PWM
(A)
TZ
t
w(TZ)
t
d(TZ_PWM)HZ
OMAP-L137
SPRS563G – SEPTEMBER 2008 – REVISED JUNE 2014
www.ti.com
6.20.1 Enhanced Pulse Width Modulator (eHRPWM) Timing
PWM refers to PWM outputs on eHRPWM1-6.
Table 6-79
shows the PWM timing requirements and
Table 6-80
, switching characteristics.
Table 6-79. eHRPWM Timing Requirements
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
t
w(SYNCIN)
Sync input pulse width
Asynchronous
2t
c(SCO)
cycles
Synchronous
2t
c(SCO)
cycles
Table 6-80. eHRPWM Switching Characteristics
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
t
w(PWM)
Pulse duration, PWMx output high/low
20
ns
t
w(SYNCOUT)
Sync output pulse width
8t
c(SCO)
cycles
t
d(PWM)TZA
Delay time, trip input active to PWM forced high
no pin load;
25
ns
Delay time, trip input active to PWM forced low
no additional
programmable delay
t
d(TZ-PWM)HZ
Delay time, trip input active to PWM Hi-Z
no additional
20
ns
programmable delay
6.20.2 Trip-Zone Input Timing
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
Table 6-81. Trip-Zone input Timing Requirements
PARAMETER
MIN
MAX
UNIT
t
w(TZ)
Pulse duration, TZx input low
Asynchronous
1t
c(SCO)
cycles
Synchronous
2t
c(SCO)
cycles
Table 6-82
shows the high-resolution PWM switching characteristics.
Table 6-82. High Resolution PWM Characteristics at SYSCLKOUT = (60 - 100 MHz)
PARAMETER
MIN
TYP
MAX
UNIT
Micro Edge Positioning (MEP) step size
(1)
200
ps
(1)
MEP step size will increase with low voltage and high temperature and decrease with high voltage and cold temperature.
156
Peripheral Information and Electrical Specifications
Copyright © 2008–2014, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Links:
OMAP-L137
Summary of Contents for OMAP-L137 EVM
Page 221: ......