0
Overflow
1
Capacitive
Sensing
Oscillator
CPSOSC
0
Int.
Ref-
Ref.
1
DAC
Output
0
Ref+
1 FVR
CPSCLK
CPSOUT
CPSRM
TMR1CS<1:0>
FOSC
FOSC/4
T1OSC/
T1CKI
T1GSEL<1:0>
T1G
sync_C1OUT
sync_C2OUT
Timer1 Module
TMR1H:TMR1L
EN
Timer1 Gate
Control Logic
Note 1: If CPSON = 0, disabling capacitive sensing, no channel is selected.
 2010-2012 Microchip Technology Inc.
DS41414D-page 327