Datasheet

129

TMS320F28379S

TMS320F28377S

TMS320F28376S, TMS320F28375S, TMS320F28374S

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SPRS881C –AUGUST 2014–REVISED MAY 2016

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(1) Maximum MEP step size is based on worst-case process, maximum temperature and minimum voltage. MEP step size will increase

with low voltage and high temperature and decrease with voltage and cold temperature.

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.

5.9.4 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.

5.9.4.1 HRPWM Electrical Data and Timing

Table 5-65 lists the high-resolution PWM switching characteristics.

Table 5-65. High-Resolution PWM Characteristics

PARAMETER MIN TYP MAX UNIT

Micro Edge Positioning (MEP) step size

(1)

150 310 ps