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| AM1808_11 Datasheet, PDF (236/265 Pages) Texas Instruments – AM1808 ARM Microprocessor | |||
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AM1808
SPRS653B â FEBRUARY 2010 â REVISED APRIL 2011
5.29.3 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 5-79. PWM Hi-Z Characteristics
Table 5-128. 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 5-129 shows the high-resolution PWM switching characteristics.
Table 5-129. High Resolution PWM Characteristics at SYSCLKOUT = (60 - 100 MHz)
PARAMETER
Micro Edge Positioning (MEP) step size(1)
1.3V, 1.2V
1.1V
1.0V
UNIT
MIN TYP MAX MIN
TYP MAX MIN TYP MAX
200
200
200
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.
236 Peripheral Information and Electrical Specifications
Copyright © 2010â2011, Texas Instruments Incorporated
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