PIC32MX795F512LT-80ISLASHPF datasheet(153/256 Pages) MICROCHIP

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DS61156G-page 153

PIC32MX5XX/6XX/7XX

22.0 10-BIT ANALOG-TO-DIGITAL

CONVERTER (ADC)

The PIC32MX5XX/6XX/7XX 10-bit Analog-to-Digital

Converter (ADC) includes the following features:

• Successive Approximation Register (SAR)

conversion

• Up to 1 Msps conversion speed

• Up to 16 analog input pins

• External voltage reference input pins

• One unipolar, differential Sample and Hold

Amplifier (SHA)

• Automatic Channel Scan mode

• Selectable conversion trigger source

• 16-word conversion result buffer

• Selectable buffer fill modes

• Eight conversion result format options

• Operation during CPU Sleep and Idle modes

A block diagram of the 10-bit ADC is illustrated in

Figure 22-1. The 10-bit ADC has up to 16 analog input

pins, designated AN0-AN15. In addition, there are two

analog input pins for external voltage reference

connections. These voltage reference inputs may be

shared with other analog input pins and may be

common to other analog module references.

The analog inputs are connected through two multi-

plexers (MUXs) to one SHA. The analog input MUXs

can be switched between two sets of analog inputs

between conversions. Unipolar differential conversions

are possible on all channels, other than the pin used as

the reference, using a reference input pin (see

Figure 22-1).

The Analog Input Scan mode sequentially converts

user-specified channels. A control register specifies

which analog input channels will be included in the

scanning sequence.

The 10-bit ADC is connected to a 16-word result buffer.

Each 10-bit result is converted to one of eight 32-bit

output formats when it is read from the result buffer.

FIGURE 22-1:

ADC1 MODULE BLOCK DIAGRAM

Note 1:

This data sheet summarizes the features

of the PIC32MX5XX/6XX/7XX family of

devices. It is not intended to be a

comprehensive reference source. To

complement the information in this data

sheet, refer to Section 17. “10-bit

Analog-to-Digital Converter (ADC)”

(DS61104)

the

“PIC32

Family

Reference Manual”

, which is available

from

the

Microchip

web

site

(www.microchip.com/PIC32).

Some registers and associated bits

described in this section may not be

available on all devices. Refer to

Section 4.0 “Memory Organization”

this data sheet for device-specific register

and bit information.

SAR ADC

S/H

ADC1BUF0

ADC1BUF1

ADC1BUF2

ADC1BUFF

ADC1BUFE

AN0

AN15

AN1

VREFL

CH0SB<4:0>

CH0NA CH0NB

CH0SA<4:0>

Channel

Scan

CSCNA

Alternate

VREF+(1) AVDD

AVSS

VREF-(1)

Note

VREF+ and VREF- inputs can be multiplexed with other analog inputs.

Input Selection

VREFH

VREFL

VCFG<2:0>

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