UCD3138ARMHT datasheet(52/87 Pages) TI1

52 / 87 page

Start of Period

Period Counter

Start of Period

Period

DPWM Output A

Cycle Adjust A (High Resolution)

Filter Duty (High Resolution)

Event 1

To Other

Modules

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

DTC Adjustment

Adaptive Sample Trigger B

Adaptive Sample Trigger A

UCD3138A

SLUSC66C – MARCH 2015 – REVISED SEPTEMBER 2016

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Detailed Description

7.1.2

DPWM Multiple Output Mode

The device uses multi-mode functionality in 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.

The diagram for Multi-Mode is shown in Figure 7-2.

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.

Since the rising edge on DPWM B is also fixed, Blanking B-Begin and Blanking B-End can be used for

blanking this rising edge.

Cycle Adjust B is usable on DPWM B.

Events which change with DPWM mode:

•

DPWM A Rising Edge = Event 1

•

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

•

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 + DTC Adjustment

•

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

Figure 7-2. Multi Mode Closed Loop

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