Datasheet

ADCSOCAO
ADCSOCBO
or
t
w(ADCSOCL)
TMS320F28027, TMS320F28026, TMS320F28023, TMS320F28022
TMS320F28021, TMS320F28020, TMS320F280200
SPRS523J –NOVEMBER 2008–REVISED OCTOBER 2013 www.ti.com
6.11.3 High-Resolution PWM (HRPWM) Timing
Table 6-26 shows the high-resolution PWM switching characteristics.
Table 6-26. High-Resolution PWM Characteristics at SYSCLKOUT = 50 MHz
(1)
–60 MHz
MIN TYP MAX UNIT
Micro Edge Positioning (MEP) step size
(2)
150 310 ps
(1) The HRPWM operates at a minimum SYSCLKOUT frequency of 50 MHz. Below 50 MHz, with device process variation, the MEP step
size may decrease under cold temperature and high core voltage conditions to such a point that 255 MEP steps will not span an entire
SYSCLKOUT cycle.
(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 6-27 shows the eCAP timing requirement and Table 6-28 shows the eCAP switching characteristics.
Table 6-27. 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 6-16.
Table 6-28. 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 ADC Start-of-Conversion Timing
Table 6-29. External ADC Start-of-Conversion Switching Characteristics
over recommended operating conditions (unless otherwise noted)
PARAMETER MIN MAX UNIT
t
w(ADCSOCL)
Pulse duration, ADCSOCxO low 32t
c(HCO )
cycles
Figure 6-18. ADCSOCAO or ADCSOCBO Timing
102 Electrical Specifications Copyright © 2008–2013, Texas Instruments Incorporated
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