UCD3138 datasheet(23/99 Pages) TI2

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Start of Period

Period Counter

Start of Period

Period

Sample Trigger 1

DPWM Output A

Cycle Adjust A (High Resolution)

Event 2 (High Resolution)

Event 1

Event 3 (High Resolution)

Cycle Adjust B (High Resolution)

Event 4 (High Resolution)

DPWM Output B

Blanking A Begin

Blanking A End

Blanking B Begin

Blanking B End

Phase Trigger

Sample Trigger 2

To Other

Modules

To Other

Modules

Multi Mode Open Loop

Events which change with DPWM mode:

DPWM A Rising Edge = Event 1

DPWM A Falling Edge = Event 2 + Cycle Adjust A

DPWM B Rising Edge = Event 3

DPWM B Falling Edge = Event 4 + Cycle Adjust B

Phase Trigger = Phase Trigger Register value

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 8-6. Multi Mode Open Loop

8.8.1.4 High Resolution DPWM

Unlike conventional PWM controllers where the frequency of the clock dictates the maximum resolution of PWM

edges, the UCD3138 DPWM can generate waveforms with resolutions as small as 250 ps. This is 16× the

resolution of the clock driving the DPWM module.

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UCD3138

SLUSAP2J – MARCH 2012 – REVISED NOVEMBER 2021

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