Datasheet

© 2007-2012 Microchip Technology Inc. DS70283K-page 159
dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304
15.0 MOTOR CONTROL PWM
MODULE
The dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304
device supports up to two dedicated Pulse-Width
Modulation (PWM) modules. The PWM1 module is a
6-channel PWM generator, and the PWM2 module is a
2-channel PWM generator.
The PWM module has the following features:
• Up to 16-bit resolution.
• On-the-fly PWM frequency changes.
• Edge and Center-Aligned Output modes.
• Single Pulse Generation mode.
• Interrupt support for asymmetrical updates in
Center-Aligned mode.
• Output override control for Electrically
Commutative Motor (ECM) operation or BLDC.
• Special Event comparator for scheduling other
peripheral events.
• Fault pins to optionally drive each of the PWM
output pins to a defined state.
Duty cycle updates configurable to be immediate or
synchronized to the PWM time base.
15.1 PWM1: 6-Channel PWM Module
This module simplifies the task of generating multiple
synchronized PWM outputs. The following power and
motion control applications are supported by the PWM
module:
• 3-Phase AC Induction Motor
• Switched Reluctance (SR) Motor
• Brushless DC (BLDC) Motor
• Uninterruptible Power Supply (UPS)
This module contains three duty cycle generators,
numbered 1 through 3. The module has six PWM
output pins, numbered PWM1H1/PWM1L1 through
PWM1H3/PWM1L3. The six I/O pins are grouped into
high/low numbered pairs, denoted by the suffix H or L,
respectively. For complementary loads, the low PWM
pins are always the complement of the corresponding
high I/O pin.
15.2 PWM2: 2-Channel PWM Module
This module provides an additional pair of
complimentary PWM outputs that can be used for:
• Independent PFC correction in a motor system
• Induction cooking
This module contains a duty cycle generator that
provides two PWM outputs, numbered
PWM2H1/PWM2L1.
Note 1: This data sheet summarizes the features
of the dsPIC33FJ32MC202/204 and
dsPIC33FJ16MC304 family of devices. It
is not intended to be a comprehensive
reference source. To complement the
information in this data sheet, refer to
Section 14. “Motor Control PWM”
(DS70187) of 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.