Datasheet

Table Of Contents
2011-2013 Microchip Technology Inc. DS40001609C-page 135
PIC16(L)F1508/9
15.0 ANALOG-TO-DIGITAL
CONVERTER (ADC) MODULE
The Analog-to-Digital Converter (ADC) allows
conversion of an analog input signal to a 10-bit binary
representation of that signal. This device uses analog
inputs, which are multiplexed into a single sample and
hold circuit. The output of the sample and hold is
connected to the input of the converter. The converter
generates a 10-bit binary result via successive
approximation and stores the conversion result into the
ADC result registers (ADRESH:ADRESL register pair).
Figure 15-1 shows the block diagram of the ADC.
The ADC voltage reference is software selectable to be
either internally generated or externally supplied.
The ADC can generate an interrupt upon completion of
a conversion. This interrupt can be used to wake-up the
device from Sleep.
FIGURE 15-1: ADC BLOCK DIAGRAM
VRPOSVRNEG
Enable
DACx_output
FVR_buffer1
Temp Indicator
CHS<4:0>
External
Channel
Inputs
GO/DONE
complete
start
ADC
Sample Circuit
Write to bit
GO/DONE
VSS
VDD
VREF+ pin
VDD
ADPREF
10-bit Result
ADRESH ADRESL
16
ADFM
10
Internal
Channel
Inputs
.
.
.
AN0
ANa
ANz
set bit ADIF
VSS
ADON
sampled
input
Q1
Q2
Q4
Fosc
Divider
FOSC
FOSC/n
FRC
ADC
Clock
Select
ADC_clk
ADCS<2:0>
FRC
ADC CLOCK SOURCE
Trigger Select
Trigger Sources
...
TRIGSEL<3:0>
AUTO CONVERSION
TRIGGER
Positive
Reference
Select
Rev. 10-000033A
7/30/2013