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| PIC16LF1824T39A_12 Datasheet, PDF (311/418 Pages) Microchip Technology – 20-Pin Flash Microcontrollers with XLP Technology | |||
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PIC16LF1824T39A
27.0 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
capacitive sensing 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 current ranges
⢠Multiple voltage reference modes
⢠Multiple timer resources
⢠Software control
⢠Operation during Sleep
FIGURE 27-1:
CAPACITIVE SENSING BLOCK DIAGRAM
CPS0
CPS1
CPS2
CPS3
CPS4
CPS5
CPS6
CPS7
T0XCS
T0CKI
0
CPSCH<3:0>
1
CPSON(2)
CPSRNG<1:0>
CPSON
FOSC/4
Timer0 Module
TMR0CS
0
TMR0
Overflow
1
Set
TMR0IF
Capacitive
Sensing
Oscillator
CPSOSC
0
Int.
Ref-
Ref.
1 DAC
Output 0
Ref+
1 FVR
CPSRM
CPSCLK
CPSOUT
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: If CPSON = 0, disabling capacitive sensing, no channel is selected.
ï£ 2012 Microchip Technology Inc.
Preliminary
DS41657A-page 311
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