DSPIC33FJ32GP202-ESLASHSP datasheet(169/252 Pages) MICROCHIP

169 / 252 page

Preliminary

DS70290A-page 167

dsPIC33FJ32GP202/204 and dsPIC33FJ16GP304

17.0 10-BIT/12-BIT

ANALOG-TO-DIGITAL

CONVERTER (ADC)

The

dsPIC33FJ32GP202/204

and

dsPIC33FJ16GP304

devices

have

Analog-to-Digital Conversion (ADC) module input

channels.

The AD12B bit (AD1CON1<10>) allows each of the

ADC modules to be configured as either a 10-bit,

4-sample-and-hold ADC (default configuration) or a

12-bit, 1-sample-and-hold ADC.

17.1

Key Features

The 10-bit ADC configuration has the following key

features:

• Successive Approximation (SAR) conversion

• Conversion speeds of up to 1.1 Msps

• Up to 13 analog input pins

• External voltage reference input pins

• Simultaneous sampling of up to four analog input

pins

• Automatic Channel Scan mode

• Selectable conversion trigger source

• Selectable Buffer Fill modes

• Four result alignment options (signed/unsigned,

fractional/integer)

• Operation during CPU Sleep and Idle modes

• 16-word conversion result buffer

The 12-bit ADC configuration supports all the above

features, except:

• In the 12-bit configuration, conversion speeds of

up to 500 ksps are supported

• There is only 1 sample-and-hold amplifier in the

12-bit configuration, so simultaneous sampling of

multiple channels is not supported.

Depending on the particular device pinout, the ADC

can have up to 13 analog input pins, designated AN0

through AN12. In addition, there are two analog input

pins for external voltage reference connections. These

voltage reference inputs can be shared with other

analog input pins.

The actual number of analog input pins and external

voltage reference input configuration will depend on the

specific device. Refer to the device data sheet for

further details.

block

diagram

the

ADC

for

the

dsPIC33FJ16GP304 and dsPIC33FJ32GP204 devices

is shown in Figure 17-1. A block diagram of the ADC for

the

dsPIC33FJ32GP202

device

shown

Figure 17-2.

17.2

ADC Initialization

To configure the ADC module:

Select

port

pins

analog

inputs

(AD1PCFGH<15:0> or AD1PCFGL<15:0>).

Select voltage reference source to match

expected

range

analog

inputs

(AD1CON2<15:13>).

Select the analog conversion clock to match

desired

data

rate

with

processor

clock

(AD1CON3<7:0>).

Determine how many sample-and-hold chan-

nels will be used (AD1CON2<9:8> and

AD1PCFGH<15:0> or AD1PCFGL<15:0>).

Select

the

appropriate

sample/conversion

sequence

(AD1CON1<7:5>

and

AD1CON3<12:8>).

Select the way conversion results are presented

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

d) Turn on the ADC module (AD1CON1<15>).

Configure ADC interrupt (if required):

a) Clear the AD1IF bit.

b) Select ADC interrupt priority.

Note:

This data sheet summarizes the features

the

dsPIC33FJ32GP202/204

and

dsPIC33FJ16GP304 devices. It is not

intended to be a comprehensive reference

source. To complement the information in

this data sheet, refer to the “dsPIC33F

Family Reference Manual”.

Note:

The ADC module must be disabled before

the AD12B bit can be modified.

DSPIC33FJ32GP202-E/SP Datasheet(PDF) 169 Page - Microchip Technology

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