SM320F28335-HT Datasheet, PDF (59/158 Pages) Texas Instruments – Digital Signal Controller (DSC)

SM320F28335-HT
www.ti.com
SPRS682 – DECEMBER 2010
4.4 High-Resolution PWM (HRPWM)
The HRPWM module offers PWM resolution (time granularity) which is significantly better than what can be achieved using conventionally derived
digital PWM methods. The key points for the HRPWM module are:
• Significantly extends the time resolution capabilities of conventionally derived digital PWM
• Typically used when effective PWM resolution falls below ~ 9-10 bits. This occurs at PWM frequencies greater than ~200 kHz when using a
CPU/System clock of 100 MHz.
• This capability can be utilized in both duty cycle and phase-shift control methods.
• Finer time granularity control or edge positioning is controlled via extensions to the Compare A and Phase registers of the ePWM module.
• HRPWM capabilities are offered only on the A signal path of an ePWM module (i.e., on the EPWMxA output). EPWMxB output has
conventional PWM capabilities.
4.5 Enhanced CAP Modules (eCAP1/2/3/4/5/6)
The F28335 contains up to six enhanced capture (eCAP) modules. Figure 4-6 shows a functional block diagram of a module.
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