DSPIC33FJ16GS402-I/ML 查看數據表（PDF） - Microchip Technology

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DSPIC33FJ16GS402-I/ML

High-Performance, 16-bit Digital Signal Controllers

Microchip Technology 

dsPIC33FJ06GS101/X02 and dsPIC33FJ16GSX02/X04

20.0 HIGH-SPEED ANALOG

COMPARATOR

Note:

This data sheet summarizes the features

of the dsPIC33FJ06GS101/X02 and

dsPIC33FJ16GSX02/X04 families of

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).

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

CMPxA(1)

CMPxB(1)

CMPxC(1)

INSEL<1:0>

M

U

X

ACMPx (Trigger to PWM)(1)

Status

CMPxD(1)

AVDD/2

INTREF

RANGE

M

U

DAC

X

AVSS 10

CMREF

CMPx*

0

1

CMPPOL

Glitch Filter

DACOUT

DACOE

Pulse

Generator

Interrupt Request

EXTREF

Note 1: x = 1, 2, 3, and 4.

© 2009 Microchip Technology Inc.

Preliminary

DS70318D-page 259

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