PIC18LF4331 datasheet(173/392 Pages) MICROCHIP

173 / 392 page

 2010 Microchip Technology Inc.

DS39616D-page 173

PIC18F2331/2431/4331/4431

18.0

POWER CONTROL PWM

MODULE

The Power Control PWM module simplifies the task of

generating

multiple,

synchronized

Pulse-Width

Modulated (PWM) outputs for use in the control of

motor controllers and power conversion applications.

In particular, the following power and motion control

applications are supported by the PWM module:

• Three-Phase and Single-Phase AC Induction

Motors

• Switched Reluctance Motors

• Brushless DC (BLDC) Motors

• Uninterruptible Power Supplies (UPS)

• Multiple DC Brush Motors

The PWM module has the following features:

• Up to eight PWM I/O pins with four duty cycle

generators. Pins can be paired to get a complete

half-bridge control.

• Up to 14-bit resolution, depending upon the PWM

period.

• “On-the-fly” PWM frequency changes.

• Edge and Center-Aligned Output modes.

• Single-Pulse Generation mode.

• Programmable dead-time control between paired

PWMs.

• Interrupt support for asymmetrical updates in

Center-Aligned mode.

• Output override for Electrically Commutated

Motor (ECM) operation; for example, BLDC.

• Special Event Trigger comparator for scheduling

other peripheral events.

• PWM outputs disable feature sets PWM outputs

to their inactive state when in Debug mode.

The Power Control PWM module supports three PWM

generators

and

six

output

channels

PIC18F2331/2431 devices, and four generators and

eight channels on PIC18F4331/4431 devices. A simpli-

fied block diagram of the module is shown in

Figure 18-1. Figure 18-2 and Figure 18-3 show how

the module hardware is configured for each PWM

output pair for the Complementary and Independent

Output modes.

Each functional unit of the PWM module will be

discussed in subsequent sections.

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