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12-Bit High-Speed, Multiple SARs A/D Converter (ADC)

HIGHLIGHTS

This section of the manual contains the following major topics:

1.0 Introduction ....................................................................................................................... 2

2.0 Registers........................................................................................................................... 5

3.0 Register Map..................................................................................................................... 7

4.0 Conversion Sequence..................................................................................................... 41

5.0 ADC Operation................................................................................................................ 41

6.0 Application Examples...................................................................................................... 60

7.0 Operation During Power-Saving Modes ......................................................................... 71

8.0 Effects of Reset............................................................................................................... 71

9.0 Related Application Notes............................................................................................... 72

10.0 Revision History .............................................................................................................. 73

dsPIC33/PIC24 Family Reference Manual

DS70005213G-page 2  2014-2019 Microchip Technology Inc.

1.0 INTRODUCTION

The dsPIC33/PIC24 12-Bit High-Speed, Multiple SARs Analog-to-Digital Converter (ADC)

includes the following features:

• Multiple ADC Cores:

- Multiple single channel dedicated ADC cores (depending on the specific device

implementation)

- One shared (common) ADC core

• Configurable 6, 8, 10 or 12-Bit Resolution for each ADC Core

• Up to 3.25 Msps Conversion Rate per Channel for 12-Bit Resolution

• Up to 32 Analog Input Sources (depending on the specific device implementation)

• Single-Ended or Pseudodifferential Inputs on a per Channel Basis for All Channels

• Conversion Result can be Formatted as Unsigned or Signed Data on a per Channel Basis

for All Channels

• Separate 16-Bit Conversion Result Register for each Analog Input

• Early Interrupt Generation to enable Fast Processing of Converted Data

• Multiple Integrated Digital Comparators (depending on the specific device implementation):

- Multiple comparison options

- Assignable to specific analog inputs

• Multiple Oversampling Filters (depending on the specific device implementation):

- Provides increased resolution

- Assignable to a specific analog input

• Operation during CPU Sleep and Idle modes

Simplified block diagrams of the Multiple SARs 12-Bit ADC are illustrated in Figure 1-1,

Figure 1-2 and Figure 1-3.

The module consists of a few independent SAR ADC cores. The analog inputs (channels) are

connected through multiplexers and switches to the Sample-and-Hold (S/H) circuit of each ADC

core. The core uses the channel information (output format, Measurement mode and input

number) to process the analog sample. When conversion is complete, the result is stored in the

result buffer for the specific analog input, and passed to the digital filter and digital comparator if

they were configured to use data from this particular channel.

Note: This family reference manual section is meant to serve as a complement to device

data sheets. Depending on the device variant, this manual section may not apply to

all dsPIC33/PIC24 devices. Please consult the note at the beginning of the chapter

in the specific device data sheet to check whether this document supports the

device you are using.

Device data sheets and family reference manual sections are available for

download from the Microchip Worldwide Website at: http://www.microchip.com.

 2014-2019 Microchip Technology Inc. DS70005213G-page 3

12-Bit High-Speed, Multiple SARs A/D Converter (ADC)

Figure 1-1: 12-Bit High-Speed, Multiple SARs ADC Block Diagram

Dedicated ADC

Core 0

Reference Voltage Selection

(1)

(REFSEL[2:0] bits)

Clock Source Selection(1)

(CLKSEL[1:0] bits)

Clock Source Divider

(CLKDIV[5:0] bits)

Reference

Output Data

Clock

Output Data

Digital Comparator 0 ADCMP0Interrupt

Digital Comparator x ADCMPxInterrupt

Digital Filter 0

Digital Filter x

ADFL0DAT

ADFLxDAT

ADCBUF0

ADCBUF1

ADCBUFx

ADCAN0Interrupt

ADCAN1Interrupt

ADCANxInterrupt

ADFL0Interrupt

ADFLxInterrupt

Dedicated ADC

Core 1

Shared ADC Core

Analog

Inputs

Analog

Inputs

Analog

Inputs

(See Figure 1-2)

(See Figure 1-3)

(See Figure 1-2)

Note 1: Options are device-specific. Refer to the device data sheet for more information.

Produktspecifikationer

Varumärke:	Microchip
Kategori:	Inte kategoriserad
Modell:	dsPIC33CK64MP105

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