PIC18LF24K Datasheet, PDF (435/594 Pages) –

PIC18(L)F26/45/46K40
31.4 Capacitive Voltage Divider (CVD)
Features
The ADC module contains several features that allow
the user to perform a relative capacitance
measurement on any ADC channel using the internal
ADC sample and hold capacitance as a reference. This
relative capacitance measurement can be used to
implement capacitive touch or proximity sensing
applications. Figure 31-6 shows the basic block
diagram of the CVD portion of the ADC module.
FIGURE 31-6:
HARDWARE CAPACITIVE VOLTAGE DIVIDER BLOCK DIAGRAM
ADOUT Pad
ADOUT
ADOEN
VDD
ANx
ANx Pads
ADIPPOL = 1
ADC Conversion Bus
ADIPPOL = 0
VGND
Additional
Sample and
Hold Cap
VGND
VGND
VGND
ADDCAP<2:0>
 2016 Microchip Technology Inc.
Preliminary
DS40001816C-page 435