PIC12F1822T-I/SL View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
PIC12F1822T-I/SL Datasheet PDF : 398 Pages
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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
CPS0
CPS1
CPS2
CPS3
CPS4(1)
CPS5(1)
CPS6(1)
CPS7(1)
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
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: Reference CPSCON1 register (Register 26-2) for channels implemented on each device.
2: If CPSON = 0, disabling capacitive sensing, no channel is selected.
2010 Microchip Technology Inc.
Preliminary
DS41413A-page 307
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