PWM
(B)
TZ
XCLKOUT
(A)
t
w(TZ)
t
d(TZ-PWM)HZ
TMS320F2809, TMS320F2808, TMS320F2806
TMS320F2802, TMS320F2801, TMS320C2802
TMS320C2801, TMS320F28016, TMS320F28015
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SPRS230N – OCTOBER 2003 – REVISED MAY 2012
6.10 Enhanced Control Peripherals
6.10.1 Enhanced Pulse Width Modulator (ePWM) Timing
PWM refers to PWM outputs on ePWM1–6.
Table 6-22
shows the PWM timing requirements and
Table 6-
23
, switching characteristics.
Table 6-22. ePWM Timing Requirements
(1)
TEST CONDITIONS
MIN
MAX
UNIT
t
w(SYCIN)
Sync input pulse width
Asynchronous
2t
c(SCO)
cycles
Synchronous
2t
c(SCO)
cycles
With input qualifier
1t
c(SCO)
+ t
w(IQSW)
cycles
(1)
For an explanation of the input qualifier parameters, see
Table 6-15
.
Table 6-23. ePWM 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
t
d(TZ-PWM)HZ
Delay time, trip input active to PWM Hi-Z
20
ns
6.10.2 Trip-Zone Input Timing
A.
TZ: TZ1, TZ2, TZ3, TZ4, TZ5, TZ6
B.
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 6-17. PWM Hi-Z Characteristics
Table 6-24. Trip-Zone input Timing Requirements
(1)
MIN
MAX
UNIT
t
w(TZ)
Pulse duration, TZx input low
Asynchronous
1t
c(SCO)
cycles
Synchronous
2t
c(SCO)
cycles
With input qualifier
1t
c(SCO)
+ t
w(IQSW)
cycles
(1)
For an explanation of the input qualifier parameters, see
Table 6-15
.
Copyright © 2003–2012, Texas Instruments Incorporated
Electrical Specifications
115
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