UCD3138RJAT datasheet(52/99 Pages) TI2

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9.6.3 DPWM Multiple Output Mode

Multi mode is used for systems where each phase has only one driver signal. It enables each DPWM peripheral

to drive two phases with the same pulse width, but with a time offset between the phases, and with different

cycle adjusts for each phase.

Here is a diagram for Multi-Mode:

Adaptive Sample Trigger B

Start of Period

Period Counter

Start of Period

Period

Adaptive Sample Trigger A

DPWM Output A

Cycle Adjust A (High Resolution)

Filter Duty (High Resolution)

Event 1

To Other

Modules

Multi Mode Closed Loop

Events which change with DPWM mode:

DPWM A Rising Edge = Event 1

DPWM A Falling Edge = Event 1 + Filter Duty + Cycle Adjust A

Adaptive Sample Trigger A = Event 1 + Filter Duty + Adaptive Sample Register or

Adaptive Sample Trigger B = Event 1 + Filter Duty/2 + Adaptive Sample Register

DPWM B Rising Edge = Event 3

DPWM B Falling Edge = Event 3 + Filter Duty + Cycle Adjust B

Phase Trigger = Phase Trigger Register value or Filter Duty

Events always set by their registers, regardless of mode:

Sample Trigger 1, Sample Trigger 2, Blanking A Begin , Blanking A End , Blanking B

Begin, Blanking B End

Filter controlled edge

Event 3 (High Resolution)

Cycle Adjust B (High Resolution)

Filter Duty (High Resolution)

DPWM Output B

Blanking B Begin

Blanking B End

Phase Trigger

Sample Trigger 2

To Other

Modules

Sample Trigger 1

Blanking A Begin

Blanking A End

Figure 9-19. Multi Mode Closed Loop

Event 2 and Event 4 are not relevant in Multi mode.

DPWMB can cross over the period boundary safely, and still have the proper pulse width, so full 100% pulse

width operation is possible. DPWMA cannot cross over the period boundary.

UCD3138

SLUSAP2J – MARCH 2012 – REVISED NOVEMBER 2021

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