UCD3138 datasheet(35/99 Pages) TI2

35 / 99 page

9.5.3 DPWMC, Edge Generation, IntraMux

The UCD3138 has hardware for generating complex waveforms beyond the simple DPWMA and DPWMB

waveforms already discussed – DPWMC, the Edge Generation Module, and the IntraMux.

DPWMC is a signal inside the DPWM logic. It goes high at the Blanking A begin time, and low at the Blanking A

end time.

The Edge Gen module takes DPWMA and DPWMB from its own DPWM module, and the next one, and uses

them to generate edges for two outputs. For DPWM3, the DPWM0 is considered to be the next DPWM. Each

edge (rising and falling for DPWMA and DPWMB) has 8 options which can cause it.

The options are:

0 = DPWM(n) A Rising edge

1 = DPWM(n) A Falling edge

2 = DPWM(n) B Rising edge

3 = DPWM(n) B Falling edge

4 = DPWM(n+1) A Rising edge

5 = DPWM(n+1) A Falling edge

6 = DPWM(n+1) B Rising edge

7 = DPWM(n+1) B Falling edge

Where “n" is the numerical index of the DPWM module of interest. For example n=1 refers to DPWM1.

The Edge Gen is controlled by the DPWMEDGEGEN register. It also has an enable/disable bit.

The IntraMux is controlled by the Auto Config registers. Intra Mux is short for intra multiplexer. The IntraMux

takes signals from multiple DPWMs and from the Edge Gen and combines them logically to generate DPWMA

and DPWMB signals This is useful for topologies like phase-shifted full bridge, especially when they are

controlled with automatic mode switching. Of course, it can all be disabled, and DPWMA and DPWMB will

be driven as described in the sections above. If the Intra Mux is enabled, high resolution must be disabled, and

DPWM edge resolution goes down to 4 ns.

Here is a drawing of the Edge Gen/Intra Mux:

A ON SELECT

A OFF SELECT

B ON SELECT

B OFF SELECT

EGEN A

EGEN B

EDGE GEN

PWM A

PWM B

B SELECT

A SELECT

INTRAMUX

A/B/C (N)

A/B/C (N+1)

C (N+2)

C (N+3)

A(N)

B(N)

A(N+1)

B(N+1)

Figure 9-5. Edge Gen/Intra Mux

Here is a list of the IntraMux modes for DPWMA:

0 = DPWMA(n) pass through (default)

1 = Edge-gen output, DPWMA(n)

2 = DPWNC(n)

www.ti.com

UCD3138

SLUSAP2J – MARCH 2012 – REVISED NOVEMBER 2021

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