AM1707 Datasheet, PDF (134/198 Pages) Texas Instruments – AM1707 ARM Microprocessor

AM1707
SPRS637 – FEBRUARY 2010
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6.21.1 Enhanced Pulse Width Modulator (eHRPWM) Timing
PWM refers to PWM outputs on eHRPWM1-6. Table 6-77 shows the PWM timing requirements and
Table 6-78, switching characteristics.
t_w(SYNCIN)
Table 6-77. eHRPWM Timing Requirements
PARAMETER
Sync input pulse width
TEST CONDITIONS
Asynchronous
Synchronous
MIN
2t_c(SCO)
2t_c(SCO)
MAX
UNIT
cycles
cycles
t_w(PWM)
t_w(SYNCOUT)
t_d(PWM)TZA
t_d(TZ-PWM)HZ
Table 6-78. eHRPWM Switching Characteristics
PARAMETER
TEST CONDITIONS
Pulse duration, PWMx output high/low
Sync output pulse width
Delay time, trip input active to PWM forced high no pin load; no additional
Delay time, trip input active to PWM forced low programmable delay
Delay time, trip input active to PWM Hi-Z
no additional programmable
delay
MIN
20
8t_c(SCO)
MAX
25
20
UNIT
ns
cycles
ns
ns
6.21.2 Trip-Zone Input Timing
t_w(TZ)
TZ
t_d(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 6-46. PWM Hi-Z Characteristics
t_w(TZ)
Table 6-79. Trip-Zone input Timing Requirements
PARAMETER
Pulse duration, TZx input low
Asynchronous
Synchronous
MIN
1t_c(SCO)
2t_c(SCO)
MAX
Table 6-80 shows the high-resolution PWM switching characteristics.
Table 6-80. High Resolution PWM Characteristics at SYSCLKOUT = (60 - 100 MHz)
PARAMETER
Micro Edge Positioning (MEP) step size⁽¹⁾
MIN
TYP
MAX
200
(1) MEP step size will increase with low voltage and high temperature and decrease with high voltage and cold temperature.
UNIT
cycle
s
cycle
s
UNIT
ps
134 Peripheral Information and Electrical Specifications
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