DSPIC33FJ06GS101TESLASHML datasheet(261/346 Pages) MICROCHIP

261 / 346 page

Preliminary

DS70318D-page 259

dsPIC33FJ06GS101/X02 and dsPIC33FJ16GSX02/X04

20.0

HIGH-SPEED ANALOG

COMPARATOR

The dsPIC33F SMPS Comparator module monitors

current and/or voltage transients that may be too fast

for the CPU and ADC to capture.

20.1

Features Overview

The SMPS comparator module offers the following

major features:

• 16 selectable comparator inputs

• Up to four analog comparators

• 10-bit DAC for each analog comparator

• Programmable output polarity

• Interrupt generation capability

• DACOUT pin to provide DAC output

• DAC has three ranges of operation:

-AVDD/2

- Internal Reference 1.2V, 1%

- External Reference < (AVDD – 1.6V)

• ADC sample and convert trigger capability

• Disable capability reduces power consumption

• Functional support for PWM module:

- PWM duty cycle control

- PWM period control

- PWM Fault detect

20.2

Module Description

Figure 20-1 shows a functional block diagram of one

analog comparator from the SMPS comparator

module. The analog comparator provides high-speed

operation with a typical delay of 20 ns. The comparator

has a typical offset voltage of ±5 mV. The negative

input of the comparator is always connected to the

DAC circuit. The positive input of the comparator is

connected to an analog multiplexer that selects the

desired source pin.

The analog comparator input pins are typically shared

with pins used by the Analog-to-Digital Converter

(ADC) module. Both the comparator and the ADC can

use the same pins at the same time. This capability

enables a user to measure an input voltage with the

ADC

and

detect

voltage

transients

with

the

comparator.

FIGURE 20-1:

COMPARATOR MODULE BLOCK DIAGRAM

Note:

This data sheet summarizes the features

the

dsPIC33FJ06GS101/X02

and

dsPIC33FJ16GSX02/X04

families

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”

Section

45.

“High-Speed

Analog

Comparator”

(DS70296), which is available on the

Microchip web site (www.microchip.com).

CMPxA(1)

CMPxC(1)

DAC

CMPPOL

AVDD/2

INTREF

CMREF

CMPx*

INSEL<1:0>

ACMPx (Trigger to PWM)(1)

Interrupt Request

CMPxB(1)

CMPxD(1)

Glitch Filter

Pulse

EXTREF

Status

AVSS

Generator

RANGE

DACOUT

DACOE

Note 1:

x = 1, 2, 3, and 4.

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