DSPIC33FJ64GS406 datasheet(341/456 Pages) MICROCHIP

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 2009-2012 Microchip Technology Inc.

DS70591E-page 341

dsPIC33FJ32GS406/606/608/610 and dsPIC33FJ64GS406/606/608/610

23.0 HIGH-SPEED ANALOG

COMPARATOR

The dsPIC33F Switch Mode Power Supply (SMPS)

comparator module monitors current and/or voltage

transients that may be too fast for the CPU and ADC to

capture.

23.1

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 (INTREF)

- External Reference (EXTREF)

• 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

23.2

Module Description

Figure 23-1 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 23-1:

HIGH-SPEED ANALOG COMPARATOR x MODULE BLOCK DIAGRAM

Note 1: This data sheet summarizes the features of

the dsPIC33FJ32GS406/606/608/610 and

dsPIC33FJ64GS406/606/608/610

fami-

lies of devices. It is not intended to be a

comprehensive reference source. To

complement the information in this data

sheet, refer to Section 45. “High-Speed

Analog Comparator” (DS70296) in the

“dsPIC33F/PIC24H

Family

Reference

Manual”, which is available from the

Microchip web site (www.microchip.com).

2: Some registers and associated bits

described in this section may not be

available on all devices. Refer to

Section 4.0 “Memory Organization” in

this data sheet for device-specific register

and bit information.

CMPxA*

CMPxC*

DAC

CMPPOL

AVDD/2

INTREF(1)

CMREF

CMPx*

INSEL<1:0>

Trigger to PWM

Interrupt

CMPxB*

CMPxD*

Pulse

EXTREF(1)

Status

AVSS

Generator

RANGE

DACOUT

DACOE

* x = 1, 2, 3 and 4

Note 1:

Refer to Parameters DA01 and DA08 in the DAC Module Specifications (Table 27-43) for details.

Glitch Filter

Request

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