TMS320F28075PZP datasheet(116/192 Pages) TI

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7.11.4 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.

7.11.4.1 HRPWM Electrical Data and Timing

Section 7.11.4.1.1 lists the high-resolution PWM timing requirements. Section 7.11.4.1.2 lists the high-resolution

PWM switching characteristics.

7.11.4.1.1 High-Resolution PWM Timing Requirements

MIN

MAX

UNIT

f(EPWM)

Frequency, EPWMCLK(1)

100

MHz

f(HRPWM)

Frequency, HRPWMCLK

100

MHz

(1)

For SYSCLK above 100 MHz, the EPWMCLK must be half of SYSCLK.

7.11.4.1.2 High-Resolution PWM Characteristics

PARAMETER

MIN

TYP

MAX UNIT

Micro Edge Positioning (MEP) step size(1)

150

310

(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 functions in end applications. SFO functions help to estimate the number of MEP steps per

SYSCLK period dynamically while the HRPWM is in operation.

TMS320F28076, TMS320F28075

SPRS902J – OCTOBER 2014 – REVISED FEBRUARY 2021

www.ti.com

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