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High-Speed PWM

Section 14. High-Speed PWM

HIGHLIGHTS

This section of the manual contains the following major topics:

14.1 Introduction .................................................................................................................. 14-2

14.2 Features....................................................................................................................... 14-2

14.3 Control Registers ......................................................................................................... 14-3

14.4 Architecture Overview................................................................................................ 14-24

14.5 Module Description .................................................................................................... 14-27

14.6 PWM Operating Modes.............................................................................................. 14-33

14.7 PWM Generator......................................................................................................... 14-71

14.8 PWM Trigger.............................................................................................................. 14-87

14.9 PWM Interrupts.......................................................................................................... 14-98

14.10 PWM Fault Pins ......................................................................................................... 14-99

14.11 Special Features ...................................................................................................... 14-105

14.12 PWM Output Pin Control...........................................................................................14-111

14.13 Immediate Update of PWM Duty Cycle ................................................................... 14-113

14.14 Power-Saving Modes............................................................................................... 14-114

14.15 External Control of Individual Time Base(s)............................................................. 14-114

14.16 Application Information ............................................................................................ 14-115

14.17 Register Map............................................................................................................ 14-126

14.18 Related Application Notes........................................................................................ 14-127

14.19 Revision History ....................................................................................................... 14-128

dsPIC33E/PIC24E Family Reference Manual

14.1 INTRODUCTION

This section describes the High-Speed Pulse-Width Modulator (PWM) module and its

associated operational modes. The High-Speed PWM module in the dsPIC33E/PIC24E

device family supports a wide variety of PWM modes and is ideal for power

conversion/motor control applications. Some of the common applications include:

• AC-to-DC converters

• DC-to-DC converters

• AC and DC motors: BLDC, PMSM, ACIM, SRM, etc.

• Inverters

• Battery chargers

• Digital lighting

• Uninterrupted Power Supply (UPS)

• Power Factor Correction (PFC) (e.g., Interleaved PFC and Bridgeless PFC)

14.2 FEATURES

The High-Speed PWM module consists of the following major features:

• Up to seven PWM generators, each with an individual time base

• Two PWM outputs per PWM generator

• Individual period and duty cycle for each PWM output

• Duty cycle, dead time, phase shift and frequency resolution equal to the system clock

source (TOSC)

• Independent fault and current-limit inputs for up to 14 PWM outputs

• Redundant Output mode

• Independent Output mode (this feature is not available on all devices)

• Push-Pull Output mode

• Complementary Output mode

• Center-Aligned PWM mode

• Output override control

• Special Event Trigger

• PWM capture feature

• Prescaler for input clock

• ADC triggering with PWM

• Independent PWM frequency, duty cycle and phase shift changes

• Leading-Edge Blanking (LEB) functionality

• Dead time compensation

• Output clock chopping

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 dsPIC33E/PIC24E devices.

Please consult the note at the beginning of the “High-Speed PWM” chapter in the

current 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 Web site at: http://www.microchip.com

Section 14. High-Speed PWM

High-Speed PWM

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

PWMKEY<15:8>

bit 15 bit 8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

PWMKEY<7:0>

bit 7 bit 0

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 15-0 PWMKEY<15:0>: PWM Unlock bits

If the PWMLOCK Configuration bit is asserted (PWMLOCK = 1), the IOCONx and FCLCONx registers

are writable only after the proper sequence is written to the PWMKEY register. If the PWMLOCK

Configuration bit is deasserted (PWMLOCK = 0), the IOCONx and FCLCONx registers are writable at

all times. Refer to 14.5.3 “Write Protection” for further details of the unlock sequence.

Note 1: This register is implemented only in devices where the PWMLOCK Configuration bit is present in the

FOSCSEL Configuration register.

dsPIC33E/PIC24E Family Reference Manual

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

IFLTMOD(4) CLSRC<4:0>(2,3) CLPOL(1) CLMOD

bit 15 bit 8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

FLTSRC<4:0>(2,3) FLTPOL(1) FLTMOD<1:0>(4)

bit 7 bit 0

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 15 IFLTMOD: Independent Fault Mode Enable bit

(4)

1 = Independent Fault mode: Current-limit input maps FLTDAT<1> to PWMxH output, and fault input

maps FLTDAT<0> to PWMxL output. The CLDAT<1:0> bits are not used for override functions.

0= Normal Fault mode: Current-limit and fault inputs map CLDAT<1:0> and FLTDAT<1:0> to PWMxH

and PWMxL outputs.

bit 14-10 CLSRC<4:0>: Current-Limit Control Signal Source Select bits for PWM Generator #

(2,3)

These bits specify the current-limit control signal source. Refer to the “High-Speed PWM” chapter of

the specific device data sheet for available selections.

bit 9 CLPOL: Current-Limit Polarity bit for PWM Generator #(1)

1 = The selected current-limit source is active-low

0 = The selected current-limit source is active-high

bit 8 CLMOD: Current-Limit Mode Enable bit for PWM Generator #

1 = Current-Limit mode is enabled

0 = Current-Limit mode is disabled

bit 7-3 FLTSRC<4:0>: Fault Control Signal Source Select bits for PWM Generator #

(2,3)

These bits specify the Fault control source. Refer to the “High-Speed PWM” chapter of the specific

device data sheet for available selections.

bit 2 FLTPOL: Fault Polarity bit for PWM Generator #(1)

1 = The selected fault source is active-low

0 = The selected fault source is active-high

bit 1-0 FLTMOD<1:0>: Fault Mode bits for PWM Generator #(4)

11 = Fault input is disabled

10 = Reserved

01 = The selected fault source forces PWMxH, PWMxL pins to FLTDAT values (cycle)

00 = The selected fault source forces PWMxH, PWMxL pins to FLTDAT values (latched condition)

Note 1: These bits should be changed only when PTEN = 0. Changing the polarity selection during operation will

yield unpredictable results.

2: When Independent Fault mode is enabled (IFLTMOD = 1) and Fault 1 is used for Fault mode

(FLTSRC<4:0> = b0000), the Current-Limit Control Source Select bits (CLSRC<4:0>) should be set to an

unused current-limit source to prevent the current-limit source from disabling both the PWMxH and

PWMxL outputs.

3: When Independent Fault mode is enabled (IFLTMOD = 1), and Fault 1 is used for Current-Limit mode

(CLSRC<4:0> = b0000), the Fault Control Source Select bits (FLTSRC<4:0>) should be set to an unused

fault source to prevent Fault 1 from disabling both the PWMxL and PWMxH outputs.

4: This feature is not available on all devices. Refer to the “High-Speed PWM” chapter of the specific device

data sheet for availability.

Termékspecifikációk

Márka:	Microchip
Kategória:	nincs kategorizálva
Modell:	DSPIC33EP128MC502

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