16F1829 datasheet(152/420 Pages) MICROCHIP

152 / 420 page

PIC16F/LF1825/1829

DS41440A-page 152

Preliminary

 2010 Microchip Technology Inc.

16.1

ADC Configuration

When configuring and using the ADC the following

functions must be considered:

• Port configuration

• Channel selection

• ADC voltage reference selection

• ADC conversion clock source

• Interrupt control

• Result formatting

16.1.1

PORT CONFIGURATION

The ADC can be used to convert both analog and

digital signals. When converting analog signals, the I/O

pin should be configured for analog by setting the

associated

TRIS

and

ANSEL

bits.

Refer

Section 12.0 “I/O Ports” for more information.

16.1.2

CHANNEL SELECTION

There are up to 15 channel selections available:

• AN<7:0> pins (PIC16F/LF1825 only)

• AN<11:0> pins (PIC16F/LF1829 only)

• Temperature Indicator

• DAC Output

• FVR (Fixed Voltage Reference) Output

Refer to Section 17.0 “Digital-to-Analog Converter

(DAC) Module”, Section 14.0 “Fixed Voltage Refer-

ence (FVR)” and Section 15.0 “Temperature Indicator

Module” for more information on these channel selec-

tions.

The CHS bits of the ADCON0 register determine which

channel is connected to the sample and hold circuit.

When changing channels, a delay is required before

starting the next conversion. Refer to Section 16.2

“ADC Operation” for more information.

16.1.3

ADC VOLTAGE REFERENCE

The ADPREF bits of the ADCON1 register provides

control of the positive voltage reference. The positive

voltage reference can be:

•VREF+ pin

•VDD

• FVR 2.048V

• FVR 4.096V (Not available on LF devices)

The ADNREF bits of the ADCON1 register provides

control of the negative voltage reference. The negative

voltage reference can be:

•VREF- pin

•VSS

See Section 14.0 “Fixed Voltage Reference (FVR)”

for more details on the fixed voltage reference.

Note:

Analog voltages on any pin that is defined

as a digital input may cause the input buf-

fer to conduct excess current.

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