PIC24F04KA201 datasheet(145/224 Pages) MICROCHIP

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Preliminary

DS39937B-page 143

PIC24F04KA201 FAMILY

19.0

10-BIT HIGH-SPEED A/D

CONVERTER

The 10-bit A/D Converter has the following key

features:

• Successive Approximation (SAR) conversion

• Conversion speeds of up to 500 ksps

• 9 analog input pins

• External voltage reference input pins

• Internal band gap reference inputs

• Automatic Channel Scan mode

• Selectable conversion trigger source

• 16-word conversion result buffer

• Selectable Buffer Fill modes

• Four result alignment options

• Operation during CPU Sleep and Idle modes

On all PIC24F04KA201 family devices, the 10-bit A/D

Converter has nine analog input pins, designated AN0

through AN5 and AN10 through AN12. In addition,

there are two analog input pins for external voltage

reference connections (VREF+ and VREF-). These

voltage reference inputs may be shared with other

analog input pins.

A block diagram of the A/D Converter is displayed in

Figure 19-1.

To perform an A/D conversion:

Configure the A/D module:

a) Configure port pins as analog inputs and/or

select

band

gap

reference

inputs

(AD1PCFG<15:13>, AD1PCFG<9:6>).

b) Select voltage reference source to match

expected

range

analog

inputs

(AD1CON2<15:13>).

Select the analog conversion clock to match

the desired data rate with the processor

clock (AD1CON3<7:0>).

d) Select the appropriate sample/conversion

sequence

(AD1CON1<7:5>

and

AD1CON3<12:8>).

e) Select

how

conversion

results

are

presented in the buffer (AD1CON1<9:8>).

Select interrupt rate (AD1CON2<5:2>).

g) Turn on A/D module (AD1CON1<15>).

Configure A/D interrupt (if required):

a) Clear the AD1IF bit.

b) Select A/D interrupt priority.

Note:

This data sheet summarizes the features

of this group of PIC24F devices. It is not

intended to be a comprehensive reference

source. For more information on the 10-Bit

High-Speed A/D Converter, refer to the

“PIC24F

Family

Reference

Manual”

Section 17. “10-Bit A/D Converter”

(DS39705).

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