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| AM1808 Datasheet, PDF (238/264 Pages) Texas Instruments – AM1808 ARM Microprocessor | |||
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AM1808
SPRS653 â FEBRUARY 2010
6.29.2 Trip-Zone Input Timing
TZ
tw(TZ)
www.ti.com
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 6-79. PWM Hi-Z Characteristics
Table 6-128. Trip-Zone input Timing Requirements
tw(TZ)
PARAMETER
Pulse duration, TZx input low
TEST CONDITIONS
Asynchronous
Synchronous
1.3V, 1.2V, 1.1V, 1.0V
MIN
MAX
1tc(SCO)
2tc(SCO)
UNIT
cycles
cycles
Table 6-129 shows the high-resolution PWM switching characteristics.
Table 6-129. High Resolution PWM Characteristics at SYSCLKOUT = (60 - 100 MHz)
PARAMETER
1.3V, 1.2V
1.1V
1.0V
Micro Edge Positioning (MEP) step size(1)
MIN TYP MAX MIN
200
TYP
TBD
MAX MIN
TYP MAX UNIT
TBD
ps
(1) MEP step size will increase with low voltage and high temperature and decrease with high 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.
238 Peripheral Information and Electrical Specifications
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