App note: High-Speed PWM module on PIC24E and dsPIC33E

Here’s a reference guide from Microchip about the high-speed PWM modules found on some PIC24E and dsPIC33E microcontrollers and digital signal processors.

This module is a advanced version of the standard ECCP pulse-width modulator on PIC microcontrollers. It’s designed mainly for power conversion and electric motor control. The feature list is impressive:

• 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.

The resolution of this module is just 7.14nS, which means it can output a PWM signal at 500KHz with a resolution of 8bits.

This entry was posted in Uncategorized.