TMS320F280049M_17 Datasheet, PDF (136/214 Pages) Texas Instruments – Piccolo Microcontrollers

TMS320F280049M
SPRS945 – JANUARY 2017
www.ti.com
5.10.5 High-Resolution Pulse Width Modulator (HRPWM)
The HRPWM combines multiple delay lines in a single module and a simplified calibration system by using
a dedicated calibration delay line. For each ePWM module, there are two HR outputs:
• HR Duty and Deadband control on Channel A
• HR Duty and Deadband control on Channel B
The HRPWM module offers PWM resolution (time granularity) that 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
• This capability can be used in both single edge (duty cycle and phase-shift control) as well as dual-
edge control for frequency/period modulation.
• Finer time granularity control or edge positioning is controlled through extensions to the Compare A, B,
phase, period, and deadband registers of the ePWM module.
NOTE
The minimum HRPWMCLK frequency allowed for HRPWM is 60 MHz.
5.10.5.1 HRPWM Electrical Data and Timing
Table 5-70 lists the high-resolution PWM switching characteristics.
Table 5-70. High-Resolution PWM Characteristics
PARAMETER
Micro Edge Positioning (MEP) step size⁽¹⁾
MIN TYP
150
MAX UNIT
310 ps
(1) The MEP step size will be largest at high temperature and minimum voltage on VDD. MEP step size will increase with higher
temperature and lower voltage and decrease with lower temperature and higher voltage.
Applications that use the HRPWM feature should use MEP Scale Factor Optimizer (SFO) estimation software functions. See the TI
software libraries for details of using SFO function in end applications. SFO functions help to estimate the number of MEP steps per
SYSCLK period dynamically while the HRPWM is in operation.
136 Specifications
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