TMS320F28027, TMS320F28027-Q1, TMS320F28027F, TMS320F28027F-Q1, TMS320F28026
TMS320F28026-Q1, TMS320F28026F, TMS320F28026F-Q1, TMS320F28023
TMS320F28023-Q1, TMS320F28022, TMS320F28021, TMS320F28020, TMS320F280200
ZHCSA13P –NOVEMBER 2008 –REVISED FEBRUARY 2021
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9.9.7 High-Resolution PWM (HRPWM)
This module 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 is one HR delay line.
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 and
Phase registers of the ePWM module.
• HRPWM capabilities, when available on a particular device, are offered only on the A signal path of an
ePWM module (that is, on the EPWMxA output). EPWMxB output has conventional PWM capabilities.
备注
The minimum SYSCLKOUT frequency allowed for HRPWM is 50 MHz.
备注
When dual-edge high-resolution is enabled (high-resolution period mode), the PWMxB output is not
available for use.
9.9.7.1 HRPWM 电气数据/时序
节9.9.7.1.1 显示了高分辨率PWM 的开关特性。
9.9.7.1.1 SYSCLKOUT = 50MHz–60MHz 下的高分辨率PWM 特性
参数(1)
最小值 典型值 最大值 单位
微边沿定位(MEP) 步长(2)
150
310
ps
(1) HRPWM 运行在一个最少50MHz 的SYSCLKOUT 频率上。低于50MHz，在器件过程变化时，MEP 阶跃尺寸有可能下降至低于冷却温
度并且高内核电压达到一个要求的值以至于255 MEP 阶跃将不能跨过整个SYSCLKOUT 周期。
(2) 在高温和VDD 上的电压最低时，MEP 步长将达到最大。MEP 步长会随温度升高和电压降低而增加，同时随温度降低和电压升高而减
小。
使用HRPWM 特性的应用应该使用MEP 比例因子优化器(SFO) 估计软件功能。有关在最终应用中使用SFO 函数的详细信息，请参阅
TI 软件库。SFO 函数有助于在HRPWM 运行时动态地估计每个SYSCLKOUT 周期内的MEP 步数量。
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