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41594B Datasheet(PDF) 291 Page - Microchip Technology

Part # 41594B
Description  8-Bit Flash Microcontroller with nanoWatt XLP Technology
PDF  372 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

41594B Datasheet(HTML) 291 Page - Microchip Technology

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 2011-2012 Microchip Technology Inc.
Preliminary
DS41594B-page 291
PIC12LF1840T48A
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 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
• High power range with variable voltage references
• Multiple timer resources
• Software control
• Operation during Sleep
FIGURE 27-1:
CAPACITIVE SENSING BLOCK DIAGRAM
Note
1:
If CPSON = 0, disabling capacitive sensing, no channel is selected.
TMR0CS
CPS0
CPS1
CPS2
CPS3
CPSCH<3:0>
Capacitive
Sensing
Oscillator
CPSOSC
CPSON
CPSRNG<1:0>
TMR0
0
1
Set
TMR0IF
Overflow
T0XCS
0
1
T0CKI
CPSOUT
CPSCLK
FOSC/4
Timer0 Module
CPSON(1)
T1CS<1:0>
T1OSC/
T1CKI
TMR1H:TMR1L
EN
T1GSEL<1:0>
Timer1 Gate
Control Logic
T1G
FOSC
FOSC/4
Timer1 Module
SYNCC1OUT
0
1
Int.
Ref.
FVR
DAC
Ref+
Ref-
CPSRM
0
1



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