ePWM Submodules
7.2.5 Dead-Band Generator (DB) Submodule
Figure 7-30
illustrates the dead-band submodule within the ePWM module.
EPWMxSYNCI
EPWMxSYNCO
Time-Base
(TB)
Digital Compare
Signals
Counter
Compare
(CC)
7.2.5.1
Purpose of the Dead-Band Submodule
The "Action-qualifier (AQ) Module" section discussed how it is possible to generate the required dead-
band by having full control over edge placement using both the CMPA and CMPB resources of the ePWM
module. However, if the more classical edge delay-based dead-band with polarity control is required, then
the dead-band submodule described here should be used.
The key functions of the dead-band module are:
•
Generating appropriate signal pairs (EPWMxA and EPWMxB) with dead-band relationship from a
single EPWMxA input
•
Programming signal pairs for:
– Active high (AH)
– Active low (AL)
– Active high complementary (AHC)
– Active low complementary (ALC)
•
Adding programmable delay to rising edges (RED)
•
Adding programmable delay to falling edges (FED)
•
Can be totally bypassed from the signal path (note dotted lines in diagram)
7.2.5.2
Dead band Submodule Additonal Operating Modes
On type 1 ePWM RED could appear on one channel output and FED could appear on the other channel
output.
The following list shows the distinct difference between type 1 and type 2 modules with respect to Dead
Band operating modes
676
C28 Enhanced Pulse Width Modulator (ePWM) Module
Figure 7-30. Dead_Band Submodule
Action
Counter Compare
Qualifier
(AQ)
CTR = PRD
Digital Compare
CTR = 0
CTR_Dir
ePWMxA
ePWMxB
Dead
Band
CTR = CMPA
(DB)
CTR = CMPB
CTR = CMPC
CTR = CMPD
PIE
Copyright © 2012–2019, Texas Instruments Incorporated
Time Base
EPWMxINT
Signals
Event
Trigger
EPWMxSOCA
and
Signals
Interrupt
(ET)
Signals
EPWMxSOCB
ePWMxA
ePWMxB
PWM-
chopper
(PC)
Trip
TZ1 to TZ3
Zone
(TZ)
EMUSTOP
CTR = PRD
CLOCKFAIL
CTR = 0
EQEPxERR
EPWMxTZINT
Digital
Compare
Digital Compare
(DC)
Signals
SPRUH22I – April 2012 – Revised November 2019
www.ti.com
PIE
ADC
GPIO
GPIO
MUX
MUX
GPTRIP
CPU
SYSCTRL
EQEPx
TZ1
to
TZ3
ECCDBLERR
28x RAM/
Flash ECC
PIEERR
COMPxOUT
GPTRIP
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