Datasheet

TMS320C28346, TMS320C28345, TMS320C28344
TMS320C28343, TMS320C28342, TMS320C28341
www.ti.com SPRS516D –MARCH 2009–REVISED AUGUST 2012
6.11.3 High-Resolution PWM Timing
Table 6-22 shows the high-resolution PWM switching characteristics.
Table 6-22. High-Resolution PWM Characteristics at SYSCLKOUT = (150–300 MHz)
MIN TYP MAX UNIT
Micro Edge Positioning (MEP) step size
(1)
V
DD
= 1.2 V 55 120 ps
V
DD
= 1.1 V 65 140 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.
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 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 6-12.
Table 6-24. eCAP Switching Characteristics
PARAMETER TEST CONDITIONS MIN MAX UNIT
t
w(APWM)
Pulse duration, APWMx output high/low 20 ns
Copyright © 2009–2012, Texas Instruments Incorporated Electrical Specifications 129
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