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| PIC16F1938_13 Datasheet, PDF (315/488 Pages) Microchip Technology – 28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver | |||
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PIC16(L)F1938/9
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 Current Ranges
⢠Multiple Voltage Reference modes
⢠Multiple timer resources
⢠Software control
⢠Operation during Sleep
FIGURE 26-1:
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)
CPSCH<3:0>
CPSON(2)
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
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
CPSRM
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.
ï£ 2011-2013 Microchip Technology Inc.
DS40001574C-page 315
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