Texas Instruments AM335 Series Technical Reference Manual

CTR = CMPB
CTR = CMPA
CTR_Dir
CTR = 0
CTR = PRD
Dead
Band
(DB)
Counter
Compare
(CC)
Action
Qualifier
(AQ)
EPWMxA
EPWMxB
CTR = CMPB
CTR = 0
EPWMxINT
EPWMxA
EPWMxB
TZ1
to TZn
CTR = CMPA
Time-Base
(TB)
CTR = PRD
CTR = 0
CTR_Dir
EPWMxSYNCI
EPWMxSYNCO
EPWMxTZINT
PWM-
chopper
(PC)
Event
Trigger
and
Interrupt
(ET)
Trip
Zone
(TZ)
GPIO
MUX
Interrupt
controller
Interrupt
controller
Enhanced PWM (ePWM) Module www.ti.com
15.2.2.6 Dead-Band Generator (DB) Submodule
Figure 15-33 illustrates the dead-band generator submodule within the ePWM module.
Figure 15-33. Dead-Band Generator Submodule
15.2.2.6.1 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 generator submodule should be used.
The key functions of the dead-band generator submodule 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)
15.2.2.6.2 Controlling and Monitoring the Dead-Band Submodule
The dead-band generator submodule operation is controlled and monitored via the following registers:
Table 15-33. Dead-Band Generator Submodule Registers
Acronym Register Description Address Offset Shadowed
DBCTL Dead-Band Control Register 1Eh No
DBRED Dead-Band Rising Edge Delay Count Register 20h No
DBFED Dead-Band Falling Edge Delay Count Register 22h No
1534
Pulse-Width Modulation Subsystem (PWMSS) SPRUH73H–October 2011–Revised April 2013
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Texas Instruments AM335 Series Specifications

General

Brand	Texas Instruments
Model	AM335 Series
Category	Computer Hardware
Language	English