PIC16 datasheet(135/418 Pages) MICROCHIP

135 / 418 page

 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

VRPOS

VRNEG

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

ADFM

Internal

Channel

Inputs

AN0

ANa

ANz

set bit ADIF

VSS

ADON

sampled

input

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

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