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| OMAP-L138 Datasheet, PDF (231/255 Pages) Texas Instruments – OMAP-L138 Low-Power Applications Processor | |||
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6.28.2 Trip-Zone Input Timing
TZ
OMAP-L138 Low-Power Applications Processor
SPRS586 â JUNE 2009
tw(TZ)
td(TZ-PWM)HZ
PWM(A)
A. PWM refers to all the PWM pins in the device. The state of the PWM pins after TZ is taken high depends on the PWM
recovery software.
Figure 6-80. PWM Hi-Z Characteristics
tw(TZ)
Table 6-121. Trip-Zone input Timing Requirements
PARAMETER
Pulse duration, TZx input low
TEST CONDITIONS
Asynchronous
Synchronous
1.2V, 1.1V, 1.0V
MIN
MAX
1tc(SCO)
2tc(SCO)
UNIT
cycles
cycles
Table 6-122 shows the high-resolution PWM switching characteristics.
Table 6-122. High Resolution PWM Characteristics at SYSCLKOUT = (60 - 100 MHz)
PARAMETER
Micro Edge Positioning (MEP) step size(1)
1.2V
1.1V
1.0V
MIN TYP MAX MIN
TYP MAX MIN TYP MAX UNIT
200
TBD
TBD
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.
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Peripheral Information and Electrical Specifications 231
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