TMS320F2808 Datasheet, PDF (100/123 Pages) Texas Instruments – Digital Signal Processors

TMS320F2808, TMS320F2806
TMS320F2801, UCD9501
Digital Signal Processors
SPRS230F – OCTOBER 2003 – REVISED SEPTEMBER 2005
www.ti.com
Table 6-23 shows the high-resolution PWM switching characteristics.
Table 6-23. High Resolution PWM Characteristics at SYSCLKOUT = (60 - 100 MHz)
Micro Edge Positioning (MEP) step size⁽¹⁾
MIN
TYP MAX UNIT
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.
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
t_w(CAP)
Capture input pulse width
Asynchronous
Synchronous
With input qualifier
(1) For an explanation of the input qualifier parameters, see Table 6-13.
MIN
2t_c(SCO)
2t_c(SCO)
1t_c(SCO) + t_w(IQSW)
Table 6-25. eCAP Switching Characteristics
MAX
UNIT
cycles
cycles
cycles
t_w(APWM)
PARAMETER
Pulse duration, APWMx output high/low
TEST CONDITIONS
MIN
MAX UNIT
20
ns
Table 6-26 shows the eQEP timing requirement and Table 6-27 shows the eQEP switching character-
istics.
Table 6-26. Enhanced Quadrature Encoder Pulse (eQEP) Timing Requirements⁽¹⁾
TEST CONDITIONS
t_w(QEPP)
QEP input period
Asynchronous/synchronous
With input qualifier
t_w(INDEXH)
QEP Index Input High time
Asynchronous/synchronous
With input qualifier
t_w(INDEXL)
QEP Index Input Low time
Asynchronous/synchronous
With input qualifier
t_w(STROBH)
QEP Strobe High time
Asynchronous/synchronous
With input qualifier
t_w(STROBL)
QEP Strobe Input Low time
Asynchronous/synchronous
With input qualifier
(1) For an explanation of the input qualifier parameters, see Table 6-13.
MIN
2t_c(SCO)
2(1t_c(SCO) + t_w(IQSW))
2t_c(SCO)
2t_c(SCO) +t_w(IQSW)
2t_c(SCO)
2t_c(SCO) + t_w(IQSW)
2t_c(SCO)
2t_c(SCO) + t_w(IQSW)
2t_c(SCO)
2t_c(SCO) +t_w(IQSW)
MAX
UNIT
cycles
cycles
cycles
cycles
cycles
cycles
cycles
cycles
cycles
cycles
100 Electrical Specifications