TMS320F28335, TMS320F28334, TMS320F28332
TMS320F28235, TMS320F28234, TMS320F28232
SPRS439I–JUNE 2007–REVISED MARCH 2011
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Table 6-23 shows the high-resolution PWM switching characteristics.
Table 6-23. High-Resolution PWM Characteristics at SYSCLKOUT = (60 –150 MHz)
MIN
TYP
MAX UNIT
310 ps
Micro Edge Positioning (MEP) step size(1)
150
(1) 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.
6.10.3 Enhanced Capture (eCAP) Timing
Table 6-24 shows the eCAP timing requirement and Table 6-25 shows the eCAP switching characteristics.
Table 6-24. Enhanced Capture (eCAP) Timing Requirement(1)
TEST CONDITIONS
Asynchronous
MIN
2tc(SCO)
MAX UNIT
cycles
tw(CAP)
Capture input pulse width
Synchronous
2tc(SCO)
cycles
With input qualifier
1tc(SCO) + tw(IQSW)
cycles
(1) For an explanation of the input qualifier parameters, see Table 6-13.
Table 6-25. eCAP Switching Characteristics
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
tw(APWM)
Pulse duration, APWMx output high/low
20
ns
6.10.4 Enhanced Quadrature Encoder Pulse (eQEP) Timing
Table 6-26 shows the eQEP timing requirement and Table 6-27 shows the eQEP switching
characteristics.
Table 6-26. Enhanced Quadrature Encoder Pulse (eQEP) Timing Requirements(1)
TEST CONDITIONS
Asynchronous/synchronous
With input qualifier
MIN
MAX
UNIT
cycles
cycles
cycles
cycles
cycles
cycles
cycles
cycles
cycles
cycles
tw(QEPP)
QEP input period
2tc(SCO)
2[1tc(SCO) + tw(IQSW)
]
tw(INDEXH)
tw(INDEXL)
tw(STROBH)
tw(STROBL)
QEP Index Input High time
QEP Index Input Low time
QEP Strobe High time
QEP Strobe Input Low time
Asynchronous/synchronous
With input qualifier
2tc(SCO)
2tc(SCO) + tw(IQSW)
2tc(SCO)
Asynchronous/synchronous
With input qualifier
2tc(SCO) + tw(IQSW)
2tc(SCO)
2tc(SCO) + tw(IQSW)
2tc(SCO)
Asynchronous/synchronous
With input qualifier
Asynchronous/synchronous
With input qualifier
2tc(SCO) + tw(IQSW)
(1) For an explanation of the input qualifier parameters, see Table 6-13.
Table 6-27. eQEP Switching Characteristics
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
cycles
cycles
td(CNTR)xin
Delay time, external clock to counter increment
4tc(SCO)
6tc(SCO)
td(PCS-OUT)QEP
Delay time, QEP input edge to position compare sync
output
140
Electrical Specifications
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