TMS320F28035_13 Datasheet, PDF (124/157 Pages) Texas Instruments – Piccolo Microcontrollers

TMS320F28030, TMS320F28031, TMS320F28032
TMS320F28033, TMS320F28034, TMS320F28035
SPRS584I – APRIL 2009 – REVISED JULY 2012
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⁾
Micro Edge Positioning (MEP) step size⁽²⁾
MIN
TYP MAX UNIT
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 maximum 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
t_w(CAP)
Capture input pulse width
Asynchronous
Synchronous
With input qualifier
(1) For an explanation of the input qualifier parameters, see Table 6-12.
MIN
2t_c(SCO)
2t_c(SCO)
1t_c(SCO) + t_w(IQSW)
MAX
UNIT
cycles
cycles
cycles
Table 6-24. eCAP Switching Characteristics
over recommended operating conditions (unless otherwise noted)
PARAMETER
TEST CONDITIONS
t_w(APWM)
Pulse duration, APWMx output high/low
MIN
MAX UNIT
20
ns
6.11.5 High-Resolution Capture (HRCAP) Timing
Table 6-25. High-Resolution Capture (HRCAP) Timing Requirements
t_c(HCCAPCLK)
t_w(HRCAP)
Cycle time, HRCAP capture clock
Pulse width, HRCAP capture
HRCAP step size⁽²⁾
MIN
8.333
7t_c(HCCAPCLK) ⁽¹⁾
NOM
300
MAX
10.204
UNIT
ns
ns
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.
124 Electrical Specifications
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