Datasheet

TMS320F28030, TMS320F28031, TMS320F28032
TMS320F28033, TMS320F28034, TMS320F28035
SPRS584J –APRIL 2009–REVISED OCTOBER 2013 www.ti.com
6.11.3 High-Resolution PWM (HRPWM) Timing
Table 6-22 shows the high-resolution PWM switching characteristics.
Table 6-22. High-Resolution PWM Characteristics
(1)
MIN TYP MAX UNIT
Micro Edge Positioning (MEP) step size
(2)
150 310 ps
(1) The HRPWM operates at a minimum SYSCLKOUT frequency of 60 MHz.
(2) 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
SYSCLKOUT period dynamically while the HRPWM is in operation.
6.11.4 Enhanced Capture (eCAP) Timing
Table 6-23 shows the eCAP timing requirement and Table 6-24 shows the eCAP switching characteristics.
Table 6-23. Enhanced Capture (eCAP) Timing Requirement
(1)
TEST CONDITIONS MIN MAX UNIT
t
w(CAP)
Capture input pulse width Asynchronous 2t
c(SCO)
cycles
Synchronous 2t
c(SCO)
cycles
With input qualifier 1t
c(SCO)
+ t
w(IQSW)
cycles
(1) For an explanation of the input qualifier parameters, see Table 6-12.
Table 6-24. eCAP Switching Characteristics
over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN MAX UNIT
t
w(APWM)
Pulse duration, APWMx output high/low 20 ns
6.11.5 High-Resolution Capture (HRCAP) Timing
Table 6-25. High-Resolution Capture (HRCAP) Timing Requirements
MIN NOM MAX UNIT
t
c(HCCAPCLK)
Cycle time, HRCAP capture clock 8.333 10.204 ns
t
w(HRCAP)
Pulse width, HRCAP capture 7t
c(HCCAPCLK)
(1)
ns
HRCAP step size
(2)
300 ps
(1) The listed minimum pulse width does not take into account the limitation that all relevant HCCAP registers must be read and RISE/FALL
event flags cleared within the pulse width to ensure valid capture data.
(2) HRCAP step size will increase with low voltage and high temperature and decrease with high voltage and low temperature. Applications
that use the HRCAP in high-resolution mode should use the HRCAP calibration functions to dynamically calibrate for varying operating
conditions.
126 Electrical Specifications Copyright © 2009–2013, Texas Instruments Incorporated
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