I2CCON datasheet(113/210 Pages) MICROCHIP

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DS70139G-page 113

dsPIC30F2011/2012/3012/3013

16.0

12-BIT ANALOG-TO-DIGITAL

CONVERTER (ADC) MODULE

The

12-bit

Analog-to-Digital

Converter

allows

conversion of an analog input signal to a 12-bit digital

number. This module is based on a Successive

Approximation

(SAR)

architecture

and

provides a maximum sampling rate of 200 ksps. The

ADC module has up to 10 analog inputs which are

multiplexed into a sample and hold amplifier. The

output of the sample and hold is the input into the

converter which generates the result. The analog

reference voltage is software selectable to either the

device supply voltage (AVDD/AVSS) or the voltage level

on the (VREF+/VREF-) pin. The ADC has a unique

feature of being able to operate while the device is in

Sleep mode with RC oscillator selection.

The ADC module has six 16-bit registers:

• A/D Control Register 1 (ADCON1)

• A/D Control Register 2 (ADCON2)

• A/D Control Register 3 (ADCON3)

• A/D Input Select Register (ADCHS)

• A/D Port Configuration Register (ADPCFG)

• A/D Input Scan Selection Register (ADCSSL)

The ADCON1, ADCON2 and ADCON3 registers

control the operation of the ADC module. The ADCHS

ADPCFG register configures the port pins as analog

inputs or as digital I/O. The ADCSSL register selects

inputs for scanning.

The block diagram of the 12-bit ADC module is shown

in Figure 16-1.

FIGURE 16-1:

12-BIT ADC FUNCTIONAL BLOCK DIAGRAM

Note:

This data sheet summarizes features of

this group of dsPIC30F devices and is not

intended to be a complete reference

source. For more information on the CPU,

peripherals,

descriptions

and

general device functionality, refer to the

“dsPIC30F Family Reference Manual”

(DS70046).

Note:

The SSRC<2:0>, ASAM, SMPI<3:0>,

BUFM and ALTS bits, as well as the

ADCON3 and ADCSSL registers, must

not be written to while ADON = 1. This

would lead to indeterminate results.

Comparator

12-bit SAR

Conversion Logic

AVDD/VREF+

DAC

16-word, 12-bit

Dual Port

Buffer

0000

0101

0111

1001

0001

0010

0011

0100

0110

1000

AN8

AN9

AN4

AN5

AN6

AN7

AN0

AN1

AN2

AN3

CH0

AVSS/VREF-

Sample/Sequence

Control

Sample

Input MUX

Control

Input

Switches

S/H

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