PIC10LF322T-EMCSQTP datasheet(92/210 Pages) MICROCHIP

92 / 210 page

PIC10(L)F320/322

DS41585A-page 92

Preliminary

 2011 Microchip Technology Inc.

15.1

ADC Configuration

When configuring and using the ADC the following

functions must be considered:

• Port configuration

• Channel selection

• ADC conversion clock source

• Interrupt control

15.1.1

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 10.0 “I/O Port”

for more information.

15.1.2

CHANNEL SELECTION

There are up to 5 channel selections available:

• AN<2:0> pins

• Temperature Indicator

• FVR (Fixed Voltage Reference) Output

Refer to Section 12.0 “Fixed Voltage Reference

(FVR)”

and Section 14.0 “Temperature Indicator

Module”

for more information on these channel selec-

tions.

The CHS bits of the ADCON 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 15.2

“ADC Operation”

for more information.

15.1.3

ADC VOLTAGE REFERENCE

There is no external voltage reference connections to

the ADC. Only VDD can be used as a reference source.

The FVR is only available as an input channel and not

a VREF+ input to the ADC.

15.1.4

CONVERSION CLOCK

The source of the conversion clock is software select-

able via the ADCS bits of the ADCON register

(Register 15-1). There are seven possible clock

options:

•FOSC/2

•FOSC/4

•FOSC/8

•FOSC/16

•FOSC/32

•FOSC/64

•FRC (dedicated internal oscillator)

The time to complete one bit conversion is defined as

TAD. One full 8-bit conversion requires 9.5 TAD periods

as shown in Figure 15-2.

For correct conversion, the appropriate TAD specifica-

tion must be met. Refer to the A/D conversion require-

ments in Section 24.0 “Electrical Specifications” for

more information. Table 15-1 gives examples of appro-

priate ADC clock selections.

Note:

Analog voltages on any pin that is defined

as a digital input may cause the input buf-

fer to conduct excess current.

Note 1:

Any changes in the system clock fre-

quency will change the ADC clock fre-

quency, which may adversely affect the

ADC result.

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