Texas Instruments TMS320F2802 User Manual
Page 116

SPRS230N – OCTOBER 2003 – REVISED MAY 2012
shows the high-resolution PWM switching characteristics.
Table 6-25. High-Resolution PWM Characteristics at SYSCLKOUT = 60–100 MHz
MIN
TYP
MAX
UNIT
Micro Edge Positioning (MEP) step size
(1)
150
310
ps
(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.
shows the eCAP timing requirement and
shows the eCAP switching characteristics.
Table 6-26. 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)
With input qualifier
1t
c(SCO)
+ t
w(IQSW)
(1)
For an explanation of the input qualifier parameters, see
Table 6-27. eCAP Switching Characteristics
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
t
w(APWM)
Pulse duration, APWMx output high/low
20
ns
shows the eQEP timing requirement and
shows the eQEP switching
characteristics.
Table 6-28. Enhanced Quadrature Encoder Pulse (eQEP) Timing Requirements
(1)
TEST CONDITIONS
MIN
MAX
UNIT
t
w(QEPP)
QEP input period
Asynchronous
(2)
/synchronous
2t
c(SCO)
cycles
With input qualifier
2[1t
c(SCO)
+ t
w(IQSW)
]
t
w(INDEXH)
QEP Index Input High time
Asynchronous
(2)
/synchronous
2t
c(SCO)
cycles
With input qualifier
2t
c(SCO)
+t
w(IQSW)
t
w(INDEXL)
QEP Index Input Low time
Asynchronous
(2)
/synchronous
2t
c(SCO)
cycles
With input qualifier
2t
c(SCO)
+ t
w(IQSW)
t
w(STROBH)
QEP Strobe High time
Asynchronous
(2)
/synchronous
2t
c(SCO)
cycles
With input qualifier
2t
c(SCO)
+ t
w(IQSW)
t
w(STROBL)
QEP Strobe Input Low time
Asynchronous
(2)
/synchronous
2t
c(SCO)
cycles
With input qualifier
2t
c(SCO)
+t
w(IQSW)
(1)
For an explanation of the input qualifier parameters, see
(2)
Refer to the TMS320F280x, TMS320C280x, and TMS320F2801x DSC Silicon Errata (literature number
) for limitations in the
asynchronous mode.
Table 6-29. eQEP Switching Characteristics
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
t
d(CNTR)xin
Delay time, external clock to counter increment
4t
c(SCO)
cycles
t
d(PCS-OUT)QEP
Delay time, QEP input edge to position compare sync output
6t
c(SCO)
cycles
116
Electrical Specifications
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