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Almost any fault detection circuit can be connected to any fault input on any DPWM. The only exception is
the Analog Peak Current mode, which can only be connected to the CLIM fault input:
FaultMuxRegs.DPWM0CLIM.bit.ANALOG_PCM_EN = 1;
6.8
DPWM Fault Action
The final section in the fault chain is the fault action, which takes place in the DPWM module. Here is a
drawing showing the main points of fault action:
Fault
Mux
CLIM/
CBC
(CBC_FAULT_EN)
FAULT
AB
FAULT
A
FAULT
B
This drawing fits in with the overview of the DPWM in
handler portion. The connection of the CLIM/CBC signal to the Timing Generation Module is also shown.
For information on the effect of CLIM/CBC in the timing module, see
that section affect the CLIM/CBC signal which is sent to the Timing Generator.
the Blanking Registers in the DPWM, which permit blanking of the CLIM/CBC signal to the
Generation
section. These registers are used to prevent switching noise from causing false triggers of the
CBC logic. They can also be used to synchronize CBC triggers between DPWMs with different on-times.
The blanking registers affect different edges depending on topology. The effects are as follows:
•
For normal and resonant modes, blanking A and B windows are applied to PWM-A only
•
For triangular mode, blanking A and B windows are applied to PWM-B only
•
For all other modes, blanking A and B windows are applied to PWM-A and PWM-B respectively
SNIU028A – February 2016 – Revised April 2016
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DPWM
CBC Blanking
(Blanking Registers)
Fault Enable
Counter Module
(CBC_MAX_COUNT)
Counter Module
(AB_MAX_COUNT)
Counter Module
(A_MAX_COUNT)
Counter Module
(B_MAX_COUNT)
Fault Enable
(ALL_FAULT_EN)
Figure 6-3. UCD3138 DPWM Fault Action
Copyright © 2016, Texas Instruments Incorporated
Timing Generation
DPWMA
DPWMB
A and B both off
A off
B off
Edge Generation
Figure
2-1. The portion expanded here is the fault
Section
2.15.3. The bits described in
Chapter 2
DPWM Fault Action
DPWMC
also describes
Timing
231
Fault Mux
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